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Telos TWO User's Manual, Version 1.0

1. 2 eor o eoru onu unn uunuunuuuuuuuuuuuuuuuan 31 2 7 2 Super Auto Answer compatible ports c eroe nennen nuu unauuauuuuuuu uua 34 2 7 3 RS 232 Serial Remote Control c erre oru u uan unauuauuuuuuuuuauuuu uuu uuRuS 36 2 7 4 Ethernet Remote Control eee o rre a uua uuauuuauuauuuuuuuuuauuuuuaRuuaRRRRRSRUS 36 2 8 System Setup amp Testing c eere eene nan unnuuauuuuuuauuauuuuuuRRuRRRRRSSESERSESESEERSRHERE 37 2 8 1 Is the ISDN working ccccccsccccccccccccnccccccecnnnceccencenceccesceesesnencenseccccccccccccecnes 37 2 8 2 Levels Levels Levels iidiiccistdndsavcnctescuctucdssisuanduansseuanatnecsvisucieudesddnanastuenauesas 39 2 8 3 Tame TO Test It OUT siesadsansinaveunsccawsdasdaussnnwiwewsacuvacdsuaucdasdeuccuueusuurausuaneuadauauwus 40 3 1 Making and Accepting Calls ecce eere rr eren enun enun unu nnn unu unu un uun 44 Selecting LIBGS ssuciueeidus auus a VENE RWENEEE RRERENNEREER RUN RENE EN ERENEEN UE VRENERERNE ai eaaa AEA 44 Marn al DIalll giiisscusatE uz ERERUS RENEHERNNNRUPAENEKEEEEAME RN ERE NN NE SEEN EVE E KE ERR RO RN EN VE MEERNNEKEIEKE ENFIN CHR 44 TABLE OF CONTENTS Vi Memory Dialing os ceacix d hi a RERO DEDE RT RD RR TR ERG RR RR RD LR 45 Dropping GCallsicissixeuusuuandddu a duMa d aHa KaENER INN EAR MREEHEREE MEME CE RR UN UE NNEEVEN UEM NEN HMM RENE CER 46 Holding amp Resuming CANS nau a nuu a wuF RS E
2. 1 Press the Line 1 button to select that line for dialing 2 Enter the phone number for the line you wish to call and press Send 3 Bring up hybrid 1 on the console You will hear the audio from the phone line 4 Puton some headphones bring up the microphone and greet the far end party 5 Your voice should sound normal in your headphones without any tinny or hollow artifacts and the caller should sound clear 6 Drop the call by pushing the Line 1 button and then pressing Drop 7 Repeat steps 1 through six using Line 2 What now Your basic installation is complete Next you will want to look over section 3 of this manual and decide how to set up the following parameters CHAPTER 2 Receive EQ AGC amp Noise Gate See section 3 6 Duplex Level caller ducking See section 3 6 Feedback Control when using open speakers See section 3 6 Send EQ AGC See section 3 6 Internal Audio Routing See section 3 4 1 41 INSTALLATION CHAPTER 2 TELOS TWO USER S MANUAL Remote Control Options INSTALLATION See section 3 5 1 42 TELOS TWO USER S MANUAL 3 Operation After power up and initialization the following status screen appears V 1 0 2000 01 04 When you see this screen and if the ISDN line is connected and functioning correctly and the TWO s configuration settings have been adjusted to the requirements of your installation then the TWO is ready for you to make and receive calls You may con
3. IMPORTANT Users in the USA amp Canada should see READY READY status whenever the system is idle On certain ETS 300 ISDN lines the system will go from READY READY to DEACTIVATED DEACTIVATED after an idle period This is no cause for alarm and you can proceed with the following steps Once you see READY READY on the ISDN Status screen we can proceed to make a call and verify that the ISDN is in fact working We will start out with the simplest case a call from your line 1 to your line 2 as follows e Press the Line 1 button to select that line for dialing e Enter the phone number for line 2 using the numeric keypad and press Send to place the call e If your line has 2 channels with the same phone number just use that number e If your line only has one active channel you will need to enter some other phone number e You should hear a chime sound as line 2 is answered If the autoanswer function is not on you will ringing sound and a display indicating you have a pending call You must then press the line 2 button to answer e fthis happens your ISDN is working If this does not happen see section 4 for information on troubleshooting your problem CHAPTER 2 38 INSTALLATION TELOS TWO USER S MANUAL e If you do not plan on proceeding to the next section and setting your levels now push the Line button now and then press the Drop button now HOT TIP Many phone lines have per minute usage cha
4. 1 If that fails Try DMS Cust If you were given 2 SPIDs with the format area code 7 digit phone 1 digit for example 1 or 0 try DMS Cust If this fails try Natl I 1 If you were given 2 SPIDs with the format area code 7digit phone 2 digits for example 01 11 02 or 00 try DMS Cust If that fails try Natl I 1 If you were given 2 SPIDs with the format area code 7digit phone 3 digits for example 000 001 try Natl I 1 If that fails try DMS Cust If you were given a single phone number and a single SPID with the format of 0147 digit phone 0 try AT amp T Cust If you were given a single phone number and a single SPID with the format of 0147 digit phone 00 try Natl I 1 If you were given a single phone number and a single SPID with the format of area code 7digit phone 4digits for example 0101 0100 0111 or 1111 Try Natl I L If that fails try DMS Cust IMPORTANT After you enter or change your SPIDs or DNs you must restart the system to use the new information Therefore once you have entered SPID1 SPID2 DNI and DN2 you should turn the power off and then back on Then go to the ISDN status screen and verify Ready status for both channels CHAPTER 3 66 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL 3 4 3 The System Menu Contrast 12 Backlight 20 Click Volume 5 I Ring Volume 101 Contrast Adjusts the contrast of the LCD It takes values between 0 and 20 The
5. Enter the numbers using the dial pad Both and will give you a period 72 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL As usual the key will backspace if you make a mistake or need to delete an old entry Gateway This is the IP address of a gateway router connecting you to the internet It is an IP address just as with the previous two items and is entered in the same way You will need to get this from your network administrator or internet service provider DNS IP This is the IP address of the DNS Domain Name Server you will be using It is an IP address just as with the previous items and is entered in the same way You will need to get this from your network administrator or internet service provider Trusted This is an IP address or a valid alphanumeric internet domain When the Remote Ctrl selection in the System menu is set to RS232 trust the system will allow telnet and FTP connections from this trusted domain and Telos Technical Support only ooftware Update Selecting the J will return you to the System menu Selecting this option displays the Update Software sub menu with the following options Update Software FTPsite ftp zephyr com Boot Bank Primary Update software Commit software FTPsite This 1s the site from which new software will be downloaded Normally the default value should be used unless you are instructed to do otherwise by Telos technical support Boot B
6. If you do not have the proper connectivity to handle the electronic download method contact Technical Support to request a flash SIMM be sent with the desired firmware Then follow the steps in the next section to replace the SIMM module To upgrade your unit using the electronic download method you will need the following Ethernet connection to the TWO from a LAN connected to the internet The Remote Cntrl selection of the System menu must be set to All or Trusted The TWO must be programmed with the following information see Section 3 4 3 for details IP Addr This is the IP address for this TWO As with any computer on an IP network the TWO must have an IP address before it can be used over the network Subnet This is your subnet mask The subnet mask is to determine the size of your local network All packets addressed to a destination outside this local area are sent to the gateway node entered in the next selection Gateway This 1s the IP address of a gateway router connecting you to the internet DNS IP This 1s the IP address of the DNS Domain Name Server you will be using For complete instructions on upgrading your system software see section 3 4 3 Manual Replacement Method The system s firmware is contained within a flash memory SIMM module similar in size and form to those used for PC memory If you need to change this module follow the procedure below 1 Power TWO off and remove the AC mains
7. amp Canada should see the previous section e Press the TEL button You will see a screen which looks like the following EE ISDN Settings 22 Auto Answer Off SPIDI none SPID2 none DNI none e f your ISDN setup requires SPIDs all but AT amp T Custom PTP do scroll down using the button until SPIDI is highlighted with a dark bar e Press the Select button and enter your first SPID using the numeric keypad Push Select again to confirm ISDN TIP 1 Incorrectly entered SPIDs are the most common problem users in the USA amp Canada have placing ISDN calls Compare the SPIDs you have entered with the SPIDs provided to you by the phone company to be certain that you have entered them correctly Do not add anything to your SPIDs 2 Note that there are no hyphens or dashes or spaces in SPIDs so the system will not allow you to enter any non numeric characters If your installer has included them in the SPID ignore them 3 For a list of known working SPIDs listed by Telephone Company see the appendix 4 See section 3 4 2 for numerous tips about SPIDs and ISDN protocol settings 5 If you have any questions about your SPIDs call your phone company 6 If you have PTP AT amp T Custom Point to Point or ETS300 Euro ISDN Telco mode you should not enter anything in the SPID fields e Scroll down to SPID2 using the button and repeat the last step e Scroll down using the button until you h
8. amp DETAILED REFERENCE TELOS TWO USER S MANUAL Receive Automatic Gain Control This AGC serves to improve consistency of caller audio levels This function is very important to effective hybrid performance as caller levels can vary by as much as 30 dB This AGC is an advanced dB linear feed forward topology providing a consistent sound independent of drive level Its smart response normalizes levels while retaining the natural dynamics of the caller s voice An important additional feature of this AGC is that it is cross coupled to other sections of the TWO and can therefore reliably distinguish between caller audio and hybrid leakage This allows a more aggressive gain control for bringing up low level callers while still preserving excellent hybrid performance Noise Gate Turning off the noise gate disables the built in downward expander The downward expander reduces low level line noise when no caller audio is present and reduces low level leakage thereby improving hybrid performance This function is cross coupled with the AGCs and the duplex system Default is On Digital Dynamic Equalizer Receive EQ Telephone audio frequency response varies widely as many factors can effect it we ve measured the response on a number of calls and the results were revealing Consequently some form of receive equalization is desirable See section 3 3 1 for details on the DDEQ system The Digital Dynamic EQ process used on the Telos is t
9. e Gateway IP address e DNS Server IP address CHAPTER 3 81 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL This information is programmed in the TCP IP submenu in the System menu See section 3 4 3 for how to do this You may now Telnet to the IP address of the unit using any Telnet software The same commands as given in section 3 5 1 are available once the Telnet session has been established The system operating software can also be upgraded using the Ethernet port That function is covered in section 4 2 3 6 System Audio Processing and Feedback Control Send Audio Processing The TWO s send audio processing consists of the following functions Sample rate conversion High pass filter Frequency shifter Send equalizer Send AGC Limiter Sample Rate Conversion AES EBU sources are sample rate converted to the TWO s internal sample rate of 48kHz 48Khz sources are reclocked to the system s internal clock derived from the ISDN clock High Pass filter A high pass filter with a 250 Hz crossover frequency improves hybrid performance and enhances intelligibility by removing unnecessary low frequency information from the audio present at the TWO s input This function cannot be defeated Frequency Shifter The frequency shifter pitch shifter inserts a small unnoticeable shift in frequency to the send audio to prevent feedback buildup when the system is used with open speakers See below for addit
10. law in Europe This is a scheme that equalizes the step size in dB terms across the dynamic range a smaller step size on low level signals reduces quantization noise and improves effective dynamic range to the equivalent of about 13 bits The Telos TWO automatically uses the appropriate method depending upon the ISDN protocol setting ISDN offers a direct path from your studios to the telephone network extending the digital channels without conversion or modification The benefits are many ISDN Lines are inherently 4 wire Analog lines use a single pair of wires for both signal directions mixing the send and caller audio This causes the leakage problem where the announcer s audio is present on the hybrid output where we desire that there only be caller audio A 4 wire circuit has two wire pairs and therefore two independent audio paths Digital circuits inherently offer independent and separated signal paths because it is not possible to have bits moving in both directions without separating them somehow CHAPTER 1 2 INTRODUCTION TELOS TWO USER S MANUAL Though a digital circuit may today not use wires at all but rather fiber microwave radio or satellite telephone engineers bowing to tradition continue to refer to all separated speech paths as being 4 wire While the application of DSP to the problem of separating the signals used in digital hybrid interfaces such as our earlier products has made
11. IP address or DNS server IP address Name apcommit Description Commit downloaded software from secondary to primary memory bank Name ipfthost Description view set the name of the remote FTP server for software downloads and the name of the file to retrieve Name ipid Description Not for customer use Name ipping Description Ping a remote host given by name or IP address and wait for reply Name 1 Ipfev Description Perform a reverse DNS lookup of an IP address Name iptelnet Description Show statistics about connected telnet Sessions or shut down sessions Name iptrusted CHAPTER 3 78 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Description View or set the name of a trusted domain or IP address of a trusted host Name ipupdate Description Perform a software download into the secondary bank Name isdncall Parameter number Description Make ISDN call with given number Name lcdback Parameter 0 0x7F Description Set LCD backlight brightness O off Name lcdcontr Parameter 0 0x7F Description Set LCD contrast O0 low SHIT a are E t log Parameter 1 dbg ext isdn il12 il3 iie istk all gt 2 lt none gt Description Switch debug printouts on ly sal switches all possible debug printing on add print flags to the exis
12. Rcv Mute The caller audio received from line 2 is muted when the associated input is active Hyb 12 Rcv Mute The caller audio received from both line 1 amp Line 2 is muted when the associated input is active Hybl end Mute The studio audio sent to line 1 is muted when the associated input is active Hyb2 Snd Mute The studio audio sent to line 2 is muted when the associated input is active Hybl2 Snd Mute The studio audio sent to both line 1 and 2 are muted when the associated input is active Hyb Mix Off Hybrid Mix refers to the cross feed audio between the callers Enabling any Routing option except for Separate allows for this cross fed audio in order that the two callers can hear one another This input option is for the rare occasion where you might wish to modify this If HybMix off 1s asserted the caller to caller gain will drop from the previously set value the Hybrid Mix setting in the Audio menu to 12dB If the Hybrid Mix setting was 71 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL already set to 12bB nothing will happen When you stop asserting this input the crossfeed will return to the value set for Hybrid Mix in the Audio menu Hyb Mix On Hybrid Mix refers to the cross feed audio between the callers Enabling any Routing option in the Audio menu except for Separate allows for this cross fed audio in order that the two callers can hear one another This input is for t
13. Some consoles allow this when certain control combinations are selected by the user In some cases it may be as simple a mistake as assigning the hybrid to whichever buss is feeding the hybrid This is the first place to look when strange or erratic performance is experienced The quickest test is to bring up only the hybrid in question on the board and select a line Dial tone should not appear on the send meter of the hybrid in question No Mix minus at all Feed Thru The Special Downstream Mode The Telos TWO may be used downstream of the studio console In this case the hybrid adds the caller to the input and passes the summed result on to the output This method avoids the need for a mix minus feed The TWO s Feed Thru option in the Audio menu see section 3 4 1 is enabled to create this mode CHAPTER 2 25 INSTALLATION TELOS TWO USER S MANUAL All audio is sent into the Two where the caller audio is mixed in The resulting mix is output from the TWO s Output Caller outputs Phones and Remotes To save money and hassle calls are usually received at the studio rather than at the remote site In this situation caller audio must be fed to the remote talent so that they can hear and respond to callers Moreover the callers need to hear the talent In many cases the remotes are sufficiently distant that talent cannot monitor the station for the caller feed Even if they could the profanity delay would be a problem since the
14. This means a very basic kind of problem usually no physical connection Yes you can use a pair of analog headphones to do a basic check You will hear a clicking about once a second or a white noise rushing sound when a line is connected CHAPTER 4 96 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL Condition System says Ready Ready but attempted calls do not complete Can you dial from Line 1 to Line 2 If you can successfully call from one line to the other you know that your SPIDs and ISDN protocol settings are correct and that the ISDN line itself 1s ok Try a call to another local number Check your SPIDs If you cannot complete this call try dialing with a 9 8 7 or 6 before the number Sometimes ISDN lines are set up as Centrex service even if you did not request this If so you can enter this number into the Dial Prefix selection of the Telco menu Is your long distance carrier OK If you can successfully call locally but long distance calls don t go through the Telos TWO usually displays Far end disconnect or No route available as the ISDN Cause phrase You may try another by dialing the appropriate IOXXXXX prefix in the USA amp Canada only In the USA you can determine who your long distance carrier is by dialing 1 700 555 4141 If Intra LATA long distance competition has reached your area you can determine your Intra LATA long distance carrier by dialing 1 area code 700 4141
15. USA amp Canada should skip ahead to USA amp Canada ISDN Setup e Press the TEL button You will see a screen which looks like the following 4 ISDN Settings TN Auto Answer Off SPIDI none SPID2 none DNI none e Using the button scroll down until MSN is highlighted with a dark bar as shown below ISDN Settings SPID2 lt none gt DNI none DN2 none MSNI lt none gt e f your ISDN setup uses MSNs multiple subscriber numbers so other devices can share the line with the TWO press the Select button and enter your first MSN using the numeric keypad Push Select again to confirm e Scroll down to MSN2 using the button and repeat the previous step CHAPTER 2 17 INSTALLATION TELOS TWO USER S MANUAL ISDN TIP NOTE MSNs are not required to make the system work If you will not share this ISDN 2 line SO BRI with other ISDN equipment you may omit entering them e Using the 7 button scroll down until Telco is highlighted with a dark bar as shown below ISDN Settings MSNI none MSN2 none Dial Prefix none Telco ETS300 e Press the Select button Press the button until ETS300 or other appropriate protocol is shown and press the Select button again to confirm e Turn the unit off and back on again to initialize the ISDN protocol connection CHAPTER 2 18 INSTALLATION TELOS TWO USER S MANUAL USA amp Canada ISDN Setup users outside the USA
16. You may choose how much of this effect you prefer from HALF 0 which keeps the system which makes the system operate like a one way at a time speakerphone to FULL 16 which disables ducking A typical value would be in the range of 8 12 for many applications Feedback Control We ve carefully designed the TWO so that problems with feedback should be rare However despite excellent trans hybrid loss and a number of other features you can always induce feedback if you try sufficiently hard i e cranking up your studio monitors Some suggestions for what you should do if feedback occurs are the following Adjust the DuplexLevel selection in the Audio Menu to a lower setting When mic processing is used connect the hybrid in such a way that it gets an unprocessed mic signal Our Cutting Edge Omnia Tool Vox microphone processor has an output just for this purpose CHAPTER 3 85 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL The problem here is that the mic processing combines with the TWO s internal AGC to increase gain in the feedback path Depending on the mic processor used the feedback margin can be reduced by many dB The TWO s internal AGC has a internal adaptive smart gate function to prevent inappropriate gain increase however it is thwarted by this additional processing If it is not possible to get an unprocessed mic signal try to set the mic processor in such a way that room noise is not sucked
17. a dramatic improvement over analog systems ISDN enables yet further improved performance Better Digital Analog Conversion Quality The analog to digital conversion chips used in telephone central offices are poor performers when compared to the converters used in professional audio equipment Fidelity is not an important consideration when most Telco equipment designers choose parts for this function In a professional interface for studio application we can afford to design in much better converters than available in the Telephone Company s equipment Noise shaping functions permit a larger word length converter to provide significantly better distortion and signal to noise performance Since we are handling the conversion we can encode at higher levels without concern about regulations designed to prevent crosstalk on analog lines resulting in improved send to caller levels In all digital installations the Telos TWO facilitates an all digital path AES EBU is included in the unit to accomplish the connection to digital studio gear Lower Noise Because they are digital circuits ISDN lines are not susceptible to induced noise Analog lines are exposed to a variety of noise and impulse trouble causers as they move across town on poles and through your building Hum is the main one given most line s proximity to pole transformers and power lines but there are also sources of impulse noise from motors switches and other sources Digi
18. a single mix minus with neither hybrid s audio present but allows for 2 two mono faders on the console one for each caller This is the most popular option when only one mix minus is available as it allows independent control of the two caller levels at the console MIX MINUS TIP Remember that in section 2 5 1 we discussed a simple mix minus consisting of a feed directly off the mic preamp In that chapter we mentioned the drawback to that approach was the need for external equipment if more than one mic were used If you have only 2 mics you can use that simple approach by feeding the audio from each mic preamp into one of the Studio In inputs and using the Mix Mono Mix Wide or Mix Panned routing options on the TWO Since the two inputs are mixed within the TWO with these settings each caller will hear both mics CHAPTER 3 60 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Hybrid Mix This option allows adjustment of the amount of cross feed of one hybrid s output to the other The range is from 12 to 8 O represents no gain or loss between callers and is the usual setting If you have problems with callers unable to hear each other you should increase this setting slightly The setting of this control makes is ignored if the Routing is set to Separate since that routing option does not cross feed the caller audio Two parallel control input options HybMix On and HybMix Off allow for modification of
