User Manual

Bay Level Offset Calibration – continued
July 1999
3-67
SC 4812ET BTS Optimization/ATP – CDMA LMF
PRELIMINARY 2
Verify all BBX2 boards removed and repositioned have
been returned to their assigned shelves/slots. Any BBX2
boards moved since they were downloaded will have to be
downloaded again.
IMPORTANT
*
Exception Handling
In the event of a failure, the calibration procedure displays a FAIL
message in the status report window and provides information in the
Description field.
Recheck the test setup and connection and re–run the test. If the tests fail
again, note specifics about the failure, and refer to Chapter 7,
Troubleshooting.
Download BLOs to BBX2s
After a successful TX path, download the bay level offset calibration file
data to the BBX2s.
Download BLO Procedure
BLO data is extracted from the CAL file for the BTS and downloaded to
the selected BBX2 devices. The BBX2s being downloaded must be in
the OOS_RAM (yellow) state.
Table 3-37: Download BLO
 Step Action
1 Select the BBX2(s) to be downloaded.
2 From the Device menu, select Download BLO.
3 Click OK to close the status report window.
Calibration Audit Introduction
The BLO calibration audit procedure confirms the successful generation
and storage of the BLO calibrations.
The calibration audit procedure measures the path gain or loss of every
BBX2 transmit path at the site.
In this test, actual system tolerances are used to determine the success or
failure of a test. The same external test equipment set up is used.
*
RF path verification, BLO calibration, and BLO data
download to BBX2s must have been successfully
completed prior to performing the calibration audit.
IMPORTANT
3