ADPCM Voice Compression Options for Sprint 2 TDM
Contents
1. ADPCM VOICE Option User Manual Supplement WARNING BEFORE INSTALLATION PLEASE REFER TO SAFETY INSTRUCTIONS IN APPENDIX A 4 SALES 0118 965 5100 Sprint 2 With ADPCM Option Contents COMESINS 1424790 E E T R E AD eases aioe 5 el Mee E TCR EE 6 F nctionial e x acer cereo por evt oru e rtl cs 7 Mechanical een EE E 7 Voice C malarial SiG ln e DEE 8 VOICE aH EP 9 Telephone E Te estesa ty dede en co ln gba 9 VOICE PIGGY EE 10 Use amp Configuration PEE 11 Voice Channel Contfguraton 11 ADPCM Seip Display tedio trece Peto Eege 11 Voice Channel 12 Voice Quality El Ve un EE 13 ee ANON ee rS 14 Voice Module Installation gege er Decet ce rere is Ria re ces ena e ao tela 14 Voice Loop lee ote ete eb dete modu qe esci 14 Voice Interface Cabling amp 8 15 Voice Impedance 16 Voice Signalling 222 2 1 12 2112 1 16 Appendix 00000000A WarnlfigsU 17 TECHNICAL 0118 931 2233 5 Sprint 2 With ADPCM Option Introduction This User Manual Supplement describes Installation Operation and Use of the Sprint2 ADPCM Option card2. and must be read in conjunction with the Sprint2 Multiplexer User manual The Sprint2 ADPCM voice option allows the Sprint2 multiplexer to transmit voice traffic on the same composite link as data It compresses voice signals using the ADPCM Adaptive Differential Pulse Code Modulation algorithm allowing many voice channels to be carried through the digital data network The card hosts either 1 or 2 voice channels Typical use of the ADPCM voice channels is to interconnect two or more PABX systems If ADPCM is used over a 64K digital circuit up to 2 tie lines may be replaced using a single multiplexer A number of hardware configurations are achievable including Tie Line replacement PABX Extension Extension Piggy Back or a simple Hot line Some of these are illustrated later in this section Installation details for the ADPCM VOICE module are covered in Installation section commencing on page 14 6 49 SALES 0118 965 5100 Sprint 2 With ADPCM Option Functional Overview The Sprint2 ADPCM voice option provides excellent quality low bandwidth voice transmission over a digital data link using the ADPCM Adaptive Differential Pulse Code Modulation algorithm It compresses voice signal data to between 32Kbps and 8K bps depending on required voice quality de compressing and re constituting the analogue signal at the remote site The option is designed to interconnect PABXs using the inter PABX signalling protocols DCS also known a
3. the ADPCM VOICE option card ADPCM Setup Display The ADPCM VOICE configuration display shown below is reached by selecting the correct terminal type from the list displayed after plugging the terminal into the supervisor port SPRINT2 TIME DIVISION MULTIPLEXER VX Xx Mode RUN Data Monitor RXD Link Clock AUTO 64000 X 21 Carrier PRESENT Residual 4800 Option Cards DUAL VOICE Configure gt ACCEPT Display Page LOCAL COPY CHANNEL 1 2 3 4 5 VOX1 2 RATE 4800 4800 9600 9600 0 14400 TYPE SYNC SYNC SYNC SYNC 2 BIT RX CLOCK INT INT INT INT 4W TX CLOCK INT INT INT INT OdB OP BITS CHAR OdB IP PARITY 4W RTS CTS DELAY Oms Oms Oms Oms 0dB OP SIGNALS BOTH BOTH BOTH BOTH OdB IP CHANNEL MODE RUN RUN RUN RUN Use cursor keys to select parameter SPACE to toggle TECHNICAL 0118 931 2233 11 Sprint 2 With ADPCM Option Voice Channel Parameters Parameters for the voice channels are accessed by locating the cursor alongside the entry for a particular channel To view the valid choices for the parameter press the spacebar or keys The choices by parameter are PARAMETER CHOICES NOTES Channel VOXI VOX1 2 V LOOP Voice config selected Rate Voice channel bit rate 0 Channel OFF 8000 to 16000 400bps steps With 2 bit sampling selected 16000 to 32000 400bps steps With 4 bit sampling selected Wire 20r4 Analogue interface for voice connection O P Gain 6dB 3dB OdB 3dB 6dB Receive gain setting for voice 9