19. address incomplete Special intercept announcement This cause indicates that the called party cannot be reached because the called party number is not in a valid format or is not complete Or Special Intercept Announcement should be returned to the calling party Cause No 29 Facility rejected Special Intercept announcement undefined code This cause indicates a facility requested cannot be provided by the network Or This cause indicates that a user in a special business group i e Centrex dialed and undefined code Cause No 30 Result of a STATus ENQuiry Special intercept announcement number unassigned This cause is included in the Status Message when the reason for sending the Status Message was previous receipt of a Status Enquiry message Or This value indicates that a user from outside a basic business group 1 e Centrex has violated an access restriction feature Cause No 31 Network disconnect Normal unspecified Special intercept announcement Call blocked because of group restrictions This cause is used to report a normal event only when no other cause in the normal class applies Or This value indicates that a user from outside a basic business group 1 e Centrex violated an access restriction feature Cause No 34 No circuit available circuit channel congestion This cause indicates that there is no appropriate circuit channel presently available to handle the call CHAPTER 4 102 TE
20. and Terminal Types Any equipment connected to an ISDN line is a terminal whether phone computer or Hybrid Point to point lines support one terminal per circuit while multipoint lines can have up to eight in some applications Terminal Type is a parameter sometimes requested by the phone people The appropriate value for the Hybrid varies depending upon protocol and is included on the order forms IOC Capability Packages provisioning package More and more telcos are using ISDN Ordering Code IOC capability packages for ISDN ordering If your telephone company uses these you need only tell them you need IOC package S and an RJ 11 style jack We still recommend that you fax them these forms as well FAXABLE ISDN ORDER FORMS Following forms should be used to place orders for ISDN lines These should give the phone company all of the information they need The majority of installations if ordered in writing with this information go smoothly If you do experience problems Telos customer support is here to help You may also wish to look at our troubleshooting information in the TWO manual and on our web site at http www telos systems com Complete the top portion of the form and send all three pages to the phone company Keep the form handy and show it to the installer when he or she puts in your line and ask the installer to verify with the switch programmer at the central office that your line is configured
21. as ordered APPENDIX 2 116 ISDN BRI ORDERING GUIDE FOR USA amp CANADA TELOS TWO USER S MANUAL ISDN BRI LINE ORDERING INFORMATION for TELOS TWO USA amp Canada To Telephone Company Attention From Location for line Company Company Address Address City State ZIP City State ZIP Phone Phone Contact Contact Long distance carrier Date needed Termination date We request an ISDN Basic Rate Interface BRI line for use with the Telos TWO digital audio hybrid This device is interface audio equipment to digital telephone services It requires Circuit Switched Voice CSV We may also use this line for other equipment which makes calls using Circuit Switched Data CSD service Please advise us if there is a cost penalty for having both CSD and CSV If you use IOC ISDN Order Code Capability Packages please use Capability Package S If you do not use IOCs use the information on the pages that follow TWO has an integral BRI terminal adapter which supports these protocols see details on following pages AT amp T 5ESS Custom Point to Point 5E4 2 or later National ISDN 1 Northern Telecom Functional PVC1 National ISDN 1 PVC2 Siemens EWSD National ISDN 1 We can use any of the protocols given above Please let us know which protocol you will provide and the switch We will provide the NT1 and need a U interface with 2B1Q line coding on a standard six pin 4 conductor RJ11 style modular jack USOC SJ
22. but which actually is just about to begin ringing and connects to a surprised caller This condition called glare results from the delay in the ring signaling which comes from the nature of the analog line s ringing cadence This is much less likely with ISDN because it eliminates the ambiguous status period CURIOSITY NOTE We don t know why the condition of picking up a line which was about to ring and getting an incoming call instead of dial tone is called Glare Perhaps it s because the looks air staff give engineers when this happens too often If you find out be sure to let us know Higher Gain and Heduced Feedback During Multi line Conferencing When conferencing is required on 2 wire circuits very good hybrids are needed to separate the two audio paths in order to add gain in each direction When the gain around the loop exceeds unity there is the possibility of feedback singing Since the conference path usually includes four AGC functions the hybrid must be sufficiently good to cover the additional gain that may be dynamically inserted Because of the 4 wire nature of ISDN the hybrid function is more effective and more reliably so across a variety of calls That means more gain can be inserted between calls before feedback becomes a problem Line Monitoring Since there is a full time connection between the central office and the terminal on the D channel it is possible to detect when a line is not working O
23. call to call on a given line This wide variation requires a careful approach to audio leveling We use an AGC that maintains a constant compression ratio regardless of average gain reduction in order to produce consistency in the caller audio Freeze gating 1s also important so that gain does not increase during caller speech pauses Digital Dynamic Equalization The Telos 100 Delta analog hybrid interface has included for some time the Digital Dynamic EQ DDEQ feature that balances the frequency spectrum of caller audio We include this also in the Telos TWO Because telephone sets have a variety of microphone characteristics this function helps caller audio to have a reasonable spectral consistency which has proven valuable in the real world We include a three band dynamic equalization processor which has the right trade off of enough correcting power without creating undesired audible shifting of frequency characteristics Caller Ducking This is an aesthetic requirement of many talk hosts This functions to reduces the level of the caller when the host talks allowing her an automatic control over a caller who wants to carry on This is a matter of taste some talents and programmers prefer no ducking so that hosts and callers can conduct heated exchanges without impediment while others want to exercise control The Telos TWO has this function along with a control that can adjust the effect to the desired amount of calle
24. dial Verify this before you attempt to dial a system you are trouble shooting The symptoms after you dial will be irrelevant if the system is not at Ready Ready when you attempt to dial NOTE There is one exception to the above if you are using ETS 300 it may be normal for the system to leave the Ready Ready state and show Deactivated Deactivated The most important tool is the TWO s integrated ISDN analyzer This enables you to look at the transactions between the Telco line and the TWO so that a judgment can be made as to whether the problem lies within the TWO or with the telephone service See Section 3 4 1 for details on using this over the serial port Normally you ll need to send the analyzer output to Telos Customer Support for analysis though sometimes the phone company people will be willing to look at it The usual cause is a Telco problem like misprogramming or an intermittent connection If you are convinced that the problem lies with the ISDN line you may be able to convince the Telco to have an engineer look at the line with an analyzer This works much like the TWO s internal analyzer but with more detail and in a format that is more readily understandable by telephone people This procedure may sometimes be the only way to get attention to a line problem It is hard to deny evidence provided by their own gear In rare cases there could be a software bug in the TWO that reacts badly to something coming from the IS
25. little or no cost penalty for transitioning to digital when two channels are required Even when only one channel is needed the cost is generally not prohibitive In addition many modern PBXs are now able to support ISDN style connections The Telos TWO contains an integrated suite of audio processing functions to achieve optimum results from real world telephone connections Send Receive separation Feedback reduction in the acoustic path High grade Digital to Analog conversion Improved send to caller levels Sampling rate conversion Automatic gain control AGC Adaptive digital dynamic equalization DDEQ Caller ducking Hum filtering Caller ID Conference linking At Telos we have years of experience working with telephone networks for broadcast and professional audio applications We have put everything we have learned into the design of the Telos TWO All processing is performed in the digital domain with high speed Digital Signal Processing DSP circuits CHAPTER 1 1 INTRODUCTION TELOS TWO USER S MANUAL We intend the Telos TWO for applications such as television IFB radio newsrooms and production studios where multiple line selection is not required For applications which need line selection capability we suggest our TWOx12 or System 2101 which include this functionality Alternatively you may use an ISDN PBX as a pre selector to route channels into the TWO 1 2 Why ISDN
26. nominal audio close to that used in your facility 1 e 7 0 4 or 8 dBu Note that the lower of this setting the higher the level on the unit s meters since this setting reflects nominal input level CHAPTER 2 39 INSTALLATION TELOS TWO USER S MANUAL Next adjust your console output level for the mix minus or the Send Level adjustment found in the Audio Settings screen This control sets the level for both inputs If you cannot get sufficient levels with the Send Level set to ODB then go back to the nput Gain selection and set the input gain to the next lower setting If the inputs are not reading identically you will need to adjust them at the output of the console We suggest that you keep the peak level below a 6 reading this will allow some room for error on the part of your operators If you are using a tone to set levels you may need to set them considerably lower HOT TIP If you have previously determined the clipping point of your console you can just set the levels using the chart in section 3 4 1 Recall that the system allows for 13dB of headroom regardless of the send level adjustment setting so you should select a nominal Input Gain setting about 13dB below the clipping point of your board Of course if you already know the clipping point of your console you probably don t need this advice Set the right meter to STUDIO OUT if necessary by pressing the button located on the meter You should see
27. not at all likely to be a problem When there is a problem you can solve it by increasing the DuplexLevel ducking selection in the Audio menu See section 3 4 1 for details CHAPTER 2 26 INSTALLATION TELOS TWO USER S MANUAL Main Program Microphone Output Other Sources Zephyr for music etc Telephone Trans Mix Minus mission Path Gy Remote P Mix Minus Talent Headset Studio Console REMOTE SITE STUDIO Diagram showing system set up for remotes with delay in the transmission path and calls taken at the studio 2 5 2 Input To Caller Left amp Right Analog Audio INPUT TO CALLER PIN FUNCTION Ground Audio Audio The analog audio inputs have the following characteristics CHAPTER 2 27 INSTALLATION TELOS TWO USER S MANUAL Active balanced Line level 7 to 8 dBu nominal level See section 3 4 1 Headroom 13dB Bridging 2 1OOKQ impedance The inputs are designed to be sourced from balanced line level signals Older equipment with a transformer output stage may need a terminating resistor across pins 2 and 3 consult the manual for your equipment Unbalanced sources may be used by connecting pins amp 3 to the source ground while the signal high is connected to pin 2 HOT TIP The signal fed to these inputs should be a mix minus or system performancewill be severely degraded See section 2 5 1 for details on mix minus The sensitivity of the send inputs are adju
28. of the ISDN connection is on the rear panel near the S jack Normal status is indicated by this green LED being lit Rapid flashing about five times per second indicates a loss of the ISDN connection at the lowest physical level If the NTI can contact the central office the LED will blink slowly about once per second The LED will come on solid when all handshaking is completed and the basic line connection is good HOT TIP Normally the Telephone Company should supply an RJ 11 jack for the U interface This is the same 6 pin plug used for analog lines However sometimes you may find an 8 pin RJ 45 jack and sometimes you may evenbe charged extra for it If you have this situation an RJ 11 plug can be inserted into the center of an RJ 45 jack to make things work If you discover that the Telco charged you extra be sure to request a refund 2 4 2 Worldwide outside the USA amp Canada The S T Only Interface The Telos TWO connects to the NTI at one of the TERMINAL jacks The NTI is sometimes generically called a NCTE Network Channel Terminating Equipment or in some countries an NTBA Use only an 8 pin RJ 45 style cable Unshielded twisted pair category 3 or higher cable should be used The cable details are shown below BRI S Interface cable Note Pin 1 is to the right when viewed as above with pins facing you and at the top CHAPTER 2 14 INSTALLATION TELOS TWO USER S MANUAL 2 Green White PS 3 Power
29. of the phone number plus a few prefix or suffix digits There is frequent confusion between phone numbers and SPIDs even among telco personnel While the SPID frequently includes the corresponding phone number this is not necessarily the case The intention of the SPID is to allow the Telco equipment to automatically adapt to various user requirements by sensing different SPIDs from each type or configuration of user terminal None of this matters with our application but we must enter the SPIDs nevertheless BellSouth has proposed and most of the other telephone companies have agreed to implement a standardized SPID for new installations As of this writing it has been implemented by most telcos The standard is area code phone number 0101 XXXYYYZZZZ0101 Unless you are using the AT amp T PTP protocol your Telco service representative should give you one SPID for each B channel you order Don t let the phone company installer leave without providing you with the phone numbers of your B channels called Directory Numbers or DNs and your SPIDs CSD and CSV Recall that each ISDN BRI has two possible B channels It is possible to order a line with one or both of the B channels enabled and each may be enabled for voice and or data use Phone terminology for the class of service is CSV for Circuit Switched Voice and CSD for Circuit Switched Data In contrast to PSD Packet Switched Data which is possible but irrelevant to our needs CS
30. personal telecommunications user is temporarily not addressable at any user network interface Cause No 21 Call rejected This cause indicates that the equipment sending this cause does not wish to accept this call although it could have accepted the call because the equipment sending this cause is neither busy nor incompatible This cause may also be generated by the network indicating that the call was cleared due to a supplementary service constraint Cause No 22 Number changed This cause is returned to a calling party when the called party number indicated by the calling party is no longer assigned The new called party number may optionally be included in the diagnostic field If a network does not support this cause cause no 1 unallocated unassigned number shall be used CHAPTER 4 101 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL Cause No 26 Non selected user clearing This cause indicates the user has not been awarded the incoming call Cause No 27 Destination out of order This cause indicates that the destination indicated by the user cannot be reached because the interface to the destination is not functioning correctly The term not functioning correctly indicates that a signal message was unable to be delivered to the remote party e g a physical layer or data link layer failure at the remote party or user equipment off line Cause No 28 Incorrect number invalid number format
31. power connector 2 Remove top cover Remove all 7 Phillips head screws from the top cover 3 Remove the old firmware SIMM CHAPTER 4 90 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL e Turn the right side of the unit towards you the power supply will be away from you e Push gently outward on the two metal catches on either end of the SIMM module It should pop toward you e Pivot the top of the SIMM module toward you and then lift it out Note the grooved notch on the right end 4 Install the new SIMM module e Locate the notch on the SIMM module to your right towards the rear of the ZephyrExpress e Ata 30 degree angle from vertical insert the SIMM module into its socket It should slide in with no resistance The module will be angled towards you e Using your two thumbs push on the green area near either end of the SIMM module The top of the SIMM module should pivot back and the catches on either side should click If this does not happen remove the SIMM module see step 3 above and try again 6 Reinstall top cover Please return the old SIMM module to Telos via regular US Mail Your prompt return of this module will allow us to continue to offer you upgrades in the future at the lowest possible cost 4 3 General Troubleshooting Thinking About Problem Solving Despite best intentions something could always go wrong Sometimes troubleshooting a balky set up can make even the toughest enginee
32. request to use a channel not active on the interface for a call Cause No 83 A suspended call exists but this call s identity does not Cause No 84 Call identity in use This cause indicates that a call identity is in use Cause No 85 No call suspended This cause indicates that no call is suspended Cause No 86 Requested call identity cleared This cause indicates that the call having the requested called entity has cleared CHAPTER 4 104 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL Cause No 88 Incompatible destination This cause indicates that the equipment sending this cause has received a request to establish a call which has low layer compatibility high layer compatibility or other compatibility attributes e g data rate DN subaddress which cannot be accommodated This call can also be returned by a switch to a CPE when trying to route a call to an incompatible facility or one without data rate Cause No 91 Invalid transit network selection This cause indicates that an Invalid transit network selection has been requested Cause No 95 Invalid message unspecified This cause indicates that the entity sending this cause has received and Invalid message only when no other cause in this class applies Cause No 96 Mandatory Info missing This cause indicates that the equipment sending this cause has received a message which is missing an information element which must be pres
33. simply the telephone number and the system uses this to send the call to the correct line IMPORTANT Each directory number will correspond to one SPID You must enter them to reflect this relationship The DN corresponding to SPID1 must be entered as DNI while the DN corresponding to SPID2 must be entered as DN2 If you experience problems only with incoming calls check your DNs HOT TIP Some versions of the Telos Zephyr and ZephyrExpress do not require that Directory Numbers be entered This is not true for the Telos TWO You must correctly enter these numbers for the system to work CHAPTER 3 63 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL DEEP TECH NOTE The actual physical B channels timeslots of the BRI line are assigned on a per call basis with the first incoming call assigned to the first B channel However the call setup message on the D channel includes what number was dialed and the Directory Number allows the system to sort it all out DN2 When you are using the National ISDN 1 Telco mode you must enter the Directory Number here for Line 2 If you only have a line with one channel enabled there will be no DN2 IMPORTANT After you enter or change your SPIDs or DNs you must restart the system to use the new information Therefore once you have entered SPID1 SPID2 DN1 and DN2 you should go to the Telco menu selection and push the Select button twice Then go to the ISDN status s
34. testing purposes Section 4 3 has more information on troubleshooting Off This 1s the normal operating mode No loopback path is turned on Studio Input is sent as send audio and caller audio is presented at Studio Out Studio This loops the AES EBU input and analog signal after Analog to Digital conversion back to the AES EBU output and analog output via the Digital to Analog converter This can be used to proof the audio input and output sections Hemote Control This item determines whether the TWO will allow control via the Serial and Ethernet ports None The system will not allow access through either control option RS232 System control is only permitted through the RS232 port System control 1s not possible through the Ethernet port RS232 Trust System control is permitted through the RS232 port Telnet sessions from permitted trusted addresses such as Telos Technical Support Zephyr com or Zephyr de domains or the domain entered under Trusted selection in the TCP IP Setup sub menu off the System menu While Telnet sessions will be accept from other untrusted domains they may not change any system parameters even if they have your password All System control is permitted through the RS232 port Telnet sessions are permitted from anywhere There may be a way to erase a lost password but it s messy and will take up a lot of your time and ours CHAPTER 3 69 OPERATION amp DETAILE
35. the resource unavailable class applies Cause No 49 QOS unacceptable This cause is returned when the Quality of Service is unacceptable Cause No 50 Requested facility not subscribed The cause is used to report that the user cannot use this feature because s he has not subscribed to it Cause No 51 Bearer capability incompatible with service request This cause indicates a user request for action was rejected because the action was incompatible with the capability of the call Cause No 52 Outgoing calls barred Cause No 53 Service operation violated This cause indicates that the user has violated the service operation Cause No 54 Incoming calls barred The user will not accept the call delivered in the SETUP message Cause No 57 Bearer capability Data voice not authorized This cause indicates that the user has requested a bearer capability which is implemented by the equipment which generated this cause but the user is not authorized to use it This is a common problem caused by wrong Telco provisioning of the line at the time of installation CHAPTER 4 103 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL Cause No 58 Bearer capability not presently available This caused indicates the users has requested a bearer capability which has been implemented by the equipment but is not available at this time Cause No 63 Service or option not available unspecified This cause is used t
36. the amount of cross feed audio remotely Feed Thru 1 amp Feed Thru 2 The Telos TWO has a unique Feed Through mode which can be set to off or on for each hybrid section using these selections This mode adds the Hybrid Send audio to the Studio Out audio and the resulting mix is fed to the Studio Out outputs This mode allows operation of the hybrid without a separate mix minus and does not require any input on the console mixing desk In other words this mode allows you to place the TWO in series with the output of your console with no other audio connections The primary disadvantages would be that the system is entirely dependant on the receive AGC to control audio levels and the fact that all of your audio will pass through the Telos TWO otudio Adapt This selection enables on or disables off the acoustic adaptation process used for feedback control when the system is used with open speakers The usual setting is on and should be used whenever open speakers are employed with microphones This should only be defeated when the Telos TWO is being used as a telephone coupler to send one way audio down the phone line HOT TIP When using open speakers it best not to change the speaker or mic levels or positioning while the system is operating as this will require the system to readapt and temporary feedback may occur while this is happening Adapt Burst Turns the adaptation tone sent to the caller off or on Turning this
