Harris Intraplex STL-160 Series Installation & Operation Manual page 156

ACS-160 Series & STL-160 Series T1 Mux Installation & Operation
Version 2.11, August 2011
Table 6-7. Indicator Lights in Drop and Insert Loopback (or DI-A CM-5RB) Test
CM-5RB Module
* In a drop & insert multiplexer, the LOOP light actually indicates the THRU timing. The light blinks
to show that, although this timing setting is the primary one, the multiplexer is presently using
fallback (internal) timing.
6. Perform one or more channel tests on 4-wire voice channels or full-duplex data channels that
terminate through the DI-A CM-5RB module (if such channels are present), as in the previous
terminal multiplexer test procedure.
7. When channel tests are complete, take down the loopback on the DI-A CM-5RB module by
removing the patch cord between the T1 OUT EQUIP and T1 IN EQUIP jacks or by de-activating its
equipment loopback (EqLB).
8. Remove the patch cord or termination plug that was plugged into the T1 IN EQUIP jack of the DI-
B CM-5RB module.
9. Using a patch cord, loop back the DI-B CM-5RB module by connecting its T1 OUT EQUIP jack with
its T1 IN EQUIP jack (or activate the equipment loopback [EqLB] in the DI-B module). At this
point, both drop and insert CM-5RB modules should be timed by the signal coming from the
terminal multiplexer at Location 1, which has already been tested. Therefore, the fallback timing
"trick" is not needed to test the DI-B CM-5RB module.
10. Once the DI-B module is looped, verify that the indicator lights are responding (Table 6-8).
11. With the DI-B module looped, perform all desired local loopback tests on the transmit/receive
channel modules that are set up to terminate circuits coming in via the DI-B module. These tests
might include loss measurements on voice and program channels, bit error tests on data channels,
and so on.
12. Remove the loopback of the DI-B CM-5RB module by removing the patch cord or deactivating the
equipment loopback.
13. At this point you can perform end-to-end tests on channels established between any two locations
that have already been tested. The individual channel module manuals give recommended test
procedures.
6-12
Patch
Cord
Indicator Loopback
TX OUT ON
RX IN ON
ERR OFF
YEL OFF
BPV OFF
AIS OFF
FRM OFF
LOOP BLINKS*
INT ON
LPBK OFF
CPU OFF
NORMAL OFF
ALERT ON
ALARM OFF
6-Testing & Troubleshooting
EqLB
Loopback
ON
ON
OFF
OFF
OFF
OFF
OFF
BLINKS*
ON
ON
OFF
OFF
ON
OFF
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Intraplex Products