User's Manual

Troubleshooting: Transmit ATP68P64115A18–1

Mar 2003

1X SC 4812T Lite BTS Optimization/ATP Software Release R2.16.1.x

DRAFT

6-15

Troubleshooting: Transmit ATP

BTS Passed Reduced ATP Tests but Has Forward Link Problem in Normal

Operation

Follow the procedure in Table 6-13 to troubleshoot a forward link

problem during normal operation after passing a reduced ATP.

Table 6-13: Troubleshooting Forward Link Failure (BTS Passed Reduced ATP)

n Step Action

1 Perform the following additional tests to troubleshoot a forward link problem:

1a – TX mask

1b – TX rho

1c – TX code domain

Cannot Perform TX Mask Measurement

Table 6-14: 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

Table 6-15: 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 MGLI code and 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 (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.