Nortel DualMode 800, Maintenance Manual

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11-38 DRU tests
411-2051-500 Draft 00.01 November 1999
Transmit RF output power test
This test measures the power output of the TRU, the MCPA and the transmit
path insertion loss. Since it interrupts service for the shelf and potentially
(depending on system configuration) the whole site, it should be used only
when a problem is suspected and then only during a low traffic period.
This section describes the Transmit RF output power test that can be
performed on the DualMode Radio Unit (DRU). The Transmit RF output
power test setup procedure must be performed before the test.
Transmit RF output power test setup procedure
1. At the MTX, busy and off-line the TRU under test.
2. Connect the interface terminal to the RS-232 port on the front panel of the
TRU under test. Verify that the DRU configurations for TRU power test
initial setup are as listed in Table 11-1.
Note: Ensure that the TRU transmitter is off.
3. Connect the receive input of the communications monitor to the antenna
port of the duplexer. Use a low loss double shielded cable, RG-214 or
equivalent. Figure 11-7 shows the connection setup for the RF output
power test.
Note: If you do not want to interrupt service, connect to the monitor port
of the duplexer instead. The measurement may not be as accurate because
the level is approximately 50 dB down with a tolerance of up to
±
5 dB.
WARNING
RF radiation hazard
Do NOT disconnect any RF cables when transmitters are on.
CAUTION
Service interruption
The service of the shelf/site under test will be affected.
Perform the tests during low traffic period.