11-44
DRU tests
411-2051-500
Draft
00.01
November 1999
Bit error rate test at the MTX switch
Bit Error Rate (BER) is defined as the ratio of erroneous bits to the total
number of received bits in a transmission system. Typically, BER tests are
performed on suspect equipment. However, external factors such as strong
electromagnetic conditions, multi-path effects and environmental conditions
like lightning may also cause high BER levels and need to be considered
when a BER test fails.
In the outbound direction (from Digital Signal Processing Module to
DualMode Radio Unit), the BER test generates a pseudo-random bit stream
(PRBS) onto the selected TDMA time slot. In the inbound direction, the BER
test expects to receive the same bit pattern. After a short self-synchronization
time period, the bit error rate is measured.
Note: The TRU3 does not support this test (that is, the MRBT test).
Step
Action
Observation
1
Ensure that the following tables have been
datafilled.
Table CTTPARMS
Table PMLOADS
Table TERMATTR
Table CSMINV
Tuples shown are examples only. They may
look different on your screen.
Table CTTPARMS has a tuple for the cell
under test and range TESTNAME says
“MRBT”
TABLE CTTPARMS
PARMNAME TSTPARMS
---------------------------------------------
MRBT MRVT MRBT 6000000 6000 6000 NOSTOP
TABLE: PMLOADS
LOADNAME DEVICE
-----------------------------------------------
DM2_AE25 D000PMLOADS
TABLE: TERMATTR
ATTRIBUTE PEC_CODE LOAD PADPEC CSPM HWTYPE
----------------------------------------------
AE25 AX40DA DM2_AE25 NOPAD ICRM DRUM
TABLE: CSMINV
CSMKEY MIN SERNO TERMATTR CARD PORT ALARMPT
-----------------------------------------------
495 0 214 234 0095 142 571 AE25 8 15 0
2
Ensure that the DRUM is in service.
>MAPCI;MTC;MTX
>
POST CELL {cell #};CTU {ctu #}
Verify that the DRUM indicates INSV.
- continued -
Summary of Contents for DualMode 800
Page 2: ......
Page 4: ......
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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