User Manual

Troubleshooting: Transmit ATP – continued

Jan 2002

6-9

SC4812ET BTS Optimization/ATP — CDMA LMF

Table 6-12: Troubleshooting Rho and Pilot Time Offset Measurement Failure

 ActionStep

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.

Cannot Perform Code Domain

Power and Noise Floor

Measurement

Follow the procedure in Table 6-13 to troubleshoot code domain and

noise floor measurement failure.

Table 6-13: Troubleshooting Code Domain Power and Noise Floor Measurement Failure

 Step Action

1 Verify presence of RF signal by switching to spectrum analyzer screen.

2 Verify PN offset displayed on analyzer is same as PN offset being used in the CDF file.

3 Disable and re-enable MCC (one or more MCCs based on extent of failure).

Cannot Perform Carrier

Measurement

Follow the procedure in Table 6-14 to troubleshoot carrier measurement

failure.

Table 6-14: Troubleshooting Carrier Measurement Failure

 Step Action

1 Perform the test manually, using the spread CDMA signal. Verify High Stability 10 MHz

Rubidium Standard is warmed up (60 minutes) and properly connected to test set-up.