37. to wrong jack on the TWO Or ETS 300 permits the Telco to put a line to sleep Deactivated will be displayed when this occurs Wait SPID has been sent to network DMS Cust amp Natl l 1 only Ready The units sees a live ISDN S interface i e external NT1 is present or internal NT1 has completed startup Waiting Outgoing call in process Request for call has been sent to Telco Call Proceeding Outgoing call in process Telco switch waiting for routing info from network Calling Outgoing call in process Telco has acknowledged the call request Ringing Outgoing call in process far end has generated a call alert signal Disconnecting Request to disconnect has been made awaiting acknowledgment Accepting Call TWO has accepted and incoming call and is waiting for Telco to connect CHAPTER 4 95 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL One caveat regarding the Ready Ready indication If you have this indication with the TWO s Telco mode set to AT amp T Cust and you cannot dial it is likely that your line is Natl I 1 or DMS Cust The AT amp T Cust protocol does not require SPIDs so the TWO does not send or check them it just assumes the line is OK in this regard so it gives the Ready indication though the line is waiting for the SPIDs IMPORTANT It is normal for ETS 300 lines to go to Deactivated Deactivated when not used If the system can dial normally under these circumstances this indication is not a cau
38. up during pauses You can also try increasing slightly the value of the setting for the Input Gain selection in the Audio menu therefore slightly decreasing the send to caller level The level to the caller should be ok since the Send AGC will compensate however you will force that AGC towards its maximum gain and thereby reduce how much gain it can add to the feedback path Try repositioning the mics or speakers It also helps of course to use directional mics Customers have reported good results with cardioid mics such the EV RE 20 and the Shure SM 7 Add equalization to the monitor path when open mics are used Acoustic and electrical resonances usually result in pronounced peaks in the feedback response Since there are likely to be only a few large peaks in this response characteristic flattening out those peaks with an equalizer can significantly improve the feedback margin A spectrum analyzer connected to the output of your mic processor will help detect these peaks If necessary soften acoustic room reflections by adding curtains or wall treatments HOT TIP When using open speakers it best not to change the speaker or mic levels or positioning while the system is in use as this will require the system to readapt and temporary feedback may occur The discussion above is intended to help in those situations where open speakers are a requirement Whenever possible of course it is best to use headphones to li
39. usual setting for most situations is from 10 to 15 The default setting is fault is 12 HOT TIP If you find that you have accidentally set your contrast to an unreadable setting follow these steps to restore it e Press the Status button Press the System button Press the Select button Repeatedly press the5 button Once the desired setting is reached press Select Backlight Adjusts the brightness of the backlight for the LCD screen The value 0 is dimmest and 20 is brightest The usual setting for most situations is from 15 to 20 The default setting is 20 Click Volume Adjusts the volume of the audible click generated when a button is pressed The value 0 is off and 20 is loudest quite loud in fact We prefer settings from 0 to 5 The default setting is 5 Ring Volume Adjusts the volume of the ring sound when the TWO receives a call The value 0 is off and 20 is loudest As you change this value a ring tone is generated at the CHAPTER 3 67 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL selected volume so that you can hear the effect of your adjustment The default setting is 10 System Settings Serial Bitrate 19200 Lock Password lt none gt Loop Mode Off Remote Control None Serial Bitrate Adjusts the bit rate of the RS 232 serial interface It accepts values between 2400 baud to 38400 baud 19200 is the default setting Lock Password Many of the Telos TWO s adjustm
40. 11 or or 01YYYZZZZO XXXYYYZZZZ01 or l 01YYYZZZZ000 Bell Atlantic O1YYYZZZZOO Century Telephone Or XXXYYYZZZZO00 01YYYZZZZ000 mE l or Cincinnati Bell NEN 01YYYZZZZ000 or XXXYYYZZZZ100 SPID1 00YYYZZZZ01 Bell Atlantic North n 00YYYZZZZ02 Former NYNEX OOYYYZ77701 XXXYYYZZZZ0101 or Fort Mills Telephone XXXYYYZZZZ0000 XXXYYYZZZZ Bell Canada Frontier XXXYYYZZZZ00 Communications or XXXYYYZZZZ0101 O1YYYZZ22000 APPENDIX 1 110 KNOWN WORKING SPIDS BY TELEPHONE COMPANY TELOS TWO USER S MANUAL GTE 01YYYZZZZO PNE TUE SNET Southern New or XXXYYYZZZZ0001 England Telephone i 01YYYZZZZ00 01YYYZZZZ000 Or or 01YYYZZZZ000 XXXYYYZZZZ00 or OF XXXYYYZZZZ0101 01YYYZZZZO or Southwestern Bell PIDE XXXYYYZZZZ0101 or SPID1 XXXYYYZZZZ00 SPID2 XXXYYYZZZZ01 e or SPID1 XXXYYYZZZZ0000 dis RR om XXXYYYZZZZ0001 ae or SPID1 XXXYYYZZZZ0000 SPID2 XXXYYYZZZZ0101 XXXYYYZZZZ01 Nextlink Sprint Centel XXXYYYZZZZ n or XXXYYYZZZ71 XXXYYYZZZZ0000 or XXXYYYZZZZ0101 if requested Northern Pittsburgh or SPID1 XXXYYYZZZZ000 SPID2 XXXYYYZZZZ100 Standard Telephone Telephone GA SPID1 XXXYYYABCDCD RESELL ON SPID2 XXXYYYEFGHGH Pacific Bell last two digits of phone number repeated XXXYYYZZZZ0101 or US West SPID1 XXXYYYZZZZ01 SPID2 XXXYYYZZZZ02 ond 111 or 01YYYZZZZ000 d YYYZZZZ00 or SPID1 XXXYYYZZZZ1 01YYYZZZZ000 Rome AXXYYY LLL Le Vermont Telephone XXXYYYZZZZ00 XXXYYYZZZZ0101 or XXXYYYZZZZ Rochester Telephone APPE
41. A48 of which only the center two conductors will be used You may call the manufacturer of the TWO Telos Systems at 1 216 241 7225 for any additional required information Ask for Telos TWO Customer Support APPENDIX 2 117 ISDN BRI ORDERING GUIDE FOR USA amp CANADA TELOS TWO USER S MANUAL PROTOCOL National ISDN 1 From AT amp T 5ESS Northern Telecom DMS100 and Siemens EWSD If you use IOC Capability Packages please use Capability Package S CO Values Line Type National ISDN 1 Bearer Service CSD CSV on both channels CSV only is acceptable if otherwise specified by user TEI One dynamic per number 10XXXXX Long Distance Prefix Yes Turn off features such as packet mode data multiline hunt multiple call appearances Electronic Key Telephone Sets EKTS shared directory numbers accept special type of number intercom groups network resource selector modem pools message waiting hunting interLata competition etc NOTE for EWSD running NI 97 Switch must be programmed CLID DN Note for AT amp T Lucent 5ESS on loop extended lines REX test must be disabled for this line using one of the following ASDFI266 Prohibit REX on BRI lines per office or ASDFI267 Prohibit REX on BRI lines per line Give us 1 Two SPID numbers depending upon number of active B channels 2 Two Directory Numbers PROTOCOL Northern Telecom DMS100 Functional Custom PVC1 Northern Telecom DMS100 switches BCS 31 and above CO Value
42. CHAPTER 4 97 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL What does the ISDN Cause phrase say This phrase which appears on the LCD screen after dialing comes from directly from the telephone company equipment and can be valuable for troubleshooting Generally these phrases are self explanatory Getting them means you are at least talking to the Central Office equipment There is a full description of the phrases and their meaning in this section Condition Intermittent ISDN Problems These are among the most difficult kinds of problems to solve Rest assured however that we have yet to lose one What is consistent about the problem look for patterns Keep watching for a pattern Enlist the help of the users We ve seen apparently random problems that we eventually discovered only occurred when it rained or on a certain day each week or at a certain time of day or only when another line was in use In other cases it was related to temperature or dirty AC power Assume nothing and suspect everything Leave no stone unturned while searching for the answer ISDN TIP If you are experiencing intermittent problems be sure to check the status screens often and note the following information Reboots This increases each time the system reboots If the system has been mysteriously rebooting that is surely a clue to your symptoms ISDN status If the system is not at Ready Ready status you will not be able to
43. CHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL Cause No 38 Net out of order This cause indicates that the network is not functioning correctly and that the condition is likely to last a relatively long period of time e g immediately re attempting the call is not likely to be successful Cause No 41 Net problem redial Temporary Failure This cause indicates that the network is not functioning correctly and that the condition is not likely to last a long period of time e g the user may wish to try another call attempt almost immediately May also indicate a data link layer malfunction locally or at the remote network interface or that a call was cleared due to protocol error s at the remote network interface Cause No 42 Net busy redial Switching Equipment Congestion This cause indicates that the switching equipment generating this cause is experiencing a period of high traffic Cause No 43 Access user information discarded This cause indicates that the network unable to deliver user information 1 e user to user information low level compatibility or sub address etc to the remote users as requested Cause No 44 No channel available This cause is returned when the circuit or channel indicated by the requesting entity cannot be provided by the other side of the interface Cause No 47 Resource unavailable This cause is used to report a resource unavailable event only when no other cause in
44. Caller Why do I need a mix minus Adaptive hybrids commonly used in broadcast applications since Telos pioneered the technology work by comparing the audio sent to the audio received The system then adjusts itself to minimize send audio in the audio coming back i e minimizes leakage Thus the audio fed to the hybrid is in effect a reference signal If the audio sent into the hybrid contains the caller audio the audio we want then there is no reference signal and the system cannot do its job CHAPTER 2 23 INSTALLATION TELOS TWO USER S MANUAL CURIOSITY NOTE This is why we at Telos do not claim our hybrids will work without a mix minus Sure they might work without a mix minus it has been done giving borderline performance but that s not good enough Do the job right and use a mix minus An additional problem is the potential for feedback through the hybrid In any real world situation there will be some leakage of the send audio into the received audio With gain through the AGC and console this path creates a loop and feedback can occur The Telos TWOS extremely low leakage makes this scenario unlikely however a clean mix minus is still essential for optimal performance More on Mix Minus Simple Mix Minus The simplest way to create a mix minus is to feed the mic preamp audio directly to the hybrid as well to the board mixer console mixing desk This approach lacks flexibility and requires additional equip
45. D REFERENCE TELOS TWO USER S MANUAL System Settings Remote Control ParPort TCP IP Setup Software Update ParPort Selecting the J will return you to the System menu Selecting this option displays the Parallel Port sub menu with the following options Parallel Port l Status Outl Status Outl Status Outl Status Out 1 5 The Telos TWO provides 5 Parallel Outputs numbered 1 through 5 Each of these outputs can be disabled always off or turned on True for one of three logical states Off False at all times useful for troubleshooting On True at all times useful for troubleshooting Hybl On True whenever hybrid 1 is in the ON state Hyb 2 On True whenever hybrid 2 is in the ON state Hyb 12 On True whenever Hybrid 1 OR hybrid 2 is on CHAPTER 3 70 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Parallel Port Status Inl Off Status In2 Hybl On Status In3 Hyb2 On Status In4 Hyb12 On Status In 1 4 CHAPTER 3 The Telos TWO also provides for 4 Parallel Inputs numbered 1 through 4 These inputs allow for actions to be taken by the Telos TWO on a remote basis 1 e the user provides for switching the state of these inputs on a remote basis The possible actions taken by the Hybrid are Off No action is made when a given input is active Hybl Rcv Mute The caller audio received from line 1 is muted when the associated input is active Hyb 2
46. D is not required for Telos TWO connections Even though you are sending a stream of data the phone network knows to translate this back to analog at the far end due to the call setup message sent on the D channel when the call is made If this ISDN BRI circuit will also be used with an audio codec such as the Zephyr or ZephyrExpress then CSD should be ordered as it is required for audio codec calls CSV is for interworking with voice phone service and allows ISDN to interwork with analog phone lines and phones The Hybrid supports voice calls on either of the channels if you have CSV You will be ordering an ISDN BRI 2B D line with CSV required and CSD optional on each B channel NT1s The ISDN standard specifies two reference points the U and the S interfaces The U is the single pair bare copper from the Telco CO A device called a Network Termination Type 1 converts this to the two pair S interface In Europe Asia South America and most of the world the NT1 is always provided by the Phone Company and only the S interface may be on user equipment Telos TWOs shipped outside the USA amp Canada have the S interface only In the USA amp Canada the NT1 must be provided by the user and is therefore built in to the TWO s ISDN terminal adapter In this case both the S RJ 45 and U RJ 11 interfaces are present APPENDIX 2 115 ISDN BRI ORDERING GUIDE FOR USA amp CANADA TELOS TWO USER S MANUAL Terminals
47. DN line Telos customer support will communicate the problem to our engineering guys for resolution CHAPTER 4 98 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL Gaining Access Dp Y I LJ r ELECTRIC SHOCK DISCONNECT POWER CORD BEFORE SERVICING CAUTION The installation and servicing instructions in this manual are for use by qualified personnel only To avoid electric shock do not perform any ser vicing other than that contained in the Operating Instructions unles s you are qualified to do so Refer allservicing to qualified service personnel Removal of the top plate is the first step to gaining access for service Remove the 7 Philips head screws Replaceable modules While we do not expect you to do much repair or troubleshooting of the individual circuit boards the system does have several removable modules which can be systematically replaced to aid in troubleshooting and repair The system has the following modules Telephone Interface Modules These modules are removed by first removing the two retaining screws accessed from the exterior of the case Then gently pull the card straight up You may need to push back slightly on the modular connector to clear the opening in the case as you pull it up Reverse the above procedure to replace the card taking care not to bend the pins on the connector to the motherboard main board in the process Very little force should be required to ins
48. ER 2 29 INSTALLATION TELOS TWO USER S MANUAL Input 110 This input is internally sample rate converted so may accept sources at any of the common rates from 32 to 48 kHz See section 3 4 1 for setting this parameter The left input of this AES EBU stream will be fed to Hybrid 1 while the right input will be fed to Hybrid 2 the internal routing of these two signals can be changed using the Routing option in the Audio menu Because of this fact you may need an external AES EBU router or mixer to provide this stream An alternative would be to use a single mix minus see Routing in section 3 4 1 Such mixers are available from Nvision www nvisionl com 800 719 1900 or 530 265 1021 See NV1055 HOT TIP The signal fed to these inputs should be a mix minus or system performance willbe degraded See section 2 5 1 for details on mix minus Output 110 Q The output can be synced and sample rate converted to either the frequency of the AES IN signal or locked to the ISDN network clock 48kHz depending upon a parameter in the Audio menu Even if you are using the Analog inputs the AES EBU input can be fed a reference signal to provide output synchronization Because both the left and right channels are combined on one AES EBU signal you may have to use a routing switcher distribution amp or console routing function to direct the two signals appropriately for your installation An alternative would be to bridge 2 AES EB
49. ID from your Telco IMPORTANT If your line status shows at least one of your SPIDs is incorrect or your Telco setting is incorrect In this case check the SPID For a list of known working SPIDs by telephone company see the Appendix The next tip gives some tips on SPIDs CHAPTER 3 62 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL ISDN TIP 1 Incorrectly entered SPIDs are the most common problem USA users have placing ISDN calls Compare the SPIDs you have entered with the SPIDs provided to you by the phone company to be certain that you have entered them correctly Do not add anything to your SPIDs 2 Note that there are no hyphens or dashes or spaces in SPIDs so the system will not allow you to enter any non numeric characters If your installer has included them in the SPID ignore them 3 For a list of known working SPIDs by Telephone Company see the Appendix 4 If you have any questions about your SPIDs call your phone company 5 If you have PTP AT amp T Point to Point or Euro ISDN Telco mode you should not enter anything in the SPID fields SPID2 When you are using the National ISDN 1 Telco mode you must enter the correct Service Profile ID number here SPID2 corresponds to Line 2 If you only have a line with one channel enabled there will be no SPID2 DN1 When you are using the National ISDN 1 Telco mode you must enter the Directory Number DN here for Line 1 This is
50. In a professional piece of equipment we are able to provide much better quality conversion than the usual 8 bit codecs found in Telephone Company Central Offices We use studio grade 20 bit parts Combined with noise gating and shaping we can achieve a remarkable reduction in audible noise Sampling rate Conversion When the studio connection is via a digital AES EBU channel no analog digital conversion is required but it will be necessary to adapt the sampling rate of the telephone network to the studio rate The Telco sampling rate is 8 kHz and studio equipment will usually operate at 32 44 1 or 48 kHz The Telos TWO performs the required up and down sampling while suppressing aliasing and reconstruction audio components CHAPTER 1 5 INTRODUCTION TELOS TWO USER S MANUAL Automatic Gain Control We provide this function on both the send and receive audio paths On the send side we include a limiter that works to increase the average level sent to the caller while preventing problems with overload distortion that could result from excessive input level As is well known studio operating personnel are used to having on air processing take care of level variations and are generally not very careful at riding gain On the receive side AGC is essential to address the very different levels that result from the many types of telephones and Telco analog network components Our experience is that audio volume can vary as much as 30 dB from
51. Level t X r To Line 2 Separate routing treats hybrid 1 and hybrid 2 as completely independent hybrids The only correlation between the two are the input and output gain levels and certain other options that control both hybrids The audio paths however are completely isolated from each other The separate routing choice requires that 2 mix minuses be provided and requires 2 separate faders on the console mixing desk CHAPTER 3 57 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Mix Panned This option causes the to Studio Input channels to be mixed equally and the resulting monaural send mix sent to each caller The caller audio however is not mixed equally to the studio outputs Studio Out I has a higher level of line 1 caller audio than line 2 caller audio approximately 1 4 times or 3 dB The converse is true for Studio Output 2 See diagram below Mix Panned T Lra 1 Analog Out UN x E 8 The Mix Panned gives a stereo output with the two callers panned to either side Each caller hears a mix of the two studio audio inputs This configuration requires only a single mix minus with neither hybrid s audio present This mix minus can be fed to a single studio in input if desired It requires a single stereo fader on the console mixing desk The only significant drawback to this arrangement 1s that the only way to control the relative gain of the two callers is to adjust th
52. Makes Sense ISDN is widely available cost effective and offers many advantages for studio systems It is yet another example of digital technology enhancing broadcast operations The dial up switched telephone network is nearly entirely digital except for the last mile copper connections from the central office to the customer site Central Office switches are digital long distance calls travel over digital fiber strands and many local phone paths use digital T1 lines Despite these advances the vast majority of users interface to the network via an analog technology that is little different from that employed in Alexander Bell s days To support the immense installed base of analog telephones Central Office equipment includes a stage which converts the digital signals to analog for connection to analog subscriber lines The telephone network routes calls over 64 kbps channels A sampling rate of 8 kHz is used with a word length of 8 bits The 8 KHz sampling rate supports a Nyquist audio cut off frequency of 4 kHz In practice telephone systems are designed to have audio frequency response extending to 3 4 KHz in order to allow relatively simple roll off filters to be used CURIOSITY NOTE The word length is what determines dynamic range and 8 bits would only permit 48 dB were it used in standard PCM linear fashion A primitive kind of compression is used to stretch the dynamic range uLaw in North America and much of Asia and A
53. NDIX 1 111 KNOWN WORKING SPIDS BY TELEPHONE COMPANY 7 2 Appendix 2 ISDN BRI Ordering Guide for USA amp Canada This section applies to users in Canada amp USA and is intended to help you when it comes time to order your ISDN line We assume you have read the description of ISDN in section 2 2 and are familiar with ISDNs basic concepts If you have not read that section doing so now will help you better understand the information that follows ISDN Integrated Services Digital Network is the information superhighway at your front door Because ISDN is still rather new there is still some confusion about what it is and how to get it If you know who to call and provide them with complete information the ISDN ordering process can be simple and straightforward This guide takes you through the process step by step Telos Technical Support is available by phone or fax to answer any further questions you may have On one ISDN BRI circuit there are three simultaneous bi directional channels two 64kbps bearer or B channels for the transmission of user information and one 16kbps data or D channel for call set up and status communication That is why this is sometimes called 2B D service You can use the B channels but only the phone companies and equipment manufacturers can usually use the D channel ISDN comes into your facility on two wires just like plain old telephone service POTS From the perspective of telepho
54. Optional 4 Blue White Rcv NT1 to TE from Network Orange Xmt TE to NT1 to Network 8 Brown White PS 2 Power ground ISDN S interface cable wiring diagram Both ends are wired identically Looking into the jack with the pins oriented at the top pin 1 will be to the left Unlike the USA amp Canada version the Worldwide version ISDN S interface does not provide power so the NT must be powered independently Usually the Telecom Agency will arrange for power to the NTI NTBA CHAPTER 2 15 INSTALLATION To Telco Line TELOS TWO USER S MANUAL NT1 TA EE TWO S T ISDN Interface ee The usual set up outside the USA amp Canada The S T jack is connected to the NT1 NTBA provided by the telephone authority ISDN S interface connector CHAPTER 2 2 Not Connected 4 S Receive from network 6 S Transmit to network 8 PS2 Power The S interface is a standard modular RJ 45 style jack Looking into the jack with the pins oriented at the top pin 1 will be to the left Not connected on units sold outside of the US and Canada INSTALLATION 16 TELOS TWO USER S MANUAL 2 4 3 ISDN Setup Now we need to configure your TWO for your ISDN line The following are simple step by step instructions For more additional information and numerous tips see section 3 4 2 Again this will depend on where you are located Worldwide ISDN Setup outside USA amp Canada Note Users in the
