USER MANUAL EA915X Digitale telefoon hybride
Contents
1. e Allcontrols in center position e 22Hz 22kHz Bandwidth e 600 Ohms source and terminating impedance for line adjustments e Voltageless line input circuitry e Line tel input 12dBm send input 6dBm both 1kHz Send Send input sensitivity 6dBm 18dBm Send gain adjustment range 12dB Limiter threshold 6 dBm Output noise lt 70 dBm Distortion lt 60dB Input impedance 20 kOhm electronically balanced Input balance lt 40 dB Receive Receive output level 24dBm 0dBm Receive gain adjustment range 12dB Output noise lt 60 dB Distortion lt 60 dB Output impedance lt 50 Ohms transformer balanced Output balance lt 40dB General Line Impedance 600 Ohms Maximum level to telephone line 3dBm Distortion lt 50dB Hybrid damping gt 40dB average Dimensions 19 Inch 1U high 155 mm WxHxD Input 18 Volts AC via included mains adapter Power consumption 4 Watts EA915X HYBRID XTALK BYBL dBws FREO Hz RE IN so NAITA al TT Vn A TT PT TTT AAT A RI BIN E III E BE 8 HR N Fig 1 EELA AUDIO Parmentierweg 3 5657EH Eindhoven Netherlands 10 23 JUN 98 08 34 35 In fig the hybrid crosstalk is shown from a random connection Note that every new test will give another result The upper curve shows the crosstalk with the digital echo canceller switc2. 19 4 01 01 1 5657EH Eindhoven Netherlands 13
3. Making the correct setting The most user friendly dilswitch setting is the last one mentioned DILSW2 On amp DILSW3 On because the digital echo canceller adjustment doesn t have to be realigned after the unit is switched on This has the advantage that the hybrid can be used to go on air direct without the need for a producer or operator to have a pre conversation in which this adjustment for minimum hybrid crosstalk has to be performed This method can only be used if the condition of the lines from the hybrid in the studio to the first in house telephone exchange are the same This means this can be used with any stationary hybrid in a studio or studio complex in which above mentioned conditions are the same because the lines used are the same If for some reason this method does not give satisfactory results the dilswitch settings according the first method then can be used DILSW2 Off amp DILSW3 Off The hybrid will after it has been switched on during a short time approx 20 seconds adjust itself In some cases this adjustment can be found not good enough The auto adjustment then can be activated again by pressing the UPDATE switch for 20 seconds The hybrid crosstalk cancellation will then be adjusted until a minimum is reached DILSWITCH 4 With this dilswitch the behaviour of the EXTERNAL ON input can be set In the ON position the hybrid can be switched ON remotely by means of a continuous closing loop conta
4. USER MANUAL EA915X Digitale telefoon hybride Manufacturer Dealer Eela audio Parmentierweg 3 5657 EH Eindhoven The Netherlands Tel 31 40 2510484 Fax 31 40 2570482 E mail info eela nl Internet www eela nl Manual version 1 1 8 June 2001 EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE Contents EL 3 PUrDO SC 4 ei UE er EE 4 installato eiserne A 6 Alignment hybrid an 7 UE ie 8 Technical Specifications 10 Glossary elle 11 12 Blockdiagram een 13 EELA AUDIO Parmentierweg 3 Rev 19 4 01_01 1 5657EH Eindhoven Netherlands 2 EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE Preface WARNING Do not expose the Digital hybrid to rain or high humid environments to avoid danger of fire or electric shock To reduce the risk of electrical shock do not remove covers or back when unit is powered up No user servicable parts inside Refer for servicing to qualified service personnel only Modification or servicing by unqualified personnel will void the warranty Avoid exposure of the Digital hybrid to bright sunlight high temperatures and dust CE PRODUCT The Digital hybrid complies with the requirements of the New Approach Directives as they are pointed out by the EEC The CE mark can be found on the back of the unit The EA915X has not been approved t
5. after 3 call pulses Make sure the fader is closed in order not to have the caller on air directly With this fader closed it is possible to have a pre conversation using the TalkBack button on the channel and the PFL or COM possibility If the hybrid crosstalk is found poor the caller can be asked to be silent when performing the UPDATE procedure Thus the digital echo canceller is re adjusted Now the telephone call can be brought on air by opening the fader It is not possible to switch off the hybrid when the fader is open as a security not to loose a call when it is on air first the fader has to be closed When the fader is open it is not possible to use the TalkBack route to talk to the caller unless in 4 wire mode the caller can hear the program audio through the dedicated telephone return path Making a connection outgoing call A connection to the caller can be established by means of an external telephoneset connected to the terminal marked phone Only when the hybrid is not activated this telephoneset is looped through to the telephone line After the number has been dialled the hybrid can be activated and the procedure can be followed as described above starting at Make sure the fader is closed EELA AUDIO Parmentierweg 3 Rev 19 4 01_01 1 5657EH Eindhoven Netherlands 9 EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE Technical specifications Technical specifications are valid under the following conditions
