Eela Audio EA915X User Manual

USER MANUAL

EA915X Digital telephone hybrid

Manufacturer: Dealer:

Eela audio
Het Riet 8A
5431NM Cuijk
The Netherlands
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.eela-audio.com

EA915X DIGITAL TELEPHONE HYBRID

INSTRUCTIONS FOR USE

EELA AUDIO Het Riet 8A
5431NM CUIJK The Netherlands Page 2

Contents.

Preface. 4

Warning 4
CE-Product 4
Maintanance 4
Waste Disposal! 4

Purpose. 5

Realisation. 5
Installation. 5
Dilswitch Settings. 5
Dilswitch 1. 5
Dilswitch 2 & 3. 6
Making the correct 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

Glossary. 12

DSP. 12
Hybrid. 12
Telefication. 12
Codec. 13
Echo-canceller. 13
Ring. 13
Cancel. 13

EA915X DIGITAL TELEPHONE HYBRID

INSTRUCTIONS FOR USE

EELA AUDIO Het Riet 8A
5431NM CUIJK The Netherlands Page 3

Flash. 13
Update. 13
Dilswitch. 13
Hybrid crosstalk. 13
Receive. 13
Send. 13
Limiter. 13
A/D. 13
Bypass. 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

Blockdiagram. 16

EA915X DIGITAL TELEPHONE HYBRID

INSTRUCTIONS FOR USE

EELA AUDIO Het Riet 8A
5431NM CUIJK The Netherlands Page 4

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 to 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.

EA915X DIGITAL TELEPHONE HYBRID

INSTRUCTIONS FOR USE

EELA AUDIO Het Riet 8A
5431NM CUIJK The Netherlands Page 5

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 possible quality and reliability. To obtain this purpose, the
EA915X uses a Digital Signal Processor which reduces the crosstalk, normally existing in a hybrid
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.

DIL SWITCH SETTINGS

CALL CALL CALL+READY

1 ON OFF

REMOTE ON/OFF CONTINUE PULSE

4 ON OFF

CANCELATION CONTINUE MANUAL STORE

2 ON OFF ON
3 OFF OFF/ON ON

Remark: Standard factory settings 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.