User's Manual

Bay Level Offset Calibration
68P09258A31–A
Oct 2003
1X SCt 4812T BTS Optimization/ATP
3-94
Download BLO Procedure
After a successful TX path calibration, download the bay level offset
(BLO) calibration file data to the BBXs. BLO data is extracted from the
CAL file for the Base Transceiver Subsystem (BTS) and downloaded to
the selected BBX devices.
NOTE
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.
Prerequisites
Ensure the following prerequisites have been met before proceeding:
S BBXs being downloaded are OOS–RAM (yellow).
S TX calibration is successfully completed.
Follow the steps in Table 3-38 to download the BLO data to the BBXs.
Table 3-38: Download BLO
n Step Action
1 Select the BBX(s) to be downloaded.
2 Click Device in the BTS menu bar, and select Download
> BLO from the pull–down menus. 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 BBX 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.
NOTE
RF path verification, BLO calibration, and BLO data download
to BBXs must have been successfully completed prior to
performing the calibration audit.
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