6. ct In the OFF position the hybrid can be toggled On and OFF by a remote pulse contact This EXTERNAL ON input can be found on the 25 pin D type connector marked EXT_ON EELA AUDIO Parmentierweg 3 19 4 01 01 1 5657EH Eindhoven Netherlands 5 EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE Voltageless lines In some occasions some in house telephone exchanges the telephone line does not carry any voltage for the extensions Within the hybrid you can find 4 jumpers with which its telephone circuit can be adapted to this different application regarding these telephone lines The factory setting for these jumpers is in the position for the hybrid to be used on normal telephone lines carrying linevoltage NEVER use the setting for the voltageless lines on a normal telephone line which does carry a voltage because this could seriously DAMAGE the hybrid In the drawings below both settings are shown Line set as normal telephone line Line set as voltageless input Use 2 or 4 Wire mode in EELA AUDIO consoles Because of the excellent low hybrid crosstalk the telephone module in the EELA AUDIO mixing consoles can be set in the 4W mode dilswitch position or central processor setting This means talking into the return output of the mixing console to the hybrid and to the caller is no longer blocked when the fader is open and the hybrid is on air Connections Adjustment of the DIL switches can be done on the rear side
7. d PIN NR SIGNAL REMARKS PIN 1 CH GND Chassis ground meant for the cable screen PIN RECEIVE In phase signal of receive output PIN RECEIVE In phase signal of receive output In phase SEND signal left In phase SEND signal right Cl EXT_ON With a connection to GND the unit can be switched on DAPT_EXT With a connection to GND the unit can be updated see UPDATE button Ring optocoupler output colector for external signalling wel N Out of phase signal of receive output az a IN d 4 5 7 AE Ground for EXT_ON input Ground for ADAPT_EXT output RING Ring optocoupler output emitter for external signalling Alignment hybrid When all settings and connections are made the level and balance of the hybrid have to be adjusted to be able to get the most optimal result Use a screwdriver with a not to small blade in order not to damage the slot of the trimpots Out of phase signal of receive output Out of phase SEND signal right 1 1 1 1 1 1 1 2 Out of phase SEND signal left RECEIVE RECEIVE L R A 2 RING RECEIVE RECEIVE L GND GND RING 0 6 8 9 2 we IN2 EELA AUDIO Parmentierweg 3 Rev 19 4 01_01 1 5657EH Eindhoven Netherlands 7 EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE Send level The hybrid is set out in such a way that when putting the SND control in the centre position the nominal inp
8. eived by the installation in the studio from an outside caller Send Signal sent out by the studio to the outside caller Limiter A limiter is a circuitry limiting the volume of an audio signal thus making sure it does not exceeds a preset maximum EELA AUDIO Parmentierweg 3 19 4 01 01 1 5657EH Eindhoven Netherlands 11 EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE A D Is the abbreviation used to convert an Analog signal to the Digital domain Bypass Is to activate the situation where the digital echo canceller is not used bypassed Auto answer Process of automatically answering an incoming call over the telephone TB Is the abbreviation used for Talk Back Faults list Always make sure that the unit receives supply voltage Connection is lost at activating the hybrid If the connection is lost when switching the hybrid on and the CALL led did indicate an incoming call in a normal way could indicate that the telephone line is connected to the PHONE terminal instead of the LINE terminal R bal en C bal alignment not satisfactory Jumpers are possibly set for use of the wrong line type or different line conditions such as extreme short or long lines Echo canceller does not respond If the echo canceller does not give extra damping it is possible the hybrid still is in bypass mode Echo canceller does not give sufficient damping Try making another setting of the R bal and C bal trimp
9. ettings are marked in grey DILSWITCH 1 With this dilswitch the behaviour of the RING output Opto isolator is set In the ON position this RING output can be used as indication of an incoming call In the OFF position the output can be used for signalling of an incoming call as well as indication of the ON OFF status of the hybrid This RING output can be found on the 9 pin D type connector marked IN OUT REMOTE EELA AUDIO Parmentierweg 3 Rev 19 4 01_01 1 5657EH Eindhoven Netherlands 4 EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE DILSWITCH 2 amp 3 With these dilswitches the behaviour of the automatic control for the minimum hybrid crosstalk is set Dependant of the application the best automatic control method can be selected DILSW2 DILSW3 CROSSTALK SETTINGS CANCELLATION After switching the hybrid on the automatic adjustment is active for approx 2 seconds After that the adjustment can be repeated by pressing the UPDATE switch N OFF ON OFF After switching the hybrid on the automatic adjustment is continously active By pressing the UPDATE switch this adjustment process can be toggled OFF orON After switching the hybrid on the adjustment parameters used are those which are obtained from a previous adjustment procedure and stored in the memory By pressing the UPDATE switch the unit tries to find a new optimum setting at releasing the UPDATE switch these new parameters are stored in the memory
