User's Manual

EX7100 Technical Manual - Module Descriptions
©1999 Exicom Technologies (1996) Ltd 7-64 Issue 3 - May 2001
7.13 Line Interfaces Type 2971 and Type 2967
7.13.1 General
Inclusion of a six-channel Line Interface in each EX7100 terminal allows six analogue
exchange or subscriber telephone lines (depending on which module is fitted) to be
operated over the EX7100 link. Voice, fax and data traffic can be accommodated.
Each Line Interface module carries all the necessary line interface, speech compression
and control components.
A 50-way Champ connector is provided on the rear panel for line connections as shown
in Figure 7.33 below.
6 Ch Line I/f Module
(Exch or Subs)
Rear Panel
Champ
Connector
PCB
Analogue
Lines
1
2
3
4
5
6
Modem
Controller
Module
64kb/s
Control
PL902
PL902
PL1
6
Analogue
Lines
Figure 7.33: Six Channel Line Interface Connection Block Diagram
Isolated Power Supply Module Type 2990
Isolated Power Supply Module Type 2990 is attached as a daughter-board; it provides the
necessary power supply rails for each Line Interface.
This sub-module should be considered part of the Line Interface module. Refer to Section
7.14 for details of this module.
Four wire + E & M Interface Type 8022
The Exchange Terminal may be fitted with an optional Four Wire + E & M Interface. This
PCB is positioned above the Two-wire Exchange Interface Card.
Jumpers JP103, JP203, JP303, JP403, JP503 and JP603 allow for selection of positive
or negative M-wire for each of the six channels.
When used in point-to-point configuration (refer to Section 1.2.2), it may be necessary to
increase the audio line levels above the maximum of +3 dBm. In order to achieve this,
jumpers JP101, JP102, JP201, JP202 etc may be set to increase the line level range by 4
dBm i.e. the lower limit changes from -15 dBm to -11 dBm and the upper limit changes
from +3 dBm to +7 dBm.
It should be noted that the line level menu does not change to indicate the increased
range. Care should be taken to add the 4 dB to the value indicated in the menu.