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USER MANUAL

EA915

X

Digital telephone hybrid

Manufacturer: Dealer:

Eela audio
Het Riet 8A
5431NM Cuijk
The Netherlands
Tel: (+31) 485 331182
Fax: (+31) 485 315505
E-mail: [email protected]
Internet: www.eela-audio.com

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Summary of Contents for EA915X

Page 1: ...USER MANUAL EA915X Digital telephone hybrid Manufacturer Dealer Eela audio Het Riet 8A 5431NM Cuijk The Netherlands Tel 31 485 331182 Fax 31 485 315505 E mail info eela info Internet www eela audio com ...

Page 2: ...orrect setting 6 Dilswitch 4 6 Voltageless lines 7 Use 2 or 4 Wire mode in EELA AUDIO consoles 7 Connections 7 Power 7 Receive 8 Send 8 Line 8 Phone 8 In Out Remote 8 Alignment hybrid 8 Send level 9 Receive level 9 Adjustment of the hybrid damping echo cancelling 9 Use 10 Answering and ending a call 10 Making a connection outgoing call 10 Technical specifications 11 Send 11 Receive 11 General 11 G...

Page 3: ...pass 14 Auto answer 14 TB 14 Faults list 14 Connection is lost at activating the hybrid 14 R bal en C bal alignment not satisfactory 14 Echo canceller does not respond 14 Echo canceller does not give sufficient damping 14 Echo canceller setting does not stop after 2 seconds 14 Hybrid can not be switched off locally or remote 14 Unsufficient receive signal 15 Insufficient send signal 15 Blockdiagra...

Page 4: ...equirements 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 w...

Page 5: ...r 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 an...

Page 6: ...er 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 thi...

Page 7: ...seriously DAMAGE the hybrid In the drawings below both settings are shown 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 longe...

Page 8: ...io 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 hybrid PIN NR SIGNAL REMARKS PIN 1 CH GND Chassis ground meant for the cable screen PIN 2 RECEIVE In phase signal of receive output PIN 3 RECEIVE In phase signal of receive output PIN 4 L In phase SEND signal left PIN 5 R In phase...

Page 9: ... highest level found the RCV control has to be set in such a way that this gives an output 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 cancelli...

Page 10: ... these desks will automatically activate the hybrid 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 T...

Page 11: ... Send Send input sensitivity 6dBm 18dBm Send gain adjustment range 12dB Limiter threshold 6 dBm Output noise 70 dBm Distortion 60dB Input impedance 20 kOhm electronically balanced Input balance 40 dB Receive Receive output level 24dBm 0dBm Receive gain adjustment range 12dB Output noise 60 dB Distortion 60 dB Output impedance 50 Ohms transformer balanced Output balance 40dB General Line Impedance ...

Page 12: ...ller switched off by means of the BYPASS switch the lower curve shows the crosstalk with the digital circuitry active 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...

Page 13: ...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 received by the installation in the studio from an outside caller Send Signal sent out...

Page 14: ...ignment 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 trimpots Subsequently tr...

Page 15: ... 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 ...

Page 16: ...EA915X DIGITAL TELEPHONE HYBRID INSTRUCTIONS FOR USE EELA AUDIO Het Riet 8A 5431NM CUIJK The Netherlands Page 16 Blockdiagram ...

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