55. R a RR UE EE UA RR ER VR E RR M RC R R EEU WM B RR ERN ERE Tur 46 Generating DIM tones iossusunsuuKREuEH RH HREHUEIEEAUN VERRE EKERREENEKNEEINN NEM EN ENENENRNE RENE NERE VENE 46 Accepting Incoming Calls ee ccce erre neuen unu u nuu n unu unuununuuuurururuuruRrunE 47 3 2 Level Metenng issdacuenus auUuud vei d au wV Ru E V RERN SEEN E UR RRE KM RSS VERENERENNE E aN 47 3 3 Status DISDIAVS iiid unsa ERRHEREERENNENEREENARNESMARaEFNNARNEEUEAE NUN RENEM ERN NARNVENINNNERENSE REN NE EE 49 3 4 Advanced Setting the Hybrid s Configuration eee eere 51 3 4 1 The Audio MeMhnlissusus tano dui mE Uuich uu DRE VO Ra Rl RR d a Gru M ur RR ER RED B VERD NNn 52 3 4 2 The Tel MOBRU uissaviacusauu agn uEn REN ENEEN NE UNE HRS a NR EN EEE H C ME FERRE 62 3 4 3 The System MENG wiiecdcesicacewiwadsedssnaccceacnstustetedtuuavenccdeussudnsarceussuudeniduensuenueaee 67 3 5 Remote Gon Olle isses aav aud sad aa aaa aa aa aaa Aaa Rana aai 75 3 5 1 RS 232 COonrolcasid iaaa iaa a Aa a E a a a O BN ER NE TEM 75 3 5 2 Ethernet 10Base T control c cree een n unn unnuunauuuuuuuuuuuuuuuuuuuuRuuuRuE 81 3 6 System Audio Processing and Feedback Control 82 Send Audio Pr cesslfig ussasusawsua suE E FE FRE NER ERR NUREARENEER EE NER NEN NEN ERKENNEN aikeena MM EK UE EE 82 Receive Caller Audio Processing oer enun nana unuuunuuuu
56. SER S MANUAL COMPANY TELEPHONE NUMBER WORLDWIDE WEB Ameritech 800 TEAMDATA 800 832 6328 www ameritech com Bell Atlantic 800 570 ISDN 800 570 4736 www ba com See below for former NYNEX regions Residential 800 204 7332 Bell Atlantic North Call your account representative If you do not know who s he is call Formerly NYNEX 800 GET ISDN 800 438 4736 www nynex com Bell South 800 428 ISDN 800 428 4736 www bell bellsouth com Cincinnati Bell 513 566 DATA 513 566 3282 GTE 800 GTE 4WCN 800 483 4926 www gte com Natco 800 775 6682 ext 288 Nevada Bell Small Business 702 333 4811 Large business 702 688 7100 Pacific Bell 800 4PB ISDN 800 472 4736 www pacbell com Rochester Tel 716 777 4501 or 1234 SNET 800 430 4736 www ntplx net Stentor Canada 800 578 4736 Fax server document 200 has a list of local numbers For questions or assistance call 403 945 8130 Southwestern Bell 800 SWB ISDN 800 792 4736 www sbc com US West 800 728 4949 Fax server www uswest com small business 800 246 5226 For questions or assistance 206 447 4029 Details Details In order to communicate accurately what it is you need we think you should be familiar with the vocabulary used to describe ISDN As with anything for best results it helps to know what you are talking about For an in depth glossary of terminology please check Telos web site at http www telos systems com Protocols In a perfect world all ISDN terminal equipment would work with a
57. TELOS TWO Advanced All Digital Dual Telephone Hybrid USER S MANUAL Manual Version 1 0 e for system software version 1 0 and later 7 March 2000 Customer Service We support you By phone Fax in the USA Customer service is available from 9 30 AM to 6 00 PM USA Eastern Time Monday through Friday at 1 216 241 7225 We re often here at times outside of these as well please feel free to try at any time Fax 1 216 241 4103 By phone Fax in Europe Service is available from Telos Europe in Germany at 49 81 61 42 467 Fax 49 81 61 42 402 By E Mail The address is support telos systems com Via World Wide Web The Telos Web site has a variety of information which may be useful for product selection The URL is http www telos systems com Feedback We welcome feedback on any aspect of the Telos TWO or this manual In the past many good ideas from users have made their way into software revisions or new products Please contact us with your comments Telos Systems 2101 Superior Avenue Cleveland OH 44114 USA e toa 1 216 241 7225 um Fax 1 216 241 4103 Telos Europe JohannisstraBe 6 85354 Freising Germany 49 81 61 42 467 Fax 49 81 61 42 402 Updates The operation of the Telos TWO is determined almost entirely by software A continuous program of improvement is underway Contact us to determine if a newer release is more suitable to your needs Trademarks Telos Systems t
58. Telos TWO is used with BRI lines we will only consider that type here CHAPTER 2 8 INSTALLATION TELOS TWO USER S MANUAL B1 64kbps B2 BAkbps T6kbpe Telephone Pair ISDN BRI Multiplexes three bi directional channels on a single pair of copper wires Alphabet Soup U S and NT1 An ISDN line from the central office is a single copper pair identical to a normal analog line When it arrives at the subscriber it is called the U interface It is a two wire connection usually via a 4 pin RJ 11 modular jack The S interface is at the user side of the Network Termination Type 1 NT1 device The NTI is sometimes generically called a NCTE or in some countries an NTBA It is a four wire connection via an 8 pin RJ 45 modular jack Sometimes the S interface is called S T There is a subtle distinction between the two but it is not relevant for our purposes here and the two may be considered to be the same In the USA amp Canada NTI functionality is usually included in the terminal equipment In Europe the Telecom Agency provides the NTI To Telco U sr Interface Interface reference reference point pin _ __ IBDNEQUPMENT ISDN network connection reference points In the USA amp Canada the NT1 is owned by the end user whereas in the rest of the world it belongs to the Telecom Agency Only one NT1 may be connected to a U interface However as many as eight terminals may be parallel
59. U inputs across this output which is an acceptable practice You can find more information about the various AES Out sync modes in section 3 4 1 2 6 AC Power The AC receptacle connects power to the unit with a standard IEC connector and provides an on off switch The power supply has a universal AC input accepting a range from 90 to 240 VAC 50 60 Hz A fuse 1s located inside on the power supply circuit board CHAPTER 2 30 INSTALLATION TELOS TWO USER S MANUAL IMPORTANT As with any piece of modern electronic gear it is advisable that precautions be taken to prevent damage caused by power surges Standard line surge protectors can be used to offer some degree of protection It is the user s responsibility to ensure protection adequate for their conditions is provided WARNING THIS EQUIPMENT IS DESIGNED TO BE OPERATED FROM A POWER SOURCE WHICH INCLUDES A THIRD GROUNDING CONNECTION IN ADDITION TO THE POWER LEADS DO NOT DEFEAT THIS SAFETY FEATURE IN ADDITION TO CREATING A POTENTIALLY HAZERDOUS SITUATION DEFEATING THIS SAFETY GROUND WILL PREVENT THE INTERNAL LINE NOISE FILTER FROM FUNCTIONING Important Safety Information IF FUSE REPLACEMENT IS REQUIRED PLEASE NOTE FOR CONTINUED PROTECTION AGAINST FIRE REPLACE FUSE ONLY WITH SAME TYPE AND VALUE See the DETAILED TECHNICAL INFORMATION section for information and cautions 2 7 Remote Control Ports 2 7 1 Parallel Remote Control This port provides stat
60. and verify that this audio from the phone line is not present on the 7 LED bargraph If this audio is present here you are not feeding hybrid 1 a mix minus and you must fix this problem before you proceed CHAPTER 2 40 INSTALLATION TELOS TWO USER S MANUAL Drop the call by pushing the Line 7 button and then pressing Drop IMPORTANT If you are using one of the routing schemes that requires only a single mix minus you should not have seen audio on either the 1 or 2 bargraphs in the previous test In that case you can skip the next test See section 3 4 1 for detailed information about the TWO s routing options Now we will verify the second mix minus Press the Line 2 button to select that line for dialing Enter the number for a telephone line which has audio present using the dial pad calling the time or weather number works well for this Press Send to make this call Bring up hybrid 2 on the console You will hear the audio from the phone line Look at the left meter on the TWO and verify that this audio from the phone line is not present on the 2 LED bargraph If this audio is present here you are not feeding hybrid 2 a mix minus and you must fix this problem before you proceed Drop the call by pushing the Line 2 button and then pressing Drop Ok now we just need to test the system as whole We suggest calling your spouse or partner and reporting that you will be home for dinner after all
61. ank The TWO has two independent banks of flash memory for software storage This menu selection determines which bank and hence which software version will be loaded at startup The Primary bank is the default choice and is the only bank with software when the unit is shipped When a new software version is downloaded into the Secondary bank After a successful download this selection will be changed to Secondary and the new CHAPTER 3 73 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL software will be booted the next time power is cycle off and on However you may change the selection back to Primary should you determine that you prefer the original software This allows you to compare the two version and determine which version better meets your needs Update software This menu brings up a query window which asks Are you sure you want to download new software into this unit If you do not wish to do so you should press Select or any of the Menu keys to abort If you do wish to download new software press or to highlight yes and then press Select to begin the download process You will see the message Please wait while new software is being downloaded and burned into the internal SIMM memory Once the download is complete the unit will reboot and the new software will be running If the download is unsuccessful the system will display an error mode Please write down the complete error message check you
62. ation from this bank you must change the Boot Bank selection in the Software Update sub menu off the System menu to Secondary and cycle power to test and evaluate the new software The complete software process typically consists of these steps 1 Download software and boot into secondary bank 2 Execute secondary software for some evaluation time During that time no new software can be downloaded 3a If the new software does not meet your needs or you wish to run the old software for comparison you can go back to the old version Do this by changing the Boot Bank selection in the Software Update sub menu off the System menu to Primary and cycle power to go back to the old software 3b If the new software is ok make it the permanent one by committing it to the primary bank After that new software can be downloaded in the future 4 If the new software did not meet your needs you can download another version once you have set your Boot Bank menu back to primary without first committing the version previously downloaded 3 5 Remote Control May be accomplished by any of the following The TWO s Parallel Control Inputs and Outputs see the previous section The Super Auto Answer ports see section 2 7 2 RS 232 serial connection An Telnet session over the Ethernet 10Base T connection 3 5 1 RS 232 Control Section 2 7 3 has details on the physical interface We will discuss the TWO s command set here Note
63. atus In option of the System menu See section 3 4 3 for details of the options and how to set them CHAPTER 2 32 INSTALLATION TELOS TWO USER S MANUAL e All inputs are specially treated to accept either a voltage 0 low and up to 24 Vdc high or a closure to ground which may be provided by switches relays or logic outputs The inputs are active low e A built in 1kQ pull up resistor is provided so TTL outputs can be directly interfaced See below for a simplified schematic of the input circuitry of the TWO 30v max d Parallel logic input circuit DEEP TECH NOTE The TWO s universal logic input circuit can be used with switch or relay closures voltage levels up to 24 Vdc or logic outputs either totem pole or open collector OUTPUTS Outputs are open collector to ground and can sync up to 400 mA of current Their function is determined by the Status out option of the System menu These will require a pull up resistor to function with other logic inputs Some equipment has the pull ups built into their control inputs check the device s manual to be sure If there is no pull up in the interfaced equipment you ll have to add one An appropriate value is 2 2KQ Current should be limited to 400 ma maximum per output with total output restricted to 1 amp 200ma each output if all five will be used If used with a relay or LED then tie your external power source ground to pin 1 or use the 5 VDC power suppl
64. audi A set up taking advantage of the S T jack ISDN permits multiple devices to connect to this bus Here a TWO and an ISDN phone share the line The configuration outside USA amp Canada would be similar except the NT1 would be external to the TWO It is also possible to use an external NT1 connecting it to the S T interface The NT1 power may come from the Telos TWO using the PS 2 power arrangement units sold in the USA amp Canada only so no additional power supply is needed Some telephone sets may be powered from the Telos TWO as well The S T cable has wider plugs than a normal telephone cable using 8 pin RJ 45 connectors Four of the wires are used for the S interface and two are used to convey power from the Telos TWO to the NTI For more information on this interface see section 2 4 2 Contact Telos Technical Support for a list of telephones known to work well with the Telos TWO CHAPTER 2 13 INSTALLATION TELOS TWO USER S MANUAL IMPORTANT If using an external NTI or connecting another device be sure to check power arrangements The Telos TWO provides PS 2 power on pins 7 amp 8 of the S T jack If your NTI or other device has its own supply it is essential that the two power leads not be interconnected or damage to the Telos TWO external equipment or both may occur Contact Telos Systems technical support for additional information if needed U Interface Status LED The LED indicator of the status
65. ave highlighted DNI CHAPTER 2 19 INSTALLATION TELOS TWO USER S MANUAL HOT TIP The Directory Numbers or DNs sometimes called Listed Directory Numbers or LDNs are your 7 digitphone numbers as would be found in the Telephone Directory They normally do not include the area code e Press the Select button and enter your first DN Directory Number using the numeric keypad Push Select again to confirm IMPORTANT Each directory number will correspond to one SPID You must enter them to reflect this relationship The DN corresponding to SPIDI must be entered as DNI while the DN corresponding to SPID2 must be entered as DN2 If you experience problems only with incoming calls check your DNs e Scroll down to DN2 using the Y button and repeat the previous step e Using the 7 button scroll down until Telco is highlighted with a dark bar as shown below ISDN Settings MSNI none MSN2 none Dial Prefix none Telco ETS300 e Press the Select button Using the or Y buttons find the correct protocol for your ISDN line and press the Select button again to confirm e Turn the unit off and back on again to initialize the ISDN protocol connection CHAPTER 2 20 INSTALLATION TELOS TWO USER S MANUAL IMPORTANT Each ISDN Line has a certain ISDN protocol which the phone company should have given you By far the most common protocols in the USA amp Canada are National ISDN 1 amp National ISDN 2 in w
66. call pressing one of the Line buttons answers the call on the appropriate line You should hear a chime sound as the call is answered If the autoanswer function is not on you will ringing sound If the Ring Volume setting in the System menu is high enough to permit hearing it and a display indicating you have a pending call You must then press a line button to answer the call on the corresponding hybrid HOT TIP The Auto Answer setting in the Telco menu can be set so that the TWO automatically answers calls See section 3 4 2 for how to do so 3 2 Level Metering The Telos Two includes two LED dual level meters Send Meters The leftmost meter pair can display either the Studio In levels Input to caller 1 amp 2 from your console or the Hybrid Send levels Line 1 and Line 2 to the phone line The Hybrid Send levels are active even if a line is not connected Pressing the small CHAPTER 3 47 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL button on the meter selects between Studio In and Hybrid Send This level is controlled by the nput Level selection in the Audio menu See section 2 9 2 for step by step instructions and section 3 4 1 for more information on setting this level So what s the difference between Studio Input level and Hybrid send level Well we re glad you asked The Studio Input level represents the raw digital level after the analog to digital converter or the AES EBU leve
67. cates a calls has been preempted due to the circuit being reserved for reuse Cause No 14 Excess digits received call is proceeding More digits were dialed than expected Called number has been truncated to the expected number Cause No 16 Far end disconnect Normal call clearing This cause indicates that the call is being cleared because one of the users involved in the call has requested that the call be cleared Under normal situations the source of this cause is not the network Cause No 17 Busy try again later This cause is used to indicate that the called party is unable to accept another call because the user busy condition has been encountered This cause value may be generated by the called user or by the network In the case of user determined user busy it is noted that the user equipment is compatible with the call Cause No 18 No far end response This cause is used when a called party does not respond to a call establishment message with either an alerting or connect indication within the prescribed period of time allocated before timer T303 or T310 has expired Cause No 19 No answer This cause is used when the called user has provided an alerting indication but not a connect indication within a prescribed period of time before timer T301 has expired Cause No 20 Subscriber absent This cause is used when a mobile station has logged off radio contact is not obtained with a mobile station or a
68. ce Once you have logged in you can use the log command to enable the built in ISDN protocol analyzer CHAPTER 4 106 TECHNICAL DATA amp TROUBLESHOOTING 5 Specifications General Interface for connecting ISDN BRI SO ISDN 2 telephone lines to professional studio equipment ISDN Connectivity Compatible with e National ISDN 1 and 2 DMS 100 Custom Functional AT amp T SESS Custom Point to Point Protocols e Euro ISDN conforming to the NET 3 ETS300 protocol Interface e USA amp Canada includes integral NTI for direct connection to ISDN line via the 2 wire U interface with an accessible 4 wire S bus jack e Worldwide except USA amp Canada 4 wire S interface Telephone Coding Modes Call processing G 711 standard Compression uLaw or A Law 300 3 400Hz send Input Analog XLR female pin 2 high Active balanced with RF protection Input level Adjustable in 4 steps 7 to 8 dBu nominal level Headroom before clipping 13 Bridging 2 1OOKQ impedance Analog to digital converter resolution 20 bits Receive Output Analog XLR male active differential Pin 2 high Output level adjustable from 7 to 8 dBu nominal Clip point 21dBu Output impedance lt 60Q X 2 Frequency Response 0 1dB swept sine procedure e Measured from AES input to analog output with unit in loopback mode TELOS TWO USER S MANUAL THD N lt 0 06 typical measured at 0 dBu 1 kHz Dynamic Range 93 dB D
69. crease Duplex Ducking control setting Low frequency DDEQ equalizer activity High frequency DDEQ equalizer activity Hybrid 2 Status This screen displays the same information for Hybrid 2 AES Input Status This screen displays several items relating to the status of the AES EBU input These items include Mode Consumer vs Professional stream received Indicated sample rate the rate included in the AES header Measured sample rate the actual measured rate before sample rate conversion Channel status actual AES header information in Hexadecimal Miscellaneous 1 This screen groups various miscellaneous status items Parallel control port output Displays the current state of each of the five parallel port outputs Parallel control port input Displays the state of each of the four parallel port inputs CHAPTER 3 50 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Number of reboots since the last cold boot reset Internal clock PLL lock status Miscellaneous 2 This screen provides low level status for several items including DSP software version for each of the two DSPs Time since the last warm boot or power cycle in days hours minutes seconds Unit name Version Info This screen has the same information as the one displayed when the TWO first powers up 3 4 Advanced Setting the Hybrid s Configuration You use the various configuration menus to adjust aud
70. creen and verify Ready status for both channels ISDN Settings MSNI none MSN2 none Dial Prefix none Telco ETS300 MSN1 Multiple Subscriber Number 1 Used only when you are using the ETS300 Euro ISDN Telco mode and another ISDN device is sharing the BRI circuit with the Telos TWO MSN corresponds to the first B channel Line 1 CHAPTER 3 64 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL MSN2 Multiple Subscriber Number 2 Used only when you are using ETS300 Euro ISDN Telco mode and another ISDN device is sharing the line with the Telos TWO MSN2 corresponds to the second B channel Line 2 ISDN TIP ETS 300 users should disregard all references to SPIDs ETS 300 Euro ISDN does not have SPIDs you lucky souls If your ISDN equipment configuration uses MSNs they may be entered in the MSN fields If the TWO is the only device on this ISDN 2 SQ BRI circuit MSN s will not be required Dial Prefix Here you can enter one or more digits as a dial prefix For example the 9 required to get an outside line Every time the TWO makes a call the number s entered here is sent to the network before the dialed number Use the numeric keypad to enter the number and Select to confirm Telco This item allows for the selection of the ISDN protocol standard and takes one of four values You must set this to correspond to the ISDN line you are using For Europe and many other parts of t
71. digits need not wait to determine if the last digit has been dialed it just processes the whole block when received Memory Dialing Memory dialing a call The Memory button provides access to the list of ten stored phone numbers labeled 0 through 9 The Arrow buttons Y allow the user to scroll through this list of numbers with four telephone numbers displayed at a time and the selected number highlighted on the display If the selected item has no number entered none is indicated otherwise the telephone number up to 18 digits 1s displayed You can dial the selected number by pressing the Send button Entering or Editing the stored numbers To enter or edit a number press the Select button The button allows you to backspace over any digits entered and the numeric keypad is used to enter digits When you have completely entered the number press the Select button to store it in the system s memory CHAPTER 3 45 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Dropping Calls You use the Drop button to terminate a call in progress If both lines are in use first choose the line you want to drop with one of the Line buttons Holding amp Resuming Calls The Hold button tells the telephone network to put a call on hold If there are two active calls the Line buttons determine which is affected Because this hold is handled by the telephone network and not within the Telos TWO no music on hold is po
72. dules or power supplies Later in this section is a list of such subassemblies along with part numbers The Telos customer support crew is standing by to assist with this if you need it 4 2 System Firmware Viewing Version Information To assist with troubleshooting Telos customer support may ask you to provide some software version numbers There are three components to the software system System software DSP firmware The system software affects the ISDN procedures the user interface and general operation The DSP and Xilinx firmware affect the audio processing functions The Xilinx is a Field Programmable Gate Array chip that interconnects various signal paths The software version ISDN version and build date can be determined from the start up screen Telos Two VX X XXX Software Version ISDN Version TELOS SYSTEMS yyyy mm dd Software Build Date The DSP firmware version is visible on the Miscellaneous 2 status screens TELOS TWO USER S MANUAL Replacing firmware Electronic Download Method In order to help upgrade to the latest features available we are pleased to offer firmware updates over the internet This process downloads the new firmware into a secondary bank of your TWO s memory leaving the original firmware intact You then have the option of running the new firmware or the old firmware Once you have verified that the new firmware is more suitable to your needs you may make it your default
