11-4
DRU tests
411-2051-500
Draft
00.01
November 1999
mode to be fully IS-54-B compliant, the audio sensitivity is factory set to -18
dBm0. However, the audio sensitivity can be adjusted by performing the
Transmit and the Receive Audio Level tests as described later in this chapter.
Test considerations
This manual outlines the tests that should be performed on a DualMode Radio
Unit (DRU) when it is installed or replaced. It describes tests that can be
performed on the DRU, although not required, in a DualMode 800 Enclosure.
Also described are system checks related to a complete cell site system
containing DRUs. The tests ensure that the DRU provides service to mobile
users and meets the basic operating parameters. The tests are divided into the
following sections in this manual:
•
Installation/Replacement tests—check the operational parameters of the
DRU
•
Transmit tests—check the transmit parameters of the DRU
•
Receive tests—check the receive parameters of the TRU
•
Power output test—checks the transmit power level of the MCPA at the
duplexer
•
Digital tests— the bit error rate loopback test checks that the transmit and
receive paths of the TRU meet the specifications. A digital call through
test checks that TDMA call processing is performed correctly.
Note: The tests apply to both the TRU2 and TRU3 unless otherwise
stated for the individual unit. Currently the TRU3 does not support AMPS
operation and therefore performing the AMPS-related tests (for example,
SAT/ST frequencies, TX/RX audio levels) are not required on the TRU3.
Due to the operating characteristics of the DRU being determined by
software, very few tests are needed upon installation of a TRU or a MCPA
into a TRU shelf or a MCPA shelf respectively.
Tests that can be performed on a DRU as operational checks are outlined in
this chapter. These tests are not required upon installation, replacement, or on
a periodic basis, but are outlined for troubleshooting purposes.
Due to the tests affecting the ability to process calls, it is necessary to “busy
out” and “off-line” the DRUs, from the MTX, before testing begins.
CAUTION
Some of the tests are service affecting at the cell/sector level. If
you do need to perform these tests, schedule your work at a
low traffic period to minimize service interruption to your
customers.
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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