Functional Description - ADC DSX-3 User Manual

3 FUNCTIONAL DESCRIPTION

The DSX-3 (DSX-4H-24) Rear Cross-Connect System consists of up to 240 individual DSX-4H
circuit modules, two of which are shown schematically in
accommodates the input and output of one digital equipment unit, and two circuit modules are
required for each cross-connect.
EQPT
A
Each circuit module has connectors and jacks for terminating office/equipment cables and for
cross-connecting and patching the various office/equipment units together. Cabling from
office equipment is connected to DSX-4H equipment IN/OUT connectors, and any equipment
input or output may then be connected to any other equipment input/output by means of
jumpers connected to the cross-connect connectors. Equipment inputs and outputs may also be
tested or temporarily patched to other equipment inputs and outputs by means of patch cords
plugged into the DSX-4H patch jacks.
A typical DSX-4H circuit arrangement is shown in
are connected to the IN/OUT connectors of three different DSX-4H circuit modules. Office
equipments A and B are then connected together at the DSX-4H circuit modules by temporary
patch cords. The corresponding tracer lamp (TL) terminals are also jumpered together by the
messenger cord in the cross-connect cable. Cross-connected equipments A and B can now be
identified, monitored, and tested as follows:
• Circuit Identification - Pulling any lamp switch (LS) outward causes the tracer lamp at
each end of the corresponding cross-connect cable to flash for approximately 30 seconds
and then remain lit until the lamp switch (LS) is pushed back in. This gives a visual
indication of the equipment units that are cross-connected together.
• Bridged Monitoring and Testing - Monitor or test equipment patched into the MON jack
of either circuit module allows testing without interrupting the signals between the A and
B equipment.
LAMP
SWITCH
GND
TL
–48V
OUT
IN
Figure 1-1. Two DSX-4H Circuits
ADCP-80-314 • Issue 6 • January 2001 • Section 1: Description and Application
Figure
X-O/ X-O/
X-I
X-I
MESSENGER
CORD
MON MON
OUT OUT
IN
IN
X-OUT
X-OUT
X-IN X-IN
Figure 1-2. Office equipments A, B, and C
1-1. Each circuit module
LAMP
SWITCH
GND
TL
–48V
OUT
EQPT
B
IN
=EQUIPMENT IN OUT CONNECTOR
= CROSS-CONNECT CONNECTOR
= PATCH JACK
= PIN JACK
1266-D
 2001, ADC Telecommunications, Inc.
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