73. e at least glanced through the material earlier in this chapter So you now know that you should have your console mix minus connected to the TWO and the TWO s outputs connected to faders on your console mixing desk The TWO should be connected to the ISDN line the ISDN protocol and other information programmed and the unit should have power and be turned on The LCD screen should be on and you should see the default screen similar to the one illustrated below Telos V 1 0 2000 01 04 Lets first check to see if the ISDN is working Then we will set our input and output levels 2 8 1 Is the ISDN working Press the Status button You should see a screen that says SDN Status at the top as illustrated below If you do not see this screen don t panic just repeatedly press the Y button until you see this screen CHAPTER 2 37 INSTALLATION TELOS TWO USER S MANUAL ISDN NI 1 Note that the current ISDN protocol setting Telco is shown at the top of the screen as well as the status of the two B channel below If you do not see READY READY on the ISDN Status screen try turning the unit off and then back on again If you still do not get READY READY you may need to go back to section 2 3 and check both your ISDN settings and set up information If the information there does not help see section 3 4 2 for additional information about the various ISDN parameters There is in depth troubleshooting information in Section 4
74. e balance control on the console input module if present CHAPTER 3 58 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Mix Mono This routing option causes the two Studio Send Input channels to be mixed equally and the resulting monaural send audio is sent to each of the two callers The caller audio is mixed equally and output on each of the Studio Outputs as shown below Mix Mono Te Line 1 The Mix Mono routing option provides identical audio with both callers on both studio outputs Each caller hears a mix of the two studio audio inputs This option requires a single mix minus with neither hybrid s audio present and requires only a single mono fader on the console The disadvantage here 1s that the operator has no control of the relative levels of the two callers and must depend on the AGC to keep these relative levels equal CHAPTER 3 59 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Mix Wide This popular audio routing option sends the same mixed monaural audio to each caller as with Mix Mono and Mix Panned The difference is that the Left Studio Output consists of only hybrid 1 received audio and the Right Studio Output only hybrid 2 received audio Send Level 2 e 5 x Te uu From Line 2 The Mix Wide routing option gives independent caller audio outputs Two independent caller outputs allow for maximum mixing control This option requires only
75. eaker is required for monitoring calls coupling into the announce microphone can create feedback problems This is a common condition in television applications since on air talent and or guests often prefer not to use headphones or earplugs Feedback resulting from conferencing When multiple callers are connected simultaneously there is an audio path created that can produce feedback This occurs when the overall gain around the loop is greater than unity The usual solution is to reduce gain but this can make problems with callers hearing each other The Telos TWO has an effective adaptive canceller that automatically adapts to the conditions present on each telephone connection in order to minimize leakage making the problems described above disappear Feedback Heduction in the Acoustic Path With loudspeaker monitoring there 1s an acoustic path between the caller audio and the announcer microphones For this case we use additional mechanisms in the Hybrid to reduce feedback problems An adaptive cancellation process is applied to the acoustic path This is similar to but different from the canceller on the telephone network side A frequency shifter adjusts the send audio spectrum slightly downward which prevents feedback from building up A dynamic gain reduction function can be set to reduce gain in the send path when the announcer is silent and the caller is speaking High grade Digital to Analog Conversion
76. ease AGC activity or the6 to decrease AGC activity then push Select to confirm your choice The levels displayed are in decibels relative to the full scale limit of the Telos TWO dBFS Thus OdB represents the maximum level that can be passed through the system above which clipping will occur The metering includes a peak level function The LED segment indicating the peak level remains on for approximately one second holding the peak value CHAPTER 3 48 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL AES EBU SYNC CLOCK ISDN BRI i ISDN INTERFACE BLOCK ISDN MASTER CLOCK AES DSP BLOCK l I I AES EBU i AES EBU SAMPLE SAMPLE RATE l RATE CONVERTER l BUERNE CONVERTER ia DECISION INPUTS o4 Boer OUTPUTS l I ve M omm ie BLOCK ud BLOCK pae ANALOG TO DIGITAL CONVERTER ANALOG HYBRID Er BLOCK COO AGC AES EBU AGC BLOCK BLOCK INPUT SELECT O O ANALOG STUDIO INPUT HYBRID RECEIVE SEND SDN AUDIO METER ek SELECT HYBRID SEND STUDIO OUT Tc CONTROL AUDIO TELOS TWO Signal Flow 3 3 Status Displays Pressing the Status button displays the various status screens Eight different status screens display information about the state of the Telos TWO and various user settings but do not allow you to make any changes The Arrow buttons Y cycle through the eight screens ISDN Status This screen shows the sta
77. ed onto an S bus In the USA amp Canada it is recommended that professional equipment provide access to the S interface so that it is possible to parallel multiple terminals and we do this with the Telos TWO The North American version interface has an internal NT1 with both U and S connectors available Section 2 4 has specific information on connecting the unit in various regions of the world CHAPTER 2 9 INSTALLATION TELOS TWO USER S MANUAL 2 3 Ordering ISDN The Telos TWO supports the usual protocol standards For USA amp Canada National ISDN 1 amp 2 AT amp T Custom Point to Point Northern Telecom Nortel DMS 100 Custom functional For Europe and many other parts of the world Euro ISDN according to ETS 300 NET 3 B and D Channels The B Bearer Channels are the 64 KBPS paths that carry the voice audio The D Data channel is the path between the central office and terminal equipment that is used for call set up and status communication All lines must have a D channel but there is sometimes a choice as to the number of enabled B channels The Telos TWO supports both B channels but if you only need one you may be able to reduce line expense by specifying that you need only one channel CURIOSITY NOTE While the D channel is always present for signaling it can in theory be used for packet data connections ISDN lines where the D channel is used for signaling only are sometimes
78. ent in the message before that message can be processed Cause No 97 Message type non existent or not implemented This cause indicates that the equipment sending this cause has received a message with a message type it does not recognize either because this is a message not defined or defined and not implemented by the equipment sending this cause Cause No 98 Message not compatible This cause indicates that the message received is not compatible with the call state or the message type is non existent or not implemented Cause No 99 Info non existent or not implemented call processed This cause is sent when the equipment sending this cause has received a message which includes the information elements not recognized because the information element identifier is not define or it is defined but not implemented by the equipment sending the cause However the information element is not required for the equipment sending the cause to process the message Cause No 100 Invalid information element contents This cause is returned when the equipment sending this cause has received an information element that it has implemented however one or more field of the information element are coded in such as way e g truncated invalid extension bit invalid field values etc that has not been implemented by the equipment sending this cause Cause No 101 Message not compatible with call state Protocol error threshold This ca
79. ents are not appropriate for casual operators and some can cause it to stop working Therefore we provide a way to lock out changes for all but routine adjustments By default there is no password When you enter a Lock Password non routine entries will not be possible After you enter the password the front panel is in an unlocked state until you provide a new password When locked settings and values can be viewed but they cannot be changed Only the following options can be changed if the system 1s locked Telco Auto Answer System Contrast Backlight Click Vol Ring Vol If a password has been entered previously it can be deleted by pressing the Arrow button to backspace over the old password Enter the new password with the keypad 0 through 9 and and buttons If you press Select without deleting the previous password it becomes the active password again and the system will be locked again Whenever the password is entered or reentered your current password is displayed so you can confirm correct entry Push the Status button once you have confirmed your current password to hide this information CHAPTER 3 68 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL HOT TIP Enter your password carefully and be sure you can remember your new password Once you enter a password you will not be able to access important set up parameters Loop Mode This item allows the Telos Two to loop audio primarily for
80. epresentative to make arrangements for service TABLE OF CONTENTS In Notices and Cautions CAUTION THE INSTALLATION AND SERVICING INSTRUCTIONS IN THIS MANUAL ARE FOR USE BY QUALIFIED PERSONNEL ONLY TO AVOID ELECTRIC SHOCK DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO REFER ALL SERVICING TO QUALIFIED PERSONNEL WARNING TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE DO NOT SHOWER WITH THE UNIT This symbol wherever it appears alerts you to the presence of uninsulated dangerous voltage inside the enclosure voltage which may be sufficient to constitute a risk of shock This symbol wherever it appears alerts you to important operating and maintenance instructions Read the manual O PREVENT RISKS O ELECTRIC SHOCK DISCONNECT POWER CORD BEFORE SERVICING USA CLASS A COMPUTING DEVICE INFORMATION TO USER WARNING This equipment generates uses and can radiate radio frequency energy If it is not installed and used as directed by this manual it may cause interference to radio communication This equipment complies with the limits for a Class A computing device as specified by FCC Rules Part 15 Subpart J which are designed to provide reasonable protection against such interference when this type of equipment is operated in a commercial environment Operation of this equipment in a residential area is likel
81. ert the card 1 Power Supply Part PSUP 2X12 2 ISDN interface card single S and U interfaces Part 0180 110C USA and Canada 3 ISDN interface card single S interface Part 0180 120C Worldwide 4 Firmware flash memory SIMM module for Telos TWO Part CHAPTER 4 99 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL ISDN Cause Phrases Values When there is an ISDN problem or event in the network a phrase appears on the TWO s LCD that communicates information about the cause of the trouble These Cause Values are numbers generated by the network which the TWO translates to the associated phrases When possible we use the translation suggested by the Bellcore standard Cause No 1 Check number redial This cause indicates that the called party cannot be reached because although the called party number is in a valid format it is not currently allocated assigned Cause No 2 No route to network Prefix 0 dialed in error This cause indicates that the equipment sending this cause has received a request to route the call through a particular transit network which it does not recognize The equipment sending this cause does not recognize the transit network either because the transit network does not exist or because that particular transit network while it does exist does not serve the equipment which is sending this cause Or This cause indicates the prefix 0 is invalid for the entered number Cau
82. es not matter e Connect Using select the com port connected to the TWO Now click on ok Next you will see a Com Properties Dialog box Enter the following information e Bits Per Second set to match Serial Bitrate setting in the TWO s System menu selection e Data Bits set to 8 e Parity set to none e Stop Bits set to 1 e Flow control set to none Now click on ok Once you have made the physical connections and programmed your terminal emulation software you should see a blank terminal window If all is ok you should see your own characters echoed back when you type If not check the settings and make sure your are properly connected You may wish to try another cable You may need to contact your software vendor for advice Note that in the following section we will use bold type like this to indicate what you would type and Courier type like this to show what the system would display lIftwo parameters are separated by a I character this represents that you should choose one parameter from the list As usual ignore quotes or when typing entries You should now be able to login using the following command Login password lt enter gt The system should respond Logged in with user rights gt gt CHAPTER 3 76 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL The default password is user Once you have logged in you can get the most up to date l
83. firm that the ISDN line is ready with the ISDN Status screen Press the Status button to display this screen If all is OK you will see the Ready indication for one or both B channels depending upon your line s capabilities as shown below ISDN NI 1 CHAPTER 3 43 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL If you do not see READY READY as the ISDN Status first cycle power to the TWO off and then back on If you still do not see READY READY on the ISDN Status screen review the information in sections 2 3 2 4 2 8 1 amp 3 4 2 and check both your ISDN settings and set up information If the information there does not help there is in depth troubleshooting information in section 4 IMPORTANT Users in the USA amp Canada should see READY READY status whenever the system is idle However on certain ETS 300 Euro ISDN lines the system will go from READY READY to DEACTIVATED DEACTIVATED This is normal and is no cause for alarm unless you are experiencing problems dialing 3 1 Making and Accepting Calls Selecting Lines Recall that there are two channels available on an ISDN line Usually it is possible for a line to be ordered with only one channel enabled however rarely is this the case In order to use terminology familiar to operators we use the term line to refer to a channel The TWO has two Line buttons These select a line for dialing dropping or holding The LED adjacen
84. he Telos logo TWO TWOx12 Zephyr ZephyrExpress and System 2101 are trademarks of TLS Corporation All other trademarks are property of their respective holders Copyright Copyright O 1994 99 by TLS Corporation Published by Telos Systems who reserves the right to make improvements or changes in the products described in this manual which may affect the product specifications or to revise the manual without notice All rights reserved Notice All versions claims of compatibility trademarks etc of hardware and software products not made by Telos which mentioned in this manual or accompanying material are informational only Telos Systems makes no endorsement of any particular product for any purpose nor claims any responsibility for operation or accuracy Warranty This product is covered by a one year limited warranty the full text of which 1s included in the Appendix of this manual Service You must contact Telos before returning any equipment for factory service Telos Systems will issue a Return Authorization number which must be written on the exterior of your shipping container Please do not return cables or accessories unless specifically requested by Telos technical support Be sure to adequately insure your shipment for its replacement value Packages without proper authorization may be refused US customers please contact Telos technical support at 1 216 241 7225 All other customers should contact your local r
85. he most sophisticated equalizer available in a telephone hybrid All processing is performed in the digital domain The Receive EQ selection controls the type of equalization applied to the receive telephone audio as follows Off The caller audio is passed without modification The Rev EQ values see below are ignored in this mode Fixed This is a simple manual equalizer mode where EQ values selected for LF and HF are applied constantly Adaptive Digital Dynamic This 1s a three band dynamic equalizer The proper values of high and low frequency boost or cut is automatically determined and set We ve chosen frequency breakpoints time constants and other characteristics to optimize the tonal quality of varied telephone callers The Rcv EQ values see Section 3 4 1 are ignored in this mode This is the default selection e Fix Adapt The Dynamic EQ uses the Rcv EQ values see Section 3 4 1 as target levels Otherwise the functioning is the same as Adaptive CHAPTER 3 84 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Duplex Ducking System The ducking functions occur on both the send and caller audio Provides an aesthetic control over the caller that many programmers prefer When the announcer speaks the caller is ducked or reduced in volume dynamically This is particularly true when the caller is carrying on and the programmer wishes to get a word in edgewise so the show can conti
86. he rare occasion where you might wish to modify this If HybMix on is asserted the caller to caller gain will increase from the previously set value the Hybrid Mix setting in the Audio menu to 8dB If the Hybrid Mix setting was already set to 12bB nothing will happen When you stop asserting this input the crossfeed will return to the value set for Hybrid Mix in the Audio menu TCP IP Setup Selecting the will return you to the System menu Selecting this option displays the TCP IP Settings sub menu with the following options TCP IP Settings 34 IP Addr 0 0 0 0 Subnet 259 295 2533 0 Gateway 233 259 2239 255 IP Addr This is the IP address for this TWO As with any computer on an IP network the TWO must have an IP address before it can be used over the network Since this address must be unique you ll have to ask whomever manages your network to give you this number Actually an IP address 1s a series if 4 numbers separated by period Enter the numbers using the dial pad Both and will give you a period As usual the key will backspace if you make a mistake or need to delete an old entry Subnet CHAPTER 3 This is your subnet mask The subnet mask is to determine the size of your local network All packets addressed to a destination outside this local area are sent to the gateway node entered in the next selection Just as with the IP address the Subnet mask is a series if 4 numbers separated by period
87. he world ETS300 This is the very common Euro ISDN according to the ETS300 standard For USA amp Canada and a few other parts of the world Natl I 1 National ISDN 1 is the most common protocol for USA amp Canada and some other parts of the world May also be used with lines conforming to National ISDN 2 DMS Cust For the Nortel DMS 100 switch custom functional lines AT amp T Cust This is the AT amp T Custom PTP protocol sometimes called AT amp T custom Point to Point CHAPTER 3 65 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL IMPORTANT If you are in Europe or most of South America you should choose ETS300 If you have Net64 ISDN in Japan you should choose Natl I 1but leave the SPIDs amp DNs blank If you are in Hong Kong you should choose AT amp T Cust If you are in the USA or Canada use whichever protocol your phone company has provided If you do not know you may be able to guess see the next ISDN TIP ISDN TIP More on Telco Protocols Guessing the Telco setting in Canada amp USA If you were given only a single phone number and no SPIDs try AT amp T Cust If you were given 2 SPIDs with the format 01 7 digit phone 0 try AT amp T Cust If you were given 2 SPIDs with the format 01 7 digit phone 000 or 0147 digits 011 try Natl I 1 If you were given 2 SPIDs with the format area code 7 digit phone 4 digits for example 0101 0100 0111 or 1111 try Natl I
88. hich case you should set the Telco setting toNatl I 1 If you do not know what protocol your line is configured for try Natl I lfirst If that does not work see section 3 4 2 for hints on how to guess your protocol 2 5 Studio Audio Connections 2 5 1 Mix Minus What is a mix minus and why do I need one The Telos TWO must be fed send to caller audio which is free of the caller audio a m1x minus A mix minus is a mix of all of your audio sources which will be placed on air or recorded except the incoming caller audio thus the mix minus designation The European term mix minus one is a clearer term for the typical situation Most modern consoles mixing desks are able to handle one or two of these but more may be difficult In that case it may be necessary to get creative The important thing to remember is that the hybrid must not chase its tail where its output makes its way somehow back to the input Some examples Example 1 Using a broadcast console mixing desk A multi bus stereo broadcast console is in use Program is used to feed the transmitter and Audition is used for some other application A third buss Utility is not in use so we will use this to create a mix minus for a single hybrid All sources including the hybrid will be assigned to Program so the audience can hear them as usual We will also assign most of these sources to Utility as well just never the fader representing the hybrid
89. hip for a period of 90 days from the date of receipt by the end user This warranty is void if the Product is subject to Acts of God including without limitation lightning improper installation or misuse including without limitation the failure to use telephone and power line surge protection devices accident neglect or damage EXCEPT FOR THE ABOVE STATED WARRANTY TELOS SYSTEMS MAKES NO WARRANTIES EXPRESS OR IMPLIED INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE In no event will Telos Systems its employees agents or authorized dealers be liable for incidental or consequential damages or for loss damage or expense directly or indirectly arising from the use of any Product or the inability to use any Product either separately or in combination with other equipment or materials or from any other cause In order to invoke this Warranty notice of a warranty claim must be received by Telos Systems within the above stated warranty period and warranty coverage must be authorized by Telos Systems If Telos Systems authorizes the performance of warranty service the defective Product must be delivered shipping prepaid to Telos Systems 2101 Superior Avenue Cleveland Ohio 44114 Telos Systems at its option will either repair or replace the Product and such action shall be the full extent of Telos Systems obligation under this Warranty After the Product is repaired or replaced Telos Systems
90. hyr or ZephyrExpress then you need to be sure that the data capability circuit switched data or CSD is enabled Ordering Help An appendix to this manual describes the ordering process for USA amp Canada ISDN in detail and includes ready to go forms that can be used to order lines from your telephone company We strongly recommend confirming your ISDN order in writing using those forms 2 4 Connecting the Telos TWO to ISDN The TWO uses an internal plug in module to attach to ISDN This module may have one or two modular jacks accessible through the rear panel opening depending upon whether it 1s the version for USA amp Canada or the rest of the world In the USA amp Canada a direct connection to the bare copper 2 wire U interface is required Therefore the USA amp Canada interface module includes an integral NT1 Users in USA amp Canada should follow the setup information in section 2 4 1 In the rest of the world the Telephone Company provides the NT1 and the 4 wire ISDN S interface will be used via the 8 pin RJ 45 jack The ISDN interface in Telos TWOs shipped to these locations is provided only with this connection Users outside the USA amp Canada should skip ahead to section 2 4 2 CHAPTER 2 11 INSTALLATION TELOS TWO USER S MANUAL 2 4 1 USA amp Canada Using the U and S T Interface Connect the ISDN line from the telephone central office directly to the smaller RJ 11 style U interface modular jack o
