User's Manual

Troubleshooting: Transmit ATP68P09258A31–A
Oct 2003
1X SCt 4812T BTS Optimization/ATP
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Troubleshooting: Transmit ATP
BTS passed Reduced ATP tests but has forward link problem during normal
operation
Follow the procedure in Table 6-10 to troubleshoot a Forward Link
problem during normal operation.
Table 6-10: Troubleshooting Forward Link Failure (BTS Passed Reduced ATP)
n Step Action
1 Perform these additional TX tests to troubleshoot a forward link problem:
– TX mask
– TX rho
– TX code domain
Cannot Perform TX Mask Measurement
Follow the procedure in Table 6-11 to troubleshoot a TX mask
measurement failure.
Table 6-11: Troubleshooting TX Mask Measurement Failure
n Step Action
1 Verify that TX audit passes for the BBX(s).
2 If performing manual measurement, verify analyzer setup.
3 Verify that no LPA in the sector is in alarm state (flashing red LED).
Re-set the LPA by pulling the circuit breaker and, after 5 seconds, pushing it back in.
Cannot Perform Rho or Pilot Time Offset Measurement
Follow the procedure in Table 6-12 to troubleshoot a rho or pilot time
offset measurement failure.
Table 6-12: Troubleshooting Rho and Pilot Time Offset Measurement Failure
n Step Action
1 Verify presence of RF signal by switching to spectrum analyzer screen.
2 Verify PN offsets displayed on the analyzer is the same as the PN offset in the CDF file.
3 Re–load BBX data and repeat the test.
4 If performing manual measurement, verify analyzer setup.
5 Verify that no LPA in the sector is in alarm state (flashing red LED). Reset the LPA by pulling the
circuit breaker and, after 5 seconds, pushing back in.
6 If Rho value is unstable and varies considerably (e.g. .95,.92,.93), this may indicate that the GPS
is still phasing (i.e., trying to reach and maintain 0 freq. error).
Go to the freq. bar in the upper right corner of the Rho meter and select Hz. Press <Shift–avg>
and enter 10, to obtain an average Rho value. This is an indication the GPS has not stabilized
before going INS and may need to be re-initialized.
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