User's Manual

Bay Level Offset Calibration – continued
SC 4812T CDMA BTS Optimization/ATP
May 2000
3-66
Download BLO Procedure
After a successful TX path calibration, download the bay level offset
(BLO) calibration file data to the BBX2s. BLO data is extracted from the
CAL file for the Base Transceiver Subsystem (BTS) and downloaded to
the selected BBX2 devices.
If a successful All Cal/Audit was completed, this
procedure does not need to be performed, as BLO is
downloaded as part of the All Cal/Audit.
NOTE
Prerequisites
Ensure the following prerequisites have been met before proceeding:
 BBXs being downloaded are OOS–RAM (yellow).
 TX calibration is successfully completed.
Follow the procedure in Table 3-34 to download the BLO data to the
BBX2s.
Table 3-34: Download BLO
 Step Action
1 Select the BBX2(s) to be downloaded.
2 From the Device menu, select Download BLO.
A status report window displays the result of the download.
NOTE
Selected device(s) do not change color when BLO is downloaded.
3 Click on OK to close the status report window.
Calibration Audit Introduction
The BLO calibration audit procedure confirms the successful generation
and storage of the BLO calibration offsets. 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