11-22
DRU tests
411-2051-500
Draft
00.01
November 1999
DRU receive tests
This section describes the receive tests that can be performed on the
DualMode Radio Unit (DRU).
Note: The tests can be performed separately but the DRU receive test
setup procedure must be performed before each individual test.
Service impacts
The receive tests cause a reduction in the receive performance of the shelf
containing the radio under test because of the loss of receive diversity.
The TRU transmit tests must be performed before the receive tests to verify
the TRU’s transmit path. This is because the TRU uses an RF loopback to
access the base-band receive signal. Failure to verify the TRU transmit path
may result in invalid test data.
Receive 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 TRU configurations for RX tests initial
setup are as listed in Table 11-1.
3. Connect the transmit output of the communications monitor to the
antenna input connector on the back of the TRU shelf for the antenna
under test. Connect the receive input of the communications monitor to
the sniffer port of the duplexer for the TRU under test. Use low loss
double shielded cables, RG-214 or equivalent. Figure 11-5 shows the
setup for the receive tests.
4. From the terminal, select the channel assigned to the DRU under test by
using the B command.
>B
WARNING
RF radiation hazard
Do NOT disconnect any RF cables when transmitters are on.
CAUTION
Service interruption
The service of the shelf housing the TRU under test will be
affected. Perform the tests during low traffic period.
Summary of Contents for DualMode 800
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Page 6: ...vi Publication history Nortel Networks Confidential 411 2051 500 Draft 00 01 November 1999...
Page 82: ...2 20 Periodic maintenance 411 2051 500 Draft 00 01 November 1999...
Page 90: ...3 8 Test equipment and precautions 411 2051 500 Draft 00 01 November 1999...
Page 100: ...5 6 Master Oscillator tests 411 2051 500 Draft 00 01 November 1999...
Page 106: ...6 6 Antenna and transmission line tests 411 2051 500 Draft 00 01 November 1999...
Page 116: ...8 4 Alarm Control Unit ACU tests 411 2051 500 Draft 00 01 November 1999...
Page 138: ...10 2 ICRM tests 411 2051 500 Draft 00 01 November 1999...
Page 200: ...12 10 Enclosure maintenance 411 2051 500 Draft 00 01 November 1999...
Page 208: ...A 8 Appendix A Frequency table 411 2051 500 Draft 00 01 November 1999...
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