4. 4 Port X 21 Sprint 2 With Single ADPCM Option MXU9010 A1 MXU9014 A1 MXU9012 A1 MXF9505 V11 France Only MXF9505 V35 France Only MXU9011 A1 MXU9015 A1 MXU9013 A1 4 Port V 35 Sprint 2 With Single ADPCM Option 4 Port V 24 Sprint 2 With Single ADPCM Option 4 Port X 21 Sprint 2 With Single ADPCM Option 4 Port V 35 Sprint 2 With Single ADPCM Option 8 Port X 21 Sprint 2 With Single ADPCM Option 8 Port V 35 Sprint 2 With Single ADPCM Option 8 Port V 24 Sprint 2 With Single ADPCM Option Sept 96 Version 1 1 4 Port X 21 Sprint 2 With Single ADPCM Option MXU9010 A1 4 Port V 35 Sprint 2 With Single ADPCM Option MXU9014 A1 4 Port V 24 Sprint 2 With Single ADPCM Option MXU9012 A1 4 Port X 21 Sprint 2 With Single ADPCM Option MXF9505 V11 France Only 4 Port V 35 Sprint 2 With Single ADPCM Option MXF9505 V35 France Only 8 Port X 21 Sprint 2 With Single ADPCM Option MXU9011 A1 8 Port V 35 Sprint 2 With Single ADPCM Option MXU9015 A1 8 Port V 24 Sprint 2 With Single ADPCM Option MXU9013 A1 ADPCM Voice Compression Options for Sprint 2 TDM TECHNICAL SALES FAX ADDRESS WEB 0118 965 6000 0118 965 5100 0118 965 5001 464 Basingstoke Road Reading Berkshire RG2 0QN www blackbox co uk 0 8 H H BLACK BOX Sprint 2 With ADPCM Option How To Contact your Local Black Box Italy Black Box Italia S P A Tel 0227400280 Fax 0227400219 Web Sit
5. 550 23000 11500 2444 22000 11000 2338 21000 10500 2231 20000 10000 2125 19000 9500 2019 18000 9000 1913 17000 8500 1806 16000 8000 1700 Note Avoid bandwidths shaded if ACI5 signalling is to be used FAX transmission behaves similarly It has been shown to work successfully even below 12000bps 2 bit but it is advisable to allow as much bandwidth as possible to ensure reliable transmission as external influences such as the kind of FAX machine PABX and Network losses also affect transmission quality significantly TECHNICAL 0118 931 2233 13 Sprint 2 With ADPCM Option Installation The multiplexer must be disconnected from the power supply and all peripheral connections before opening Voice Module Installation With power turned OFF the screws on the left and right of the multiplexer are removed The blanking panel should be removed before the voice card is inserted This is achieved by removing three screws shown on the back panel These screws are used to retain the option card once fitted Power must be connected to the option module by its cable from the power socket on the motherboard Once this has been done only the BUS ribbon cable needs to be fitted Voice Loop Testing On a Dual ADPCM board the voice channels may be looped to each other for test purposes This allows local PABX connection tests to be performed at a single site location Channels 1 and 2 may be looped to each other speech a
6. d call out or receive calls from the PSTN connected to the remote location Telephone Extensions The voice card may be used to extend an extension line to a remote site as shown in the following diagram This allows the remote telephone to behave as if it is directly connected to the PABX Note that this may not be suitable for extending Key System extensions as there is no standard for Key System extension interfaces TECHNICAL 0118 931 2233 9 Sprint 2 With ADPCM Option Voice Piggy Back A piggy back arrangement using telephone extensions and trunk lines may be arranged as shown below This gives less flexibility than the Tie Line approach as direct extension dialling is not possible in the extension to trunk direction 10 49 SALES 0118 965 5100 Sprint 2 With ADPCM Option Use amp Configuration The voice channel options can be modified using the simple terminal configuration process described in the next section similar to that for the Sprint2 MULTIPLEXER Voice Channel Configuration This section only describes configuration of the Sprint2 ADPCM voice option card Configuration of the MULTIPLEXER TDM channels is described in the Configuration section of the Sprint2 MULTIPLEXER manual If you are not familiar with general configuration of the SPRINT2 MULTIPLEXER please refer to the Use amp Configuration section of the SPRINT2 MULTIPLEXER user manual before reading the following sections or attempting to configure
