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Page 3-18
3.1.1 Tracer Lamps (TL)
The TL lights up when a plug is inserted into one of the monitor jacks on the front of a DSX card.
Also, with the monitor plug in place, TLs of cross-connected cards will flash for 30 seconds, then
light steadily.
Figure 14 - Tracer Lamp Operation
3.1.2 Monitor Ports
All DSX cards have at least one monitor port on the front side, labeled “M” or “MON”. Test
equipment may be applied without interrupting service. The three-port card has a monitor for the
OUT signal only.
3.2 DSX Cross-Connections
Do not make rear cross-connections using cables longer than 27 ft, unless using a repeater card.
Do not make front patch connections longer than 20 feet.
3.2.1 Backplane Cross-Connections
To cross-connect two network elements, use approved coax cable and connect the OX (X-OUT)
port from the card for network element 1 (NE-1) to the IX (X-IN) for network element 2 (NE-2),
AND connect the OX port for NE-2 to the IX port from NE-1. See the diagrams below.
MON
OX
O
IX
I
MON
Power from
Backplane
Batt A
Rtn A
TL
Backplane Tracer Lamp
Tracer Wire Jack
