User's Manual

Troubleshooting: Calibration68P09255A69-3

Aug 2002

1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x

PRELIMINARY

6-11

Calibration Audit Failure

Table 6-12: Troubleshooting Calibration Audit Failure

 Step Action

1 Verify the power meter or communications system analyzer is configured correctly (see the Test

Equipment Set-up section of Chapter 3), and is connected to the proper BTS TX antenna

connector.

2 If a power meter is being used:

2a - Re-calibrate the Power Meter and verify it is calibrated correctly with cal factors from the

power sensor (refer to Appendix F).

2b - Verify the power sensor is functioning properly by checking it with the 1-mW (0 dBm) Power

Ref signal.

2c - Verify communication between the LMF and Power Meter is working by checking that the

meter display is showing RES :

3 Verify that no LPA on the carrier is in alarm state (rapidly flashing red LED).

3a - If any are, reset the LPA(s) by pulling the applicable circuit breaker on the DC PDA, and,

after 5 seconds, pushing back in.

4 After calibration, the BLO data must be re-loaded to the BBXs before auditing. Click on the

BBX(s), and in the BTS menu bar select Device > Download >BLO.

Re-try the audit.

5 Verify GPIB adapter is not locked up. Under normal conditions, only 2 green LEDs must be ‘ON’

(Power and Ready). If any other LED is continuously ‘ON’, power-cycle (turn power off and on)

the GPIB Box and retry.

6 If calibration was being performed for the redundant BBX, be sure the Single-Sided BLO

checkbox was not checked in the CDMA Test Parameters test set-up window.

7 If additional items, such as directional couplers or combiners, have been installed in the TX path,

be sure that one of the following has been done:

 Verify BLO checkbox in the CDMA Test Parameters test set-up window is unchecked.

 The additional path losses have been added into each applicable sector using the Util > Edit >

TX Coupler Loss... function.