User's Manual
BTS Redundancy/Alarm Testing
68P09258A31–A
Oct 2003
1X SCt 4812T BTS Optimization/ATP
3-118
Power Amplifier (PA) Redundancy Test
Follow the procedure in Table 3-55 to verify redundancy of the Power
Amplifiers (PA).
WARNING
First verify there are no BBX channels keyed BEFORE
moving the antenna connection. Failure to do so can result in
serious personal injury and/or equipment damage.
Table 3-55: Power Amplifier Redundancy Test
Step Action
1 From the pulldown menu select:
Device>BBX/MAWI>Set Redundant Sector>Carrier–#–1–1
Device>BBX/MAWI>Set Pilot Only>Carrier–#–1-1
Device>BBX/MAWI>Set Pilot Gain> Carrier–#-1-1 and Pilot Gain = 262
2 Key-up the BBX assigned to the PAs associated with the sector under test (gain = 40).
3 Adjust the communications test set spectrum analyzer, as required, to observe the overall carrier
amplitude and IM Shelf and note for reference. These figures will be required later.
NOTE
See Figure 3-19 for test equipment setup, if required.
4 Push-in and release the breaker supplying the 1st PA of the pair.
NOTE
After power is removed, IM suppression takes a few seconds to settle out while compensating for the
removal of the 1st PA. The overall gain decreases by approximately 6 dB. The process must be
complete before proceeding.
5 Verify:
• The other PA module did not go OOS due to the loss of the PA.
• The overall carrier amplitude is reduced by approximately 6 dB and IM suppression on the analyzer
display remains basically unchanged.
• PA fault message is reported via the MGLI and displayed on the alarm monitor.
6 Re-apply power to the PA module and observe the alarm has cleared on the alarm monitor.
NOTE
All PWR/ALM LEDs should be GREEN at completion of test.
7 Repeat Steps 4 through 6 to verify the 2nd PA of the pair.
8 De-key the BBX.
n WARNING
First verify there are no BBX channels keyed when moving the antenna connection. Failure to do so
can result in serious personal injury and/or equipment damage.
9 Repeat Steps 1 through 8 to verify PAs assigned to sectors 2 and 3 (if equipped). Move the test cable
on top of the BTS to TX OUT 2 and TX OUT 3 antenna connectors as required.
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