10. hed off by means of the BYPASS switch the lower curve shows the crosstalk with the digital circuitry active For reading of an absolute value on the dB axis 9dB has to be subtracted because of the respectively 9dB attenuation in the send path and 18dB gain in the receive path Rev 19 4 01_01 1 EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE Glossary DSP Stands for Digital Signal Processor This is a processor specially meant to perform digital calculations on analogue signals Hybrid Term used for the circuit to adapt a 2 wire telephone system to a so called 4 wire separate input and output interface Telefication Organisation in the Netherlands registered as Notified Body to give approvals to telecommunication equip ment Codec Stands for short for a Coder Decoder combination Also often used as name for an A D and D A converter combined in 1 housing Echo canceller System eliminating crosstalk in a hybrid circuit Ring Not audible call signal of the EA915X unit Cancel Term for eliminate or escape Flash Is a type of memory This type of memory is re writable and does not need a supply voltage to retain its data Update Is used to let the echo canceller adapt itself to a new situation Dilswitch Miniature switch bank with which user specific settings can be made Hybrid crosstalk Crosstalk inherent to the hybrid circuitry and system in general Receive Signal rec
11. o be connected to the direct telephone line and must therefore due to the requirements of the telephone provider be connected only through an in house telephone exchange pseudo terminal equipment Direct connection to the public telephone net is under sole responsibility of the user This product can only be used for the purpose the installation and the environment as described in this manual The manufacturer does not take any responsibility for applications and handling which are not conform to these descriptions MAINTANANCE Clean the outside of the unit when necessary with a soft perhaps only light damped cloth Do not use any detergents like alcohol ammonia or white spirit to clean the unit This could damage the surface WASTE DISPOSAL The equipment and its packing material should ultimately be disposed off in accordance with the applicable environmental regulations or the unit can be returned to the dealer or manufacturer Do not dispose the Digital hybrid with the normal household waste For ease of reading all commonly known technical terms are used in the text as they are a glossary is added in the back of this manual EELA AUDIO Parmentierweg 3 Rev 19 4 01_01 1 5657EH Eindhoven Netherlands 3 EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE Purpose The main purpose of the EA915X is to be used as an interface to make a connection between a telephone line and a mixing console with the highest p
12. of the unit The following other connections can be found on the back side of the unit Power To this inlet the seperate mainsplug power supply 2x18V AC has to be connected Use only the power supply included in the delivery check for the correct mains voltage EELA AUDIO Parmentierweg 3 Rev 19 4 01_01 1 5657EH Eindhoven Netherlands 6 EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE Receive This is the signal coming from the caller so being the output of the hybrid This signal should be fed into the input of an audio mixing console Send This is the signal to be sent to the caller and is the input signal for the hybrid This signal comes from a clean feed output of the audio mixing console Line Connection for the telephone line Phone Connection for a normal telephone set to which the line is looped when the hybrid is off This allows the user to dial a connection have a pre conversation with a caller or answer an incoming call In Out Remote On this connector the control inputs and outputs can be found for remote control Apart from on the XLR s the receive and send signals also can be found here thus enabling the hybrid to be connected to an EELA AUDIO mixing desk using one multicore cable The EA915x can be used with Eela Audio mixing consoles With the Logos mixing console a 1 to 1 1 1 cable can be used The ADAPT signal has the same functionality as the UPDATE button on the front side of the hybri
13. ossible quality and reliability To obtain this purpose the EA915X uses a Digital Signal Processor which reduces the crosstalk normally existing in ahybrid circuitry to a minimum Realisation To realise this purpose a design has been set up with a by TELEFICATION successfully tested and approved hybrid circuitry from the EA815 1 analogue hybrid and attached to it a 16 bit Digital Signal Processor of Analog Devices and a 16 bit Codec of Crystal together forming the heart of the digital echo canceller FLASH technology is used for permanent storage of the settings for the echo canceller A microprocessor takes care of the internal and external control Installation Check the equipment for any transport damage after unpacking Before installation and taking the unit into service please read this manual Make sure the unit will be installed in any equipment bay with sufficient unobstructed air circulation so that the maximum air temperature in the equipment environment will not be exceeded Before mounting the EA915X into a 19 rack the user should make some settings which are dependent on the use of the unit and its infrastructure These settings can be done over 4 DIL switches which are reachable on the rear of the unit Make sure the power is not connected yet when adjusting the switches DILSWITCH SETTINGS CALL READY OFF nom ON OFF PULSE OFF CAN or CONTINUE MANUAL 2 ON OFF 3 OFF OFF ON Remark Standard factory s