91. ied on pin 8 and run this power source through your device with a resistor in series to limit maximum current to 400ma CHAPTER 2 33 INSTALLATION TELOS TWO USER S MANUAL For additional information refer to section 3 4 3 2 7 2 SAA 1 amp 2 ports These ports are unimplemented and are reserved for future use e Gaza o SAA 1 e Gaza o SAA 2 CHAPTER 2 INSTALLATION TELOS TWO USER S MANUAL PIN FUNCTION Note this pin is wired in parallel with pin 8 of the Parallel control port and both SAA connectors Reserved for future expansion The input and output electrical characteristics are the same as the general purpose inputs and outputs see section 2 7 1 Note that the 5 volts DC on pin 3 has both SAA ports in parallel with pin 8 on the parallel remote control port Failure to limit the combined current on these pins to 400mA could cause hardware damage or system instability CHAPTER 2 35 INSTALLATION TELOS TWO USER S MANUAL 2 7 3 RS 232 Serial Remote Control The RS 232 serial port supports asynchronous data 9 bits no parity 2 stop bits 2400 38 400 bits per second The clear to send CTS handshake signal is provided on pin 8 however any handshake signals from the external equipment are ignored Section 3 5 1 has a list of commands which can be sent over the RS 232 or Ethernet port to control the system Connector pin out is as follows FUNCTION 2 Rx TWO to Computer 3 Tx Comp
92. igital to analog converter resolution 16 bits AES EBU Digital Inputs Outputs Sample rates supported 32 44 1 and 48kHz Input clock AES input or ISDN network clock Input Level Adjustable 27 to 12 dBfs Output Level Adjustable 27 to 12dBfs Control Ports RS 232 DB 9 male DCE connector supports asynchronous data 9 bits no parity 2 stop bits 2400 38 400 bits per second Ethernet lOBase T General purpose Input Output DB 15 connector with 5 status outputs and 4 control inputs Super Auto Answer Ports 2 provided DB 15 connector Each port has Auto Drop and Seize Inputs and has Line and Auto mode outputs Also provides a 4 bit DTMF decode output and valid data output Power Integral switching power supply accepts AC mains power from 90 to 240 volts at 50 60 Hz oize and Weight H 2RU D 13 in 33cm Weight 10lbs 4 5 kg CHAPTER 6 108 SPECIFICATIONS 6 Warranty and Application Caution TELOS TWO LIMITED WARRANTY This Warranty covers the Products which are defined as the various audio equipment parts software and accessories manufactured sold and or distributed by TLS Corp d b a Telos Systems hereinafter Telos Systems With the exception of software only items the Products are warranted to be free from defects in material and workmanship for a period of one year from the date of receipt by the end user Software only items are warranted to be free from defects in material and workmans
93. io levels set the ISDN parameters etc The buttons located near the LCD display are used for this purpose Each of the four buttons below the LCD display calls up the menu item group associated with the button s name The menu groups are AUDIO TEL SYSTEM STATUS STATUS described above is not really a menu it presents screens for viewing only there are no items that can be changed See section 3 3 for details After you select a menu group you can use the arrow buttons to scroll through the available items You may select a highlighted item for modification by pressing the Select button Using the arrow Y buttons you can change the value of the setting When you reach the value you desire press the Se ect button again to lock it in and return you to the item scrolling selection mode CHAPTER 3 51 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL 3 4 1 The Audio Menu This group consists of sixteen settings that control the audio levels mixing etc i Audio Settings TN Input Source Analog Input Gain 4 dBu Send Level Send EQ Input Source The selection chooses either Analog or Digital AES EBU as the source of Studio In audio to be sent to callers Input Level Adjusts the nominal level from the console sent to the telephone line This setting ranges from 7 to 8dB in 4 steps This adjustment is before the Studio Send Input level meter It is before the send AGC b
94. ional considerations regarding feedback control Send Equalizer Applies equalization to the audio sent to the caller Choices are Off No equalization default CHAPTER 3 82 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL On Equalization for speech Enabling this equalizer On setting simulates a telephone handset microphone and will improve intelligibility Sometimes high quality studio microphones sound too good and the low frequency audio they pick up can sound unnatural on a telephone handset TE TI Hn TR LUE HAT LE LLLI LUE LAU LEI LEE 60 a M A LUC HUI ELI a I LEA LIU LL NEP Equalization Characteristics of the Send EQ Send Automatic Gain Control Limiter This AGC helps maintain consistent audio levels to the caller This function cannot be defeated This is a carefully crafted algorithm utilizing a feed forward topology with near inaudible artifacts below the limit threshold At moderate levels it is AGC like while at high peak levels it is limiter like in its effect Receive Caller Audio Processing The TWO s Receive Audio Processing consists of the following functions High pass hum filter Automatic Gain Control Noise gate Dynamic equalization Sample rate conversion High pass hum filter This filter removes hum and other unwanted low frequency noise from the caller audio This filter has a crossover frequency of 250 Hz CHAPTER 3 OPERATION
95. is is a three band dynamic equalizer The proper values of high and low frequency boost or cut is automatically determined and set The Rev EQ values see below are ignored in this mode e Fix Adapt The Dynamic EQ uses the Rcv EQ values see below as target levels Otherwise the functioning is the same as Adaptive CHAPTER 3 55 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Rev EQ Low Amount of low frequency boost or cut applied to the Hybrid Rcv audio Works in conjunction with the Receive EQ selection see above Settings from 8dB to 8dB are possible with OdB representing flat response Rev EQ High Amount of high frequency boost or cut applied to the Hybrid Rcv audio Works in conjunction with the Receive EQ selection see above Settings from 8dB to 8dB are possible with OdB representing flat response HOT TIP The Telos TWO s status screens include a meter that shows the activity of the DDEQ It can be helpful to check this meter after adjusting these EQ settings To view Rcv EQ levels Press the Stat button Use the5 or6 buttons to scroll through the status screen until you see Hybrid 1 Status or Hybrid 2 Status as required The Right most meters on the LCD screen will show the boost or cut applied to the Hybrid Rev audio Noise Gate Expander function Enables or disables a noise gate applied to the caller audio This has the effect of reducing the level of noise on the caller audio whe
96. ist of commands by typing at the gt gt prompt help enter Available commands aesebu audioin baudrate help hybduplex hybngate Tisdnoall icodback Locdoontr Log login logoff nvi reset touchtone unlock version Or type help enter for a complete list Parameter 1 none 2 command 3 lt gt Description Display list of available command amp general help 1 or help for a given command 2 or a detailed list of all commands 3 Name aesebu Parameter Description Display info about AES EBU receiver amp Dr cpm smrtier Name audioin Parameter lt a d gt Descrip tlon Switch to analog cor digital AES EBU CnpDutE Name baudrate Parameter lt 1200 2400 4800 9600 19200 38400 gt Description Set serial port speed Parameter 1 none 2 command 3 lt gt Description Display list of available command amp general help 1 or help for a given command 2 or a detailed list of all commands 3 Name hybduplex Parameter 0 31 CHAPTER 3 717 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Description Select hybrid duplex mode O none half duplex 31 full duplex Name hybngate Parameter lt on off gt Description Switch hybrid auto noise gate on off Name 1paddr Description View or set the IP address subnet mask the gateway
97. l after sample rate conversion and input gain stage while the Hybrid Send level represents the signal after the AGC Limiter and EQ stages The Hybrid send meter can be used to see how much limiting is occurring and fine tune your level Once the nput Gain 1s selected from the Audio menu you can then view the Hybrid Send meter to see the levels after the AGC See the diagram below for details Receive Meters The right meter pair displays either the Studio Out levels Left and Right from the TWO to your console or the Hybrid Receive levels Line 1 and Line 2 from the telephone network Pressing the small button on the meter selects between Studio Out and Hybrid Receive Once again an explanation is in order Hybrid Receive level represents the level of the caller before any receive AGC action The studio out levels show the caller audio signal which is headed to your console after the equalization AGC and gain adjustments have been made See diagram below for details HOT TIP You will expect to see a wide variation in levels on the Hybrid Receive meters we ve seen over 25dB variation between different calls on the same line If you find large variations in caller levels when monitored at the Studio Out meter you should increase the Receive AGC function slightly as follows e Press the Audio button e Pressthe6 button seven times until the cursor is over the Receive AGC option and push the Select button e Usethe5 button to incr
98. ll ISDN lines without regard for such arcana as SESS DMS100 CSV CSD SPIDs etc Unfortunately the ISDN standard has been evolving for the past years and has only recently begun to settle down At their central offices the telephone companies use either AT amp T Lucent SESS Northern Telecom DMS100 or Siemens EWSD switching equipment While each will work with the TWO there are some differences which need to be taken into account when lines are ordered and used Each has a protocol the language the user equipment and the telephone network use to converse on the D channel for setting up calls and the like There is a standard protocol which all switches may provide called National ISDN 1 NI 1 This protocol was standardized and specified by Bellcore the technical lab jointly owned by the phone APPENDIX 2 114 ISDN BRI ORDERING GUIDE FOR USA amp CANADA TELOS TWO USER S MANUAL companies However both AT amp T and Northern Telecom had versions of ISDN which predated the NI 1 standard and some switches have not been upgraded to the new format There is also a newer NI 2 standard but it is designed to be compatible with NI 1 for all of the basic functions SPIDs Service Profile Identification SPID numbers are required in all but one the AT amp T protocols This number is given to the user by the phone company and must be entered correctly into the TWO in order for the connection to function SPIDs usually consist
99. ment if more than one mic is used and or more than one mix minus is required CHAPTER 2 24 INSTALLATION TELOS TWO USER S MANUAL oophisticated Mix Minus Most modern broadcast consoles have some provision for mix minus The best allow selective feeds to the phone system This is useful since sometimes you want only one mic feeding the phone sometimes you want to three or four mics during the morning show for instance and sometimes you want to play a cart machine CD or other device when callers need to hear and react to contest sound effects etc And when two hybrids are used each caller will normally need a separate mix minus since each hybrid will need to have the output of the other if callers are to hear one another actually the TWO allows for a single Mix Minus though it is less flexible see section 3 4 1 for details A simplified figure of a two buss two hybrid mix minus configuration follows NOTE NOTE This must be turned This must be turned down or AUX 2 will no down or AUX 1 will no tH longer be a mix Minus longer be a mix Minus OUTPUT OUTPUT FROM FROM HYB 1 HYB 2 UTILITY MIXER LEFT OUTPUT RI GHT OUTPUT AUX 1 OUT TO HYB 22 IN 2 AUX 2 OUT TO HYB 1 IN 2 Mic1 Caller1 Caller2 HOT TIP While we are on the subject we ll digress here for a moment Many hybrid installation problems are caused by an inadvertent signal path which creates a loop from the hybrid s output back to it s own input
100. n an analog line one discovers a problem only from a failed attempt to use the line 1 3 Mlore About the Telos TWO s Capabilities We designed the Telos TWO to be a state of the art solution for interfacing studio equipment to the telephone network It is an integrated system with a number of complementary functions that work together for maximum results Send Receive Separation This is the traditional hybrid function provided by broadcast telephone hybrids Despite ISDNs separate send and receive paths there is still the need to provide additional functions to reduce leakage the unwanted presence of the send audio in the caller output signal The reason is that almost all calls will connect with telephone sets via two wire analog lines and so there will still be a mixing of both speech directions in the telephone network When there is too much leakage there can be problems with Distortion of the announcer s audio on the air Any send audio present at a hybrid s output is different in phase and amplitude from the original signal owing to the effects of the telephone line CHAPTER 1 4 INTRODUCTION TELOS TWO USER S MANUAL impedance which varies by frequency When the original and distorted send signals mix each frequency is affected differently with varying degrees of cancellation The result is a hollow telephone like sound on the announcer s voice Feedback from acoustic coupling In the case where a loudsp
101. n it falls below a threshold On some very low level calls this attenuation may be inappropriate because you may be able to hear the caller fade away when the level falls below the threshold Audio Settings Routing Separate Hybrid Mix 12 dB Feed Thru 1 Off Feed Thru 2 Off Routing This item controls the internal mix options for the audio between the studio and the caller This feature is powerful as it can feed one mix minus to both hybrid sections thereby conferencing them together or mix the receive from both hybrids or create a stereo panned mix of the two hybrids receive audio This option is important as it CHAPTER 3 56 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL determines how many mix minus feeds you will require see section 2 5 1 for more on mix minus and the number of input channels required on the board The most popular settings for this selection are Separate where the TWO s dual hybrids are completely independent and Mix Wide Note that the Feed Thru audio path shown on the following diagrams is controlled independently of the routing option chosen Separate Routing This option provides two fully independent hybrids with the Left Studio Audio connected to Line 1 and the Right Audio to Line 2 In this mode the two callers can not hear each other except through your external mix minus configuration The diagram below illustrates this configuration Separate Routing Sand
102. n the rear panel ISDN interface using the standard phone cable provided HOT TIP The ISDN line should be connected to the smaller RJ 11 style jack Note that this jack is the top jack on the back of the TWO unlike some other Telos equipment To Telco Line Standard Modular Line Direct LED NT1 Status Normal set up in the USA amp Canada The U jack connects directly to the Telco line and the S T jack is unused ISDN U interface connector USA amp Canada only PIN FUNCTION Line R Line T N C N C ISDN U interface connector as provided on units shipped to the USA amp Canada Note the polarity of the line connections normally does not matter Looking into the jack with the pins oriented at the top pin 1 will be to the left CHAPTER 2 12 INSTALLATION TELOS TWO USER S MANUAL IMPORTANT As with any piece of modern electronic gear it is advisable that precautions be taken to prevent damage caused by power surges Standard telephone line surge protectors can be used to offer some degree of protection at the U interface jack It is the user s responsibility to ensure that adequate protection is provided The Telos TWO s S T interface is always active and may be used to parallel additional ISDN terminal equipment such as an ISDN telephone set to the line The internal NTI operates just as if it were an external box in order to permit this to occur To ISDN Network TWO USA ISDN
103. ne network routing each channel appears to be a separate line with it s own number and independent dial out capabilities Since each has to be dialed or answered separately they appear to be lines to users also We refer to a B channel as a line on the TWO s menus and LEDs The system s internal ISDN interface sometimes called by it s generic name Terminal Adapter is used to connect to digital ISDN telephone lines It easily adapts to the various types of service offered by the range of Central Office CO switches installed by telephone companies in the USA and Canada Ordering ISDN Dealing with the Phone Company As is often the case when broadcasters interface with phone people the lines of communication on ISDN can get a little tangled The first order of business is to find someone who knows what ISDN is While your usual account agent will be the normal entry point you will may be talking to a number of phone people before you find one who understands your needs Some of the regional Bell companies offer a single point of contact number for switched digital services while some Telcos use resellers Note that in some cases the phone company will need to do a loop qualification line loss test before they can verify that ISDN will be available at your location Here are some contact numbers we use if you have particularly positive or negative experiences with these offices please let us know TELOS TWO U
104. nt to see if an item changed you should refresh the screen by pressing and then AES Input Status Consumer or Professional mode Indicate sample rate The rate shown in the AES header Measured Sample rate The actual sample rate of the incoming AES EBU data stream C S Data The raw AES EBU header information in hexadecimal format Miscellaneous 1 This screen groups various miscellaneous status items Parallel port output Displays the state of each of the five parallel port outputs Parallel port input Displays the state of each of the four parallel port inputs Reboots The number of times the system has been rebooted since the last cold boot PLL Report the status of the internal PLL clock which locks to the ISDN line This should read Locked Miscellaneous 2 DSP software Up time This displays the times since the last warm boot or power cycle This value is only updated when this screen is first displayed It displays this in the format Days hours minutes seconds Unit Name Reserved for future use CHAPTER 4 93 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL Using Loop Modes for Troubleshooting Loop Mode This item allows the Telos Two to loop audio from various points in the system Off This is the normal operating mode No loopback path is turned on The Send to caller Input is sent as send audio and caller audio is presented at Output caller St
105. nue Reduces feedback when a loudspeaker is necessary Because the ducking system operates on both audio paths and because we designed it to be symmetrical in its gain reduction action the feedback gain is kept constant and is reduced by the amount of the ducking level selected In the loudspeaker case reduces audibility of the caller signal that couples through the acoustic path into the microphones and is returned the caller resulting in a more natural sound for the caller The duplex system inserts a controlled loss ducking into whichever audio path send or receive is not active at the moment When the caller is speaking this loss is inserted in the announcer path when the announcer is speaking the loss is inserted in the caller gain is reduced The effect 1s somewhat seesaw like with the total loss always being constant As a guideline you will need a lower DuplexLevel setting when using open speakers This helps reduce the occurrence of feedback and also reduces the chances of the caller hearing themselves via the speaker to mic path which has an unnatural quality and can be disturbing In a morning zoo type of scenario the setting should be even lower as there will be multiple mics used with open speakers Fortunately this scenario coincides with a more duplex style of operating where pre recorded bits may be played to callers and must be heard without interruption The default setting is 10
106. nything to work We ve seen cases where it was given incorrectly by Telco personnel so it might be a good idea to re check with them if things are pointing in this direction HOT TIP If you suspect the SPIDs given you are wrong or the basic line provisioning configuration is incorrect call the Telco and simply ask to speak to someone who can log into the switch They will probably need to have someone call you back Only once you have this person on the line and they are logged into the switch ask them to look at the SPIDs programmed there If they can t log into the switch ask for someone who can Also get this person s fax number and send them the ISDN ordering information form the Appendix of this manual Sometimes the information in the business office computer is wrong By verifying what is programmed into the actual switch you can save time We ve included some useful diagnostic aids in the hybrid to help you determine where a problem is originating A good starting point is the ISDN status accessible on the LCD by pressing the Status button ISDN Status This screen shows the status of the ISDN connection and the Telco type selected You can determine if the line is connected and whether the line and the Telos TWO are successfully configured In addition information about calls 1s displayed here One of the following status words will be shown for each active ISDN channel Deactivated No line connected or connected
107. o report a service or option not available only when no other cause in this class applies Cause No 65 Bearer Capability not implemented Incompatible bearcap This cause indicates that the equipment sending this cause does not support the bearer capability requested Cause No 66 Channel type not implemented This cause is returned when the called party has reached a channel type not supported Cause No 69 Requested facility not implemented This cause indicates that the network or node does not support the requested bearer capability and therefore cannot be accessed at this time Cause No 70 Restricted only This cause indicates that the calling party has requested an unrestricted bearer service but the equipment sending this cause only supports the restricted version of the requested bearer capability Cause No 79 Service or option not implemented unspecified This cause is used to report a service or option not implemented event only when no other cause in this class applies Cause No 81 Invalid call reference value This cause indicates that the equipment sending this cause has received a message with a call reference which is not currently in use on the user network interface This value only applies if the call reference values 1 or 2 octets long and is not the global call reference Cause No 82 Identified channel does not exist This cause is sent when the equipment sending this cause has received a
108. precision 48kHz clock derived from the ISDN line e AES IN AES Output is synchronized to the clock frequency of the AES EBU source connected to the AES EBU input Even if you are using the analog inputs the AES EBU input can be fed a reference signal to provide output synchronization Output Gain This item adjusts the gain to both the Studio Analog and AES EBU outputs The value is in dB relative to 4 dBu on the analog outputs and 16 dBfs dB relative to full scale on the AES output The default value is O dB The system allows for 13dB before clipping so the clipping point can be determined by adding 13 to the readings below The following table shows the relationship between the Output Gain setting and the output levels CHAPTER 3 53 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Output Gain Related to Output Levels Output Gain Setting 11 4 0 4 Analog Output Level nom 7 dBu 0 dBu 4 dBu 8 dBu AES Output Level 27 dBfs 20 dBfs 16 dBfs 12 dBfs Duplex Level This control adjusts the amount of ducking that occurs to the received telephone audio based on the level of send to caller audio A value of 0 means that the telephone audio is not ducked full duplex or attenuated while 16 applies full attenuation when send audio is present half duplex Section 3 6 has more information on this function This function is desirable for a variety of reasons Allows the announcer to override the caller by cau