7. dB 12dB 15dB circuit I P Gain 6dB 3dB OdB 3dB 6dB Transmit gain setting for voice 9dB 12dB 15dB circuit Sampling 2 bit 2 bit sample 8K to 16K Or 4 bit 4 bit sample 16K to 32K The LOCAL and REMOTE setup pages are accessed as usual to configure either location Channels may be copied in the same way as TDM channels 12 49 SALES 0118 965 5100 Sprint 2 With ADPCM Option Voice Quality Bandwidth The sampling rate used for each voice channel is totally at the discretion of the user depending on the voice quality required The highest quality achievable is at 32000bps 4 bit sampling With this selection voice quality is extremely good near Toll Quality At 16000bps 2 bit sampling quality is again very good the most obvious difference being slightly increased background noise In each of the above cases the bandwidth available to speech and signalling is 3 4Khz Bandwidth falls off linearly with bit rate towards a minimum of 1 7Khz at either 16000bps 4 bit or 8000bps 2 bit sampling This must be born in mind if ACIS signalling MODEM Tones of FAX tones are to be suitably preserved The following table shows bandwidth calculated at various bit rates ADPCM BANDWIDTH 4 bit 2 bit Bandwidth bps bps KHz 32000 16000 3400 31000 15500 3294 30000 15000 3188 29000 14500 3081 28000 14000 2975 27000 13500 2869 26000 13000 2763 25000 12500 2656 24000 12000 2
8. e www blackbox it Deutschland Black Box Deutschland Tel 0811 5541 0 Fax 0811 5541 499 Web Site www blackbox deutschland com Switzerland Datacom Black Box Services AG Tel 0554517070 Fax 0554517075 Web Site www black box ch Netherlands Black Box Datacom BV Tel 03032417799 Fax 0302414746 Web Site www blackbox nl Belgium Black Box Tel 027258550 Fax 027259212 Web Site www blackbox be France Black Box Catalogue Tel 0145606700 Fax 0145606747 Web Site www blackbox fr 2 SALES 0118 965 5100 Australia Black Box Catalog Australia PTY LTD Tel 0398797100 Fax 0398702955 Brazil Black Box Do Brasil Tel 011 5515 4000 Fax 011 5515 4002 Web Site www blackbox com br Canada Black Box Canada Corp Tel 0416 736 8000 Fax 0416 736 7348 Web Site www blackbox com Mexico Black Box De Mexico S A de C V Tel 05 420 0100 Fax 05 420 0123 Web Site www blackbox com mx Japan Black Box Catalog Tel 03 3820 5011 Fax 03 3820 5010 Web Site www blackbox co jp U S A Black Box Corporation Tel 724 746 5500 Fax 724 746 0746 Web Site www blackbox com Sprint 2 With ADPCM Option Spain Chile Black Box Comunicaciones S A Black Box Chile Tel 00 562 223 8811 Fax 00 562 225 1002 Web Site www Blackbox cl Tel 34 91 663 0200 Fax 34 91 661 84 35 Web Site www blackbox es TECHNICAL 0118 931 2233 3 Sprint 2 With ADPCM Option SPRINT 2
9. nsure safe operation such that the user and TELECOM Network are adequately protected It must not under any circumstances be operated without an earth connection which could nullify its approval for connection to a network WARNING INSTALLATION OF EQUIPMENT Installation of this equipment must only be performed by suitably trained service personnel WARNING CONNECTION OF OTHER EQUIPMENT This equipment allows connection only of suitably approved equipment to its ports the safety status of which are defined below TNV Ports i Voice 1 ii Voice 2 The above named ports are classified as TNV Telecom Network Voltage in accordance with Clause 4 2 of EN41003 and must only be connected to equipment which similarly complies with the TNV safety classification TECHNICAL 0118 931 2233 17
