Nortel DualMode 800, Maintenance Manual

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7-1
Wireless Solutions DualMode 800 Enclosure Maintenance Manual MTX08
Enhanced Receive Multicoupler (ERMC)
tests
7
ERMC description
The Enhanced Receive MultiCoupler (ERMC) modifies the receive RF signal
for the front-end of the TRU shelf transceivers. The ERMC provides
selectivity, signal gain and signal distribution so that the receive signal is
adequate for the transceiver front-end.
ERMC overall gain measurement test
This test is required for a cell site suspected of faulty operation. The test is
service affecting.
Step Action Observation
1 Notify the Control Center to OFFLINE the
cell site.
2 Disconnect the antenna feed cables from the
selectivity filter inputs.
3 Disconnect the cable from the ERMC splitter
port to be tested.
4 Using a 50-ohm cable, connect the
communications monitor Duplex Output port
to the selectivity filter input of the ERMC
(either A or B side). See Figure 7-1.
5 Using a 50-ohm cable, connect the
communications monitor T/R port to one of
the splitter ports corresponding to the A or B
path selected. See Figure 7-1.
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