14. ots Subsequently try again to minimize the crosstalk using the UPDATE switch Hold it for approx 20 seconds Echo canceller setting does not stop after 2 seconds Continuous automatic adjustment is selected by means of dilswich setting Hybrid can not be switched off locally or remote Hybrid is switched ON externally and thus can not be switched OFF locally by means of its frontpanel switch or hybrid is switched ON locally by means of the frontpanel switch and thus can not be switched off remotely Unsufficient receive signal If this only occurs occasionally the cause can be found in the caller or the line If this is a continuos phenomena the RCV control might not been aligned correct If the signal does not contain any low frequencies chances are that the balanced signal is not interfaced properly to a subsequent unbalanced input circuitry Insufficient send signal First of all make sure that the input signal of the hybrid is within the specifications mentioned so the mixing console gives sufficient output signal If adjustment of the SND control still does not allow for enough signal present this could mean that the drive from the output in front of the hybrid input is unbalanced EELA AUDIO Parmentierweg 3 Rev 19 4 01_01 1 5657EH Eindhoven Netherlands 12 EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE Blockdiagram LINE TERMINATION Q 104 HBN UPDATE BYPASS EELA AUDIO Parmentierweg 3
15. present This can be achieved by covering the receiver at the caller s end and asking the caller to be silent for some seconds If the result is not satisfactory the procedure for adjusting the R bal and C bal can be repeated using another setting The hybrid is now completely aligned and ready for use Use The EELA AUDIO hybrid of course can be easily interfaced with all EELA AUDIO telephone modules from the 130 S340 and 440 series consoles An incoming call is also indicated on the channel and the hybrid can be activated diverted from the channel EELA AUDIO Parmentierweg 3 Rev 19 4 01_01 1 5657EH Eindhoven Netherlands 8 EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE In the S130 series no Auto Answer and Ready indication is possible In the S340 and S440 consoles the software of this telephone channels also offers the possibility of Auto Answer Answering and ending a call An incoming call is indicated by means of a flashing LED on the front when interfaced to a desk this flashing can be made visible there as well by means of the external signalling output on the hybrid s REMOTE connector This call can be answered by either pressing the HYBRID ON switch on the front of the hybrid or remote e g the mixer s channel ON OFF button again via interfacing EXT_ON on the REMOTE connector of the hybrid When interfaced to an EELA AUDIO desk the auto answer function of these desks will automatically activate the hybrid
16. t level of the hybrid to the mixing console input of about 6 dBm Again do not give too much gain in this path to prevent overload of the electronics It is easier for a too low signal to be corrected with the gain or the gain of the input channel of the mixing desk Adjustment of the hybrid damping echo cancelling The alignment of the hybrid circuitry is done by means of the R bal and C bal controls and ensures an minimal crosstalk in these analogue circuits before the digital echo canceller takes care of any residual unwanted signal The best way to perform this alignment is by using a pink noise signal because it contains all frequencies with equal energy thus enabling a wideband adjustment If no such signal is available a wideband music passage can be chosen Now switch the hybrid in bypass mode by pressing the BYP switch which is situated behind the frontpanel and can only be operated by inserting e g a small screwdriver through the hole in the frontpanel marked BYPASS Judge the contribution of the send signal to the caller appearing because of the crosstalk in the receive signal Subsequently use the R bal and C bal trimpots to adjust this contribution to a minimum Now switch off the bypass mode By pressing the UPDATE switch the digital echo canceller will minimize the residual crosstalk For getting the best result it is important that during the update procedure of the digital echo canceller there is no receive signal
17. ut level of the SEND input is set to 6dBm The adjustment range of the SND control is en 12 dB with reference to this nominal level The send level has to be aligned as follows Apply to the hybrid input by means of the controls of the mixing console a nominal signal Now activate the hybrid by pressing the HYBRID_ON switch Adjust by means of the SND control the level in such a way that only the peaks occurring in the signal make the LIM led go on Convince yourself of the fact that a continuos overloading limiter gives a poor result for the signal to the caller whereas a limiter handling an occasional peak sounds good Now the send level has been set correct and the hybrid can be switched off Receive level Make sure there is NO send level present at alignment of the receive level The hybrid is set out in such a way that when the RCV control is placed in the centre position the output level is set to 6dBm with a signal present on the telephone line of 12 dBm The control range of the RCV control is and 12 dB It is important to align the receive level very accurate to make sure there is no overload on the input of the A D converter This results in a considerable and aggressive distortion of the receive signal Because the level of the various telephone connections can vary it is wise to test the maximum level by making several calls With the highest level found the RCV control has to be set in such a way that this gives an outpu
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