109. r attenuation when the host speaks We have taken care to design the time constants of this operation so that the audibility of the gain change 1s masked by the send audio Hum Filtering The Hybrid has a high pass filter that minimizes AC mains hum while preserving relevant audio frequencies The cross over point is 250Hz Caller ID ISDN naturally conveys caller ID information transmitting it instantly in the setup message The information is available on the Hybrid s LCD display as well as being accessible remotely While analog lines can have caller ID capability ISDNs is much faster than the 1200 baud modem method used for analog lines CHAPTER 1 6 INTRODUCTION TELOS TWO USER S MANUAL Conference Linking The Telos TWO makes possible high quality conferencing between the two possible callers The routing option allows for mixed modes so that when desired you can create conferences without external equipment CHAPTER 1 INTRODUCTION TELOS TWO USER S MANUAL 2 INSTALLATION 2 1 Getting Started The Telos Two mounts in a 2RU high space in a standard 19 rack You do not need to pay special attention to cooling or ventilation as the unit generates little heat The unit will operate on any commonly available AC mains voltage between 90 and 240 volts AC 50 60 Hz You will want to mount the unit in a position convenient for user access unless you plan to use a means of remote control Next you will need
110. r a Maalox and Rogaine addict You can t fix any system without the right world view a zeitgeist of suspicion tempered by trust in the laws of physics curiosity dulled only by the determination to stay focused on a single problem and a zealot s regard for the scientific method Perhaps these are characteristics of all who successfully pursue the truth In a world where we are surrounded by complexity where we deal daily with equipment and systems only half understood it seems wise to follow understanding by an iterative loop of focus hypothesis and experiment The notions here apply whether you are solving problems at the system level or at the component level At the system level the actions you might take would be very different checking cables trying different menu settings but the thinking is the same Too many times we fall in love with our suppositions We are quick to overtly or subconsciously assume the problem being chased is due to lousy design the stupid phone company or the manager s latest memo Armed with a healthy skeptical attitude the basic philosophy of troubleshooting any system is to follow these steps Observe the behavior to find the apparent problem CHAPTER 4 91 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL Observe collateral behavior to gain as much information as possible about the problem Round up the usual suspects Generate a hypothesis Generate an experimen
111. r network connections and TCP IP setup options from the System menu You may wish to check with your network administrator and make sure the IP address entered are not being used by some other device on your network If the problem persists contact Telos Technical support HOT TIP If you get the error Cannot resolve host name the problem could be anything from your IP settings to your network cable If the green LED on the 10Base T connectoris not lit then you are probably not connected to a working network hub Commit Software This menu brings up a query window which states Are you sure you want to commit the secondary software for permanent usage If you do not wish to do so you should press Select or any of the Menu keys to abort If you do wish to do make the new software your Primary software press or Y to highlight yes and then press Select to begin the process The software version in the Primary bank will be deleted in this process In order to prevent you from making software from a faulty download your Primary software you can only perform this operation when running the Secondary software version If the secondary software will not execute for some reason this protects you from deleting your primary bank software unless the downloaded software is capable of successfully operating CHAPTER 3 74 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL HOT TIP If you get the error Cannot perform oper
112. referred to as 2B 0D rather than 2B D D channel packet service is not widely available and is not used by the TWO or other Telos equipment Data and Voice ISDN lines may be used for voice signals encoded in standard fashion to allow inter working with analog telephones or may be used to transmit digital data streams The latter mode is used for such applications as high speed Internet access It is also the mode used with MPEG codecs such as the Zephyr and ZephyrExpress In this case the ISDN line may be carrying voice signals but is doing so in a format that is not compatible with the analog part of the telephone network The distinction a voice call and a data call is made in the automatically conveyed Setup message that begins each call CHAPTER 2 10 INSTALLATION TELOS TWO USER S MANUAL DEEP TECH NOTE The voice mode may well be able to transmit digital data and some Telephone Companies charge more money for data capability That is why some ISDN modems have a special data over voice option that fools the central office into billing as if it were a voice connection Normally the Telos TWO uses only the voice mode circuit switched voice or CSV so data capability is not necessary Of course you may use a line with both capabilities with the TWO at any time Just be sure the line supports voice as well as data HOT TIP If this line may be borrowed at times for use with an audio codec such as the Telos Zep
113. rges Don t forget to drop this call once your testing and configuration are complete 2 8 2 Levels Levels Levels Ok we assume that you just made a call to yourself in section 2 8 1 above if not please follow those steps now Congratulations you just have some tweaking to do and your basic installation will be complete Bring up some audio on the console mixing desk Spoken word is best as it tends to have a lot of dynamics but music will work While tone will work for the coarse adjustments we do not recommend using it for final adjustments Adjust the levels on the board to the levels set by your typical user For now make sure the faders for both of the hybrids are TURNED OFF HOT TIP If your board operators typically run into the red you should do the same Set the left LED meter on the TWO to STUDIO IN if necessary by pressing the button located on this meter You should see the audio from your console on these meters the send to hybrid 1 audio will be on the LED bargraph labeled and the send to hybrid 2 will be on the LED bargraph labeled 2 Observe the levels on these two meters You will note that the peak reading is represented by a floating LED that persists at the top of the meter Since our goal is to set the levels so that peak levels do not hit OdBfs this peak reading is what we need to watch Section 3 2 has more information on the TWO s metering First set the Input Gain selection to a
114. s Line Type Basic Rate Functional EKTS No Call Appearance Handling No Non Initializing Terminal No Circuit Switched Service Yes Packet Switched Service No TEL Dynamic Bearer Service CSD CSV on both channels CSV only is acceptable if otherwise specified by user 10XXXXX Long Distance Prefix Yes Give us 1 Two SPID numbers depending upon number of active B channels 2 Two Directory Numbers APPENDIX 2 118 ISDN BRI ORDERING GUIDE FOR USA amp CANADA TELOS TWO USER S MANUAL PROTOCOL AT amp T Point to Point Custom Software version 5E4 2 and above CO Values Line Type DSL class Point to Point PTP B1 Service On Demand DMD B2 Service On Demand DMD Maximum B Channels MaxChan 2 CSV Channels Any Number of CSV calls 1 CSD Channels Any CSV only is acceptable if otherwise specified by user Number of CSD calls 2 Terminal Type A Number Display No Call Appearance Pref Idle 10XXXXX Long Distance Prefix Yes Turn off features such as packet mode data multiline hunt multiple call appearances Electronic Key Telephone Sets EKTS shared directory numbers accept special type of number intercom groups network resource selector modem pools message waiting hunting interLata competition etc Note for AT amp T Lucent 5ESS on loop extended lines REX test must be disabled for this line using one of the following ASDFI266 Prohibit REX on BRI lines per office or ASDFI267 Prohibi
115. s own audio See illustration 2A CHAPTER 2 21 INSTALLATION TELOS TWO USER S MANUAL o gt MICRO PHONES e UTILITY BUS LINE CHANNELS PHONE CHANNEL PROGRAM Do um PROGRAM BUS MIX MINUS TIP This arrangement is very flexible as it allows the operator to place any or all sources in Utility for the caller to hear Also if the talent wishes to talk about the caller without him her hearing the talent s microphone need only be taken out of Utility to do so The only drawback to this approach is the potential for the operator to accidentally put the hybrid in Utility in which case it is no longer a mix minus CHAPTER 2 22 INSTALLATION TELOS TWO USER S MANUAL Example 2 Using a utility mixer A general purpose utility mixer is used to record interviews off the telephone line using a single hybrid The mixer s main bus is fed to the recording device Both the microphone and the hybrid will be brought up on the faders so the interview can be recorded Again we will use a second buss to feed the hybrid In this case we will take the Aux 1 output to feed the hybrid We will turn up Aux 1 for the microphone but we will make sure it is turned fully off for the input channel with the caller audio NOTE This must be turned down or AUX 1 will no longer be a mix minus OUTPUT FROM HYB 1 UTILITY MIXER LEFT OUTPUT RI GHT OUTPUT AUX 1 OUT TO HYB 1 IN AUX 2 OUT T
116. se No 3 No route to dest Prefix 1 dialed in error This cause indicates that the called party cannot be reached because the network through which the call has been routed does not serve the destination desired This cause is supported on a network dependent basis Or A 1 was dialed when not required Redial without the 1 Cause No 4 No prefix 1 Special Information Tone The prefix 1 is not required for this number or This cause indicates that the called party cannot be reached for reasons that are of a long term nature and that the special information tone should be returned to the calling party Cause No 5 Misdialed trunk prefix National use This cause indicates the erroneous inclusion of a trunk prefix in the called party number Cause No 6 Channel unacceptable This cause indicates a called user cannot negotiate for a B channel other than that specified in the SETUP message Cause No 7 Call awarded and being delivered on an established channel This call indicates the user has been awarded the incoming calls and that call is being connected to a channel already established to that user for similar calls e g packet mode X 25 virtual calls etc CHAPTER 4 100 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL Cause No 8 Call is proceeding Preemption Call in process please standby Or This cause indicates a call has been preempted Cause No 9 Preemption reserved This cause indi
117. se for alarm Are you using the TWO s internal NT1 USA amp Canada only The LED indicator of the status of the NTI is on the rear panel near the U jack If the line is inactive the LED will remain in the rapidly flashing state This state indicates a loss of the ISDN line at the lowest physical level Try another telephone cord or try the TWO on another line Or try another ISDN device on this line If NT1 can contact the central office the LED will blink slowly about 1 Hz If the LED remains in this state there is an internal ISDN problem or you could be connected to the wrong jack on the back Users in USA amp Canada should be using the smaller RJ11 style jack The LED will come on solid when all handshaking is completed and the basic low level line connection is good If the LED stays on with the ISDN disconnected or does not come on at all there is a hardware problem Are you using an external NT1 If so check the LEDs on the unit They will usually have one or more lights for instance Power Should be lit Normally outside the USA amp Canada power for the NT1 is provided by the Telco Make sure this cable is installed to the proper connectors Active Lights green when all is well Terminal Error Lights red to indicate a problem on the terminal TWO side Usually means a hardware problem with the TWO but could be a cable problem Line Error Lights red to indicate a problem with the Telco line
118. selection off will prevent the tone from being sent Under those circumstances the hybrid sections will adapt only when send to caller audio is present If this option is off the announcer audio during the first few syllables of send to caller audio may sound hollow or tinny as adaptation takes place CHAPTER 3 61 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL 3 4 2 The TEL Menu This menu consists of selections that adjust things associated with the telephone line such as ISDN setup parameters i ISDN Settings TN Auto Answer On SPIDI none SPID2 none DNI none Auto Answer When enabled the TWO automatically answers and connects to incoming calls SPID1 When you are using Natl I or DMS 100 for your Telco mode you must enter the correct Service Profile ID SPID number here Normally the Telephone Company tells you this number when you order the line Often it is found written on the line jack or punch block SP D corresponds to Line 1 Usually the SPID is the area code4 phone number 0101 However we have seen some that include a two digit prefix and a two digit suffix and many other variations are possible See the Appendix for a list of known working SPIDs listed by Telephone Company Despite the last paragraph you cannot assume anything about the SPID If the above advice works consider yourself lucky if 1t doesn t work there is no substitute for getting the correct SP
119. sidual hybrid leakage This allows for considerable amounts of gain on low level callers while preserving excellent hybrid performance CHAPTER 3 54 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL HOT TIP The Telos TWO s status screens include a meter that shows the activity of the Rev AGC It can be helpful to check this meter after adjusting these this setting To view Rcv AGC levels Press the Stat button Usethe5 or6 buttons to scroll through the status screen until you see Hybrid 1 Status or Hybrid 2 Status as required The second bargraph meter from the left on the LCD screen will show AGC activity on the Hybrid Rcv audio Audio Settings Receive EQ Fix Adapt Rev EQ Low HIHI2 O dB IIIN Rcv EQ High HIHI2 O dB IIIN Noise Gate On Receive EQ Dynamic Digital EQ DDEQ Telephone audio frequency response varies widely as many factors can effect it we ve measured the response on a number of calls and the results were revealing Consequently some form of receive equalization is desirable See section 3 6 for additional information The Receive EQ selection controls the type of equalization applied to the received telephone audio as follows E Off The caller audio 1s passed through without modification The Rcv EQ values see below are ignored in this mode Fixed This is a simple manual equalizer mode where EQ values selected for LF and HF are applied constantly Adaptive Dynamic Digital Th
120. sing the received caller audio to be attenuated ducked when the announcer speaks This is often desired for aesthetic effect and allows the announcer to remain in control of the conversation Permits open loudspeaker monitoring of callers with reduced feedback or problems Dynamically improves apparent trans hybrid loss to reduce send to receive leakage when necessary Receive AGC The Receive AGC section serves to improve level consistency of incoming caller audio Nominal levels of the telephone network vary as much as 30dB from call to call The Telos TWO uses a dB linear approach to AGC with a feed forward topology This provides a consistent sound regardless of the drive level The smart compressor approach used normalizes levels while retaining the natural dynamics of the caller s voice This selection controls the aggressiveness of the AGC process taking values from 0 off to 15 max Values of above 7 are quite aggressive so we suggest you start off with a value below 7 More aggressive AGC is more audible but is also more effective at maintaining consistent levels Adjustment of this setting simultaneously changes as number of parameters within the AGC function such as attack amp release times thresholds and compression ratio An important feature of the TWO s AGC is the fact that it is cross coupled to other sections of the hybrid so that it can reliably distinguish between the real caller audio and re
121. ssible unless the network provides it IMPORTANT Because it is dependant on the configuration of your ISDN circuit this feature probably will not work unless you have ETS 300 Euro ISDN for your ISDN protocol When using a USA ISDN protocol the Hold button serves to mute the inputs and outputs to the selected hybrid Calls cannot be moved from the TWO to an ISDN telephone in this case DEEP TECH NOTE This button issues the Suspend command to the network We chose to name it Hold for easier understanding Calls held may be resumed taken off hold either on the Telos TWO or with another terminal The Resume button tells the telephone network that you want to retrieve a call that has been put on hold If there are two active calls the Line buttons determine which is affected This provides a way to move calls from an ISDN telephone set to the hybrid for example Generating DTMF tones When a call is active you can use the keypad to generate DTMF touchtones The purpose is to be able to use voice mail systems and the like In order to use this capability the Line buttons must be used to choose the active line for which the tones are to be sent CHAPTER 3 46 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL HOT TIP If the Line selected has no active call the dialing process will be initiated rather than sending the DTMF tones Accepting Incoming Calls When the Telos TWO receives a
122. sted using the Audio menu Input Level selection You will need to set these according to the levels expected at the Hybrid input When in the studio in position the left LED level meter indicates the level after the menu adjustment but before any of the Hybrid s digital level adjustments See section 3 4 1 for additional information CURIOSITY NOTE The Telos TWO has the more common pin outs used for three pin XLR inputs amp outputs You can easily remember the correct signals when wiring connectors using the phrase George Washington Bridge Pin 1 G Ground Pin 2 W White typical color in mic cable if there is no white there will be a red conductor and Pin 3 B Black CHAPTER 2 28 INSTALLATION TELOS TWO USER S MANUAL 2 5 3 Output From Caller Left amp Right Audio Output Caller 1 2 PIN FUNCTION 1 Ground 2 Audio 3 Audio The analog audio outputs have the following characteristics Active differential Output level 7 to 8 dBu nominal See section 3 4 1 for setting this parameter Clip point 21dBu Impedance lt 60Q x 2 If a single ended unbalanced output is required connect between ground and either of the output pins Do not ground the unused pin 2 5 4 AES EBU Digital Audio In Out Ground Output Output 0 AES EBU Input amp Output Connections These are inputs and outputs for AES EBU format digital audio signals CHAPT
123. sten to the caller audio We have found the best scheme using speakers is to have the phone monitor speaker mute when the mic is turned on If your mix minus allows for the mic signal to be active even when the mic channel 1s turned off 1 e from a preamp or pre mixer the system can be used like a speaker phone when the taking calls off air When the call is on the air the speaker mutes however the talent will generally be wearing headphones when on mic in any case CHAPTER 3 86 OPERATION amp DETAILED REFERENCE CHAPTER 3 TELOS TWO USER S MANUAL OPERATION amp DETAILED REFERENCE 87 4 Technical Data and Troubleshooting 4 1 Overview A consequence of modern surface mount construction is that it is no longer possible for local repairs to be made Special and expensive equipment is required to change parts As well today s equipment is very complicated and requires repair technicians to have detailed experience and training and have access to high end test equipment At the same time the advent of overnight delivery services means that equipment can be returned to the factory for quick turn around repair Therefore we do not expect you to fix this unit at the component level and we do not include schematics of the unit in the manual Please see page I of this manual for proper procedures on returning units for repair There is the possibility however that you could repair the unit by swapping subsystems such as plug in mo
124. t REX on BRI lines per line Give us 1 One Directory Number PROTOCOL AT amp T Point to Multipoint Custom Not supported by the Telos TWO Please provide National ISDN or AT amp T Point to Point Custom APPENDIX 2 119 ISDN BRI ORDERING GUIDE FOR USA amp CANADA TELOS TWO USER S MANUAL Manual History 1 SC 7 99 1 0 RKT 01 00 APPENDIX 2 120 KNOWN WORKING SPIDS BY TELEPHONE COMPANY
125. t to test the hypothesis Fix the problem Then repeat if necessary to attack additional problems Let us now cover each step of the troubleshooting sequence in detail Step 1 Observe the behavior to find the apparent bug In other words determine the bug s symptoms Remember always that many problems are subtle and exhibit themselves via a confusing set of symptoms Step 2 Observe collateral behavior to gain as much information as possible about the problem Does the LCD s problem correlate to an LED flashing Try to avoid studying a problem in isolation but at the same time be wary of trying to fix too many things at the same time No one is smart enough to deal with multiple problems all at once unless they are all manifestations of something more fundamental Step 3 Round up the usual suspects At the system level always suspect the menu set up the cables the Phone Company line setup the punch blocks etc At the component level many computer problems stem from the same few sources Never never never forget to check all power supply voltages right at the motherboard Step 4 Generate a hypothesis Before changing things formulate a hypothesis about the cause of the problem You probably don t have the information to do this without gathering more data Sometimes you will have no clue what the problem might be Sometimes when the pangs of desperation set in it s worthwhile to try anything practically at random Yo
126. t to the button indicates which line you have selected You use the keypad buttons to dial a telephone number not stored in memory At any time an ISDN channel is free simply begin to enter the number you want to dial Upon entering the first digit the dialing screen will appear so that you can see the number as you enter subsequent digits When you have entered all of the digits press the Send button to actually start the call This is similar to the way a cell phone or fax machine operates ISDN processes your call request and the LCD display indicates the call status CHAPTER 3 44 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Waiting The TWO has requested a call from the network The Telco switch has not yet confirmed that it has received this message Calling The TWO has requested a call from the Telco switch and the switch has confirmed that the call setup message was received Call Proceeding The Telco is awaiting confirmation from the long distance network on how to route the call Call Ringing The far end terminal has received information about the incoming call and is generating an alert ringing signal Connected The far end terminal has accepted the call and you are now ready to go DEEP TECH NOTE This method of sending digits called en block is one of the reasons ISDN calls go through so quickly Unlike dialing on an analog line the telephone switch receiving the
127. tal lines convey the bits precisely and accurately from the network to your studio equipment without any perturbation so the audio remains clean Call Setup and Supervision are Better Analog lines use a strange mix of signaling to convey call status Loop current drop and returned dial tone signal that a far end caller has disconnected blasts of 100 volts at 20 Hz mean someone wants you to answer Why should we be using a mechanism designed to bang a hammer against a metal bell to transmit network status information in the year 2000 ISDN uses a modern digital approach to controlling calls and conveying status information about them The sophisticated transactions on the D channel are able to keep both ends of a call accurately informed about what is happening For starters ISDN call set up times are often only a few 10 s of milliseconds enhancing production of a fast paced show Perhaps more importantly when a caller disconnects while waiting on hold the ISDN channel communicates this status change instantly This contrasts with the usual 11 second delay on most analog lines One of the most common complaints of talk hosts is that they go to a line where they expect a caller to be waiting only to be met with a blaring annoying dial tone The chance of this happening with an ISDN line is nearly zero CHAPTER 1 3 INTRODUCTION TELOS TWO USER S MANUAL Another common error is the condition where a talent punches up a line that looks free