10. rivate PABX equipment It is an approval requirement that the RJ45 connector tabs must be clipped short to prevent user access The above cables may be ordered separately where required from Black Box TECHNICAL 0118 931 2233 15 Sprint 2 With ADPCM Option Voice Impedance Matching The port impedances are standard for both 2 wire and 4 wire interfaces as follows The private system s impedance must be correctly matched to the above to achieve optimal echo cancellation Voice Signalling Configuration The voice channels are configured for BT standard keying E amp M and 15 unless specified by the customer Please contact Black Box if you require an alternative configuration If DC5 E amp M signalling will not function the most common cause is that there is no GROUND RETURN connection between the Multiplexer and the PABX system At least one of these SIGNAL GROUND connections must be made to the PABX ground for each voice card used The DCS E amp M and SIGNAL GROUND connections are not required for AC15 signalling ACIS signalling requires sufficient bandwidth to allow the 2280Hz signalling tones to be passed without degradation This should be considered with reference to the table in the Voice Quality Bandwidth section 16 lt SALES 0118 965 5100 Sprint 2 With ADPCM Option Appendix 00000000A Warnings0 WARNING THIS EQUIPMENT MUST BE EARTHED This equipment relies on the EARTH connection to e
11. s E amp M and 5 The compression bit rate and other voice parameters are selected using the same configuration methods used for the SPRINT2 MULTIPLEXER Mechanical Construction The ADPCM voice module is built onto a single printed circuit board assembly which must be installed in the option slot of the Sprint2 MULTIPLEXER One or Two voice channels are fitted on each option card The following diagram shows the layout of the voice card ADPCM MODULE PCB Layout TECHNICAL 0118 931 2233 7 Sprint 2 With ADPCM Option Voice Channel Signalling The ADPCM module supports pulse E amp M DC5 dialling between telephone or PABX systems It will also carry tone Basic 15 signalling providing that the bandwidth allocated to the channel is sufficient This is discussed further in the Voice Signalling Configuration section ACI5 signalling uses a tone of 2280 Hertz pulsed at the same rate as DC5 E amp M that is 10 ACIS is often preferred since many PABXs incorporate AC15 signalling as standard and no cost is incurred purchasing signalling convertors Providing that sufficient bandwidth 8 49 SALES 0118 965 5100 Sprint 2 With ADPCM Option is allocated the ADPCM card option supports basic AC15 signalling without the need for such converters Voice Tie Line The diagram below illustrates a voice Tie Line connection Extension telephones may direct dial extensions at the remote location an
12. t the telephone attached to Channel 1 will be heard at the earpiece of the telephone at Channel 2 and vice versa This is achieved by setting the voice channel to V LOOP mode Note When doing voice LOOP tests there MUST be a clock source This may either come from the digital network or the unit may be set to INTERNAL CLOCK See user manual 14 49 SALES 0118 965 5100 Sprint 2 With ADPCM Option Voice Interface Cabling amp Connections Suitable connection may be arranged using a Krone wallboxes type 251 or similar The private voice equipment is connected to the Krone strips in the wallbox using a Krone IDC tool Each pair of voice channels is wired using two RJ45 cables to a 237A type Krone connection block as follows RJ45 Krone Colour Name Type pin pair Ch1 Ch2 Ch3 Ch4 Ch5 Ch6 etc 4 la 6a Blue RXa TXa O P when 4 wire I O when 2 wire 5 1b 6b White Blue RXb TXb O P when 4 wire I O when 2 wire 3 2a 7a White Green TXa 4 wire only 2b 7b Green TXb I P 4 wire only 7 3a 8a White Brown E O P Closing Contact to ground 8 3b 8b Brown E Lead Reference Signal ground for UK link positions 1 4b 9b White Orange M Lead Reference Internal 12V bias Do not connect Where the following types apply Output from multiplexer Input multiplexer Both input output Connection may be made directly to the RJ45 connector where the connection is to P
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