128. talent needs to hear the callers pre delay All perceptual codecs Such as the Zephyr or ZephyrExpress have too much delay for talent at remote locations to hear themselves via a round trip loop Therefore another mix minus is required to feed the codecs The talent hears callers via the codec return path As before you feed this return with mix minus a mix of everything on the program bus minus the remote audio As for the second half of the equation the callers hear the talent because the remote feed is added to the telephone mix minus bus This is no problem if you have a set up that permits selective assignment to the hybrid mix minus MIX MINUS TIP If you cannot create a separate mix minus for occasional remotes you may be able to borrow one of your hybrid mix minuses and console input for the duration of the remote Just make sure that your operators understand that only one of the two hybrids is active A problem with this arrangement is a result of a hybrid with too much leakage combined with the system delay If the hybrid isn t doing a good job of preventing the send audio from leaking to its output the special remote send mix minus is corrupted Remember if any of the announcer audio from the remote site is returned via the monitor feed it will be delayed by the digital link causing an echo effect The Telos TWO really shows its stuff in this situation Because it has so much trans hybrid loss the leakage is
129. ted eco exnvauVs SENRHEHRANHSSRENR aana aa ANN RN EENUEERNEN ME REEKIKREIERNVENENNERNM TENERE 8 2 2 ISDN Technology TO T uiias suausaa Eau E SaaER dE CHA AN NSEN WEN Naia 8 2 3 Ordering ISDN Aic svevusvi x wis vi ERNENNRUERNEERERINANRHREERNREFRNERER SN QUERENS UARERERERENFE E NVRER CR NM EE VER 10 2 4 Connecting the Telos TWO to ISDN crecer eere eren n nennen unn unn unn un 11 2 4 1 USA amp Canada Using the U and S T Interface 12 2 4 2 Worldwide outside the USA amp Canada The S T Only Interface 14 2 4 3 ISDN Setup icossisuex nua Sas uEREEV a VEU MEN MENS MN A RUE aAA ARa aAa a aaan 17 2 5 Studio Audio Connections eoru annua uuaauuauuuuuuauuauRRRSRRSESESEESEESESESEEESEESRRERE 21 2 5 1 NIDXCMIBUS rus acc SEV uHR ERE E NEG KE MENORES SENE a CONI NMINRE NU 21 2 5 2 Input Send to Caller Left amp Right Analog Audio 27 2 5 3 Output Caller Left amp Right Audio cce eee eee erre rn nn nnn 29 2 5 4 AES EBU Digital Audio In Out eere e oen u nana uuauuuuuuuuuuuuuuuuuuunu usa 29 2 6 AG POWER iiec ced iua s uuRuRUMEVERNNERNUNRVENREAEESNINSKEEKVENUNENVEEMINNM EE NENEHAWENS VORNE ERN RR VEMM K UE 30 2 7 Remote Control Ports c crore enean uuauuuauuaauuuuuuuuuRRuRSRRRSESRSSESSSESEESSSERESESRERRHER 31 2 7 1 Parallel GPI Remote Control
130. that you can also Telnet into the system if you prefer See section 3 5 2 for details First connect the TWO to a computer s serial port Since the TWO has a DCE interface you will need to use a straight through cable The default bit rate for the TWO s serial port is 19200 although that can easily be changed from the System menu You will be using a computer Terminal Emulation program such as Windows HyperTerminal or ProComm for IBM compatibles or White Night or others for the Mac Configure this software to 8 bits no parity and 1 stop bit Set the bit rate may CHAPTER 3 75 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL be called baud rate to match the Serial Bitrate setting in TWO s System menu selection Since HyperTerminal comes with windows we will give you some tips on using this particular software Other software will have similar configuration options Click on the new button on the tool bar You may see a prompt asking if it is ok to continue click ok You should now see a Connection Description dialog box requesting you name the setup and select an icon Enter the desired name such as Telos TWO on com 2 and click on an icon we like the electron symbol which is last but any will work Now click on ok You will now see a Phone Number Dialog box Enter the following information e Country code Setting does not matter e Area Code Setting does not matter e Phone Number setting do
131. the audio from the phone line on these LED bargraphs since we are connected Line 1 to Line 2 the channels will be reversed The audio sent to hybrid 1 will return on hybrid 2 and will be on the LED bargraph labeled 2 and the audio sent to hybrid 2 will return on hybrid 1 and will be on the LED bargraph labeled 7 Bring up the fader for hybrid 1 on your console Adjust the TWO s Output Gain adjustment found in the Audio Settings screen or the input trim on the board to give proper levels at the console This sets the level for both outputs Once you have set hybrid 1 pull that fader down and bring up the fader for hybrid 2 If the sources are not reading identically you will need to adjust the input trim of the console on one of the two input channels to balance them out You can now drop the call you made in the previous section Push the Line 1 button now and then press Drop 2 8 3 Time to test it out Ok you made it Another 15 minutes and you can go home for the day First we will check that the mix minus for each hybrid is correct Then we will make a test call Press the Line 1 button to select that line for dialing Enter the phone number for a telephone line which has audio present using the dial pad calling either the time or weather number works well for this Press Send to make this call Bring up hybrid 1 on the console mixing desk You will hear the audio from the phone line Look at the left meter on the TWO
132. ting ones removes printing modes 2 switches off debug printout These log modes are mostly intended for use when troubleshooting problems Telos Customer Support may ask you to enable one or more log mode Here s a brief description of what each does dgb Provides general system information ext Provides extended system debug information isdn Provides general ISDN activity information CHAPTER 3 79 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL 112 Provides the raw ISDN Layer 2 and Layer 3 protocol information and decodes this information Protocol analyzer mode 113 Provides the raw Layer 3 protocol information iie Decodes Layer 3 information if 113 has previously requested istk Provides ISDN debug codes relating to the ISDN protocol inside the TWO all Turns on all of the above When used before one of the above commands turns off that command while leaving the others active When used before one of the above commands turns on that commands while leaving the others active none Turns off all logging DEEP TECH NOTE The log feature is a very useful command when troubleshooting problems The ISDN il3 il2 and iie parameters in particular can be useful if ISDN line compatibility problems occur Usually you will be logging at the request of Telos Technical Support and should follow the instructions given For more information on ISDN troubleshooting see Sec
133. tion 4 Name login Parameter password new password gt Description Log into the command interpreter or change password Use to substitute for an empty password when changing Parameter Description Log off from the command interpreter Name nvi Parameter Description Display NV RAM key name and boot cycle Count POMC PEDES reset Parameter cold pm assert fatal CHAPTER 3 80 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Description Restart software by letting the watchdog bite Option cold forces a reset with global parameter reset pm trigger a pmdump due to access error fatal calls TDEASSERTU fatal issues a reset by writing to fatal Name touchtone Parameter lt lineQ linel gt text string Description Send touch tones to selected mix bus line The string may contain numbers 0 9 A F and Other characters are ignored Name unlock Parameter Description Unlock a password protected front panel Name version Parameter 1 none 24 Sel gt Description TTYprint normal 1 or extended 2 version Inrormatror 22 3 5 2 Ethemet 10Base T control System Control using Telnet You can also access the TWO s command line using Telnet Using Telnet to access the command line interpreter First you must program the following information into the TWO e IP Address e Subnet Mask
134. to Order or confirm availability of an appropriate ISDN BRI line Connect the ISDN line Connect audio via either analog or digital AES EBU Connect to power Connect to remote control if used Configure the Hybrid to match your ISDN line Configure the Hybrid s audio characteristics for the requirements of your installation Test to confirm proper operation This chapter will give you a guided tour of the input output connectors of the TWO You may wish to go ahead and connect the various signals as you work through this chapter Next in Section 2 8 we walk you through system testing Once the system is up and running you ll want to read Chapter 3 for detailed information on operating the TWO and detailed descriptions of each menu item We start out with a detailed discussion of ISDN since this technology may be new to some users If you are already familiar with ISDN technology you may skip ahead to section 2 4 now 2 2 ISDN Technology 101 This section offers an introduction to ISDN service It will be useful to help you understand how to order ISDN and use it with the hybrid ISDN lines come in two varieties Basic Rate Interface BRI SO or ISDN 2 and Primary Rate Interface PRI or S2 or ISDN 30 BRI lines are the kind we normally see in broadcast stations as these are what are used with MPEG codecs such as the Telos Zephyr and ZephyrExpress BRIs have a capability of one or two 64 KBPS channels Since the
135. tus of the ISDN connection Looking here you can determine if the line is connected and whether the line and the Telos TWO are successfully configured In addition information about the status of calls is displayed here One of the following status words will be shown for each active ISDN channel Deactivated No line connected or connected to wrong jack on the TWO Or ETS 300 permits the Telco to put a line to sleep Deactivated will be displayed when this occurs Ready The units sees a live ISDN S interface i e external NT1 is present or internal NT1 has completed startup Wait SPID has been sent to network DMS Cust amp Natl l 1 only CHAPTER 3 49 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Waiting Outgoing call in process Request for call has been sent to Telco Call Proceeding Outgoing call in process Telco switch waiting for routing info from network Calling Outgoing call in process Telco has acknowledged the call request Ringing Outgoing call in process far end has generated a call alert signal Disconnecting Request to disconnect has been made awaiting acknowledgment Accepting Call TWO has accepted and incoming call and is waiting for Telco to connect Hybrid 1 Status This screen displays information about the operation of the send and receive AGC and Dynamic Equalizer for Hybrid 1 There are meters showing the activity of Send AGC limiter gain reduction Receive AGC gain reduction in
136. u might find a bad plug an unconnected line or something unexpected Look around but be always on the prowl for a working hypothesis Step 5 Generate an experiment to test the hypothesis Change the ISDN connection to a known good line call known good phone or hybrid at the other end if long distance doesn t Work try a local call NOTE You should plan your tests to eliminate 50 of the possible problems in one test if possible Just keep careful track so you know what you have eliminated Step 6 Fix the problem CHAPTER 4 92 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL A Final Thought Constantly apply sanity checks Twenty five years ago the Firesign Theater put out an album called Everything You Know is Wrong Use that as your guiding philosophy in troubleshooting a Telos TWO set up For example just because you checked the Telco line last night and it was fine does not mean that it s OK now At 3 00 AM when the problems seem intractable and you are ready to give up engineering remember that the system has worked and will work Never panic you are smarter than it is The Debug Status Screens There are a number of screens that can help you find a problem These are visible by pressing the Status button and then using the arrow buttons to cycle through the available screens Note that the status of items on these screens is only updated when the screen is displayed If you are troubleshooting and wa
137. udio This loops the AES EBU input and analog signal inputs after Analog to Digital conversion back to the AES EBU output and analog output via the Digital to Analog converter With this mode engaged you can make signal to noise THD and frequency response measurements through the system to check the input and output Stages 4 4 Troubleshooting ISDN Problems Condition Can t Get ISDN Ready Indication First try disconnecting the ISDN line and waiting a full 120 seconds leave the TWO on and then reconnect the line What kind of ISDN do you have and is the TWO set to match it The telephone company should have given you the ISDN protocol when the line was ordered If you find yourself in the field without this information it is usually possible to piece together what you need CHAPTER 4 If you are given SPIDS you probably have Natl I1 or DMS Cust for your ISDN protocol One SPID means one channel was activated rather than the usual two No SPIDs and only one phone number generally means AT amp T Cust In Europe you have either ETS 300 Euro ISDN or in rare cases the local protocol such as ITR6 in Germany or VN2 in France The TWO only works with ETS300 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL In the case of Natl I 1 or 2 and DMS 100 carefully verify that you have the correct SPID from the Telco and that you have properly entered it into the Telos TWO It must be correct in order for a
138. uruuruRE 100 4 5 The Terminal Command Interpreter ce eee nnn u nnn unuuuauuuuuuuuuuuuu uuu uEa 106 5 SPECIFICATIONS crore reor unu ununi uuu u nuu nuunuunuunuunuunussesass 107 6 WARRANTY AND APPLICATION CAUTION eere 109 7 APPENDICES 2 oor aaa 110 TABLE OF CONTENTS Vil 7 1 ISDN BRI Ordering Guide for USA amp Canada Ordering ISDN isucsswadnusauwudaRuALI URN REENRNIMNKVEKNMEEN aM ERN DU KEEN ER VER Ir REN NR Details Details casacuvavat ui VE RENE RE MERE ERUR A Ka VV R HHUEE E ER EFE RN NKERUE ERER OUR VR FUE 7 2 Appendix 2 Known Working SPIDs by Telephone company TABLE OF CONTENTS Vii TELOS TWO USER S MANUAL 1 INTRODUCTION What is the Telos TWO 1 1 The Telos TWO Next Generation Quality The Telos TWO is the state of the art solution you need to connect telephone lines to professional audio systems It is the latest from Telos in our line of broadcast and teleconferencing telephone hybrids With it you can achieve the maximum quality audio possible from dial up telephone lines As you will see it offers many advantages over hybrids that work with analog lines The Telos TWO connects to a single ISDN Basic Rate Interface BRI telephone line which can provide two independent caller channels BRI lines are widely available in many parts of the world at a cost similar to two analog lines So there is often
139. us outputs tallies from the system and allows system control using simple logic inputs or switch closures The pin outs and interface specifications are given here Section 3 4 3 explains the functions available for these inputs and outputs Ooooooooo o e Oooooooo 9 PARALLEL CONTROL PIN FUNCTION Ground Output 3 CHAPTER 2 31 INSTALLATION TELOS TWO USER S MANUAL 3 Output 5 4 Output 4 5 N C 6 Input 4 7 Input 1 8 5 VDC 400 mA max 9 N C 10 Output 1 1 Output 2 12 N C 13 Input 3 14 Input 2 15 N C This power pin is in parallel with pin 3 of the SAA ports General purpose Input Output 15 pin D Sub connector with 5 status outputs and 4 control inputs See section 3 4 3 for information on how to set the function of each input and output Note that the 5 volts DC on pin 8 is in parallel with pin 3 on both SAA ports Failure to limit the combined current on these pins to 400mA could cause hardware damage or system instability CURIOSITY NOTE The DB designation for D Sub connectors is from Cinch Corp s part numbering system The proper Cinch designation for a 15 pin D Sub connector is a DA 15p plug or DA 15s socket not DB 15 Other Cinch designations for D Sub connectors are DE 9 DB 25 DC 37 and DD 50 Our thanks going out to Mike Schweizer for contributing this information Inputs e The function for each input can be independently using the St
140. use is returned when the equipment sending this cause has received a message that procedures indicate is not a permissible message to receive at this time Or This cause indicates that the switch sending this cause is clearing the call because a threshold has been exceeded for multiple protocol errors during an active call CHAPTER 4 105 TECHNICAL DATA amp TROUBLESHOOTING TELOS TWO USER S MANUAL Cause No 102 Timeout disconnect Recovery on timer expiration This cause indicates that a procedure has been initiated by the expiry of a timer in association with error handling procedures Cause No 111 Protocol Error unspecified This cause is used to report a protocol error event only when no other cause in this class applies Among other things this cause may be displayed if you failed to dial a 9 or 8 for an outside line if required Also may be returned if you have some types of restrictions as to the number of calls etc Cause No 127 SW56 disconnect Internetworking unspecified This cause indicates that an interworking call usually a call to SW56 service has ended May also be seen in the case of a non specific rejection by your long distance carrier try again at a different rate 4 5 The Terminal Command Interpreter Used for remote control via either the RS 232 serial connection or over the optional Ethernet interface using a telnet terminal See section 3 5 1 for using the command interfa
141. ut because that AGC 1s limiter like in its operation you will be able to change the average send level effectively Input Gain Related to input Levels Send Level Setting 7 0 4 8 Analog Input Level nom clip dBu 7 6 0 13 4 17 8 21 AES Input Level 27 dBfs 20 dBfs 16 dBfs 12 dBfs Send Level The Send Level adjustment allows you to attenuate the Hybrid Send level Normally this should be set to the maximum setting 0 dB HOT TIP We suggest that you view the Send AGC Limiter level after adjusting the Send Level To view AGC Limiter levels e Press the Stat button Usethe5 or6 buttons to scroll through the status screen until you see Hybrid 1 Status or Hybrid 2 Status as required The Left most meter on the LCD screen will show gain reduction on the send audio CHAPTER 3 52 OPERATION amp DETAILED REFERENCE TELOS TWO USER S MANUAL Send EQ Turning on this equalizer simulates a telephone handset microphone and will improve intelligibility Sometimes high quality studio microphones sound too good and the low frequency audio they pick up can sound unnatural on a telephone handset Section 3 6 has additional information on this function Audio Settings AES Out Sync 48kHz Output Gain 4dB DuplexLevel 10 Receive AGC EHHI 7 AES Out Sync This item selects the synchronization source for the AES EBU Output It can take one of two values e 48 kHz AES EBU Output rate is locked to a
142. uter to TWO 5 Ground 8 CTS TWO to Computer Using a 9 pin D sub connector this is an RS 232 serial port using the standard PC style format configured as if it were a modem HOT TIP This port is configured for DCE Data Communications Equipment as opposed to DTE Data Terminal Equipment operation meaning that it looks like a modem not a computer Therefore a reversing or null modem cable is required to connect to a modem while a standard straight through cable is required to interface to most computers Cables may be easily fabricated or may be obtained from a computer store 2 7 4 Ethemet Remote Control This is a standard Ethernet 10Base T connector for connection to an Ethernet Local Area Network Category 3 or better cable must be used The connector pin out is as follows PIN FUNCTION Transmit Transmit Receive Not Used CHAPTER 2 36 INSTALLATION TELOS TWO USER S MANUAL 5 Not Used 6 Receive 7 Not Used 8 Not Used This is the standard connector for 10Base T Note that TIA 568A or TIA 568B wiring can be used and we recommend it see section 2 4 2 for TIA 568B wiring details The IP address and other network parameters must be programmed before this port will be active This is covered in section 3 4 3 Section 3 5 1 has a list of commands which can be sent over the RS 232 or Ethernet port to control the system 2 8 System Setup amp Testing We presume you hav
143. uuuuuuuuuuuuuuuuuuuuuuuuuuas 83 Digital Dynamic Equaliser Receive EQ 2 cocer eror u oun uuuuuuuuuuuuuuuuuuu uuu uua 84 Duplex Ducking Systeri i5isissuaxnuus cusa E RES EEKRERHENENS CREE NEEE FR EVE RKSRNENEUEEERNEEREREHNAH RENTEN 85 Feedback Control 5 sossannpasuEMEHS RE RENEEERUNKNUNENE WENEHEENNNEE a a NENNEN HUM NEENR ECENER UM E ZEE 85 4 TECHNICAL DATA AND TROUBLESHOOTING 89 4 1 OVervie W E E 89 4 2 System FII WAare iiisussuvanuanuunuEHRRRSHaEE RUE rEENERHNENER NREREUERNENNREHENNUNMEN RENERSNEENENNEEE EN NA 89 Viewing Version Information cccssssssesseeseenseeseenseenseeseensensenseensenseensenseeseensenseensensens 89 REDIACING fii Wale io dex unui uua uk Rua ERERNE RE a NUES REDIERE RERER RR ENS KEEN RR AA 90 4 3 General Troubleshooting ecc eer eer enr n nnn enu nun uuuuauuuuur uuu uuruRuEs 91 The Debug Statiis Screens iii iuone cun aud REIS dEEN HIN REHNEHNENUNENEEEEREN HI NIE NCENNNNSENEN RERENNREN EHE 93 Using Loop Modes for Troubleshooting c eere rere erre erreur nun u nuu uuu 94 4 4 Troubleshooting ISDN Problems cce eee eere er enn n nnn nun un annu uunar 94 Galinitig ACCGSS odis eiinEEERKNEREFERVKERREENURNEENSREICNEENMRNENEENTERERHEEENKRERRERNERRE S EREERKENEVEEREE NENNEN NER 99 ISDN Cause Phrases Values eer er rer erneuern unn u nuu u unu unuunuuuuuuuuururuuu
144. will return it to the party that sent the Product and Telos Systems will pay for the cost of shipping Telos Systems authorized dealers are not authorized to assume for Telos Systems any additional obligations or liabilities in connection with the dealers sale of the Products Telos products are to be used with registered protective interface devices that satisfy regulatory requirements in their country of use TELOS TWO USER S MANUAL 7 Appendices 7 1 Appendix 1 Known Working SPIDs listed by Telephone Company Your SPIDs may be different Note for each line there is only one configuration which will work Your SPID is distinct from your telephone number and does not necessarily contain your area code or telephone number although this is generally the case A standardized SPID format for national ISDN of XXXY YYZZZZ0101 was phased in during 1996 and is used by most of the Telcos for new lines Incorrect SPIDs will be indicated by a line status of Wait on the ISDN status screen Often the Telco will leave the last 00 or 01 off the end of your SPID when giving it to you For the latest list check Telos Systems web page Additional SPIDs can be found at INTELs SPID Page http support intel com support isdn SPID_Tip htm XXX Area code YYY NXX prefix ZZZZ phone number Alltel Ohio XXXYYYZZZZ0101 Bell South Ameritech XXXYYYZZZZ0101 XXXYYYZZZZ011 1 or or XXXYYYZZZZ0100 XXXYYYZZZZ011 or or XXXYYYZZZZ01 01YYYZZZZ0
145. y to cause interference If it does the user will be required to eliminate the interference at the user s expense NOTE Objectionable interference to TV or radio reception can occur if other devices are connected to this device without the use of shielded interconnect cables FCC rules require the use of only shielded cables TABLE OF CONTENTS IV CANADA WARNING This digital apparatus does not exceed the Class A limits for radio noise emissions set out in the Radio Interference Regulations of the Canadian Department of Communications Le present appareil numerique n emet pas de bruits radioelectriques depassant les limites applicables aux appareils numeriques de les Class A prescrites dans le Reglement sur le brouillage radioelectrique edicte par le ministere des Communications du Canada TABLE OF CONTENTS Table of Contents CUSTOMEr SERVICE osaisin naaa RO RBREEERRRURRRE ERE Rua HRRURE ERR ER NR NURECHERERENRENENR NEN EEMEEEENEEE MEME ii 1 INTRODUCTION WHAT IS THE TELOS TWO 1 1 1 The Telos TWO Next Generation Quality 2 ooo anu n ua uuauuuuuuuuuuuu uuu uR uS 1 1 2 Why ISDN Makes Sense core onu aun nuuuauunuauauuuuuuuuuuuuuuuuuuuuuuuuRuuRSuRRRSRRSRRER 2 1 3 More About the Telos TWO s Capabilities ce eere erreur u unn un uuu unu uun an 4 2 INSTALLATION o eoru nune nun aaa aaa aaa aaa D 2 1 Gening Star

Telos TWO User's Manual, Version 1.0

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