User's Manual Part 3

Bay Level Offset Calibration – continued

Mar 2001

3-71

SCt4812T CDMA BTS Optimization/ATP

DRAFT

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.

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 3-35 to download the BLO data to the

BBXs.

Table 3-35: Download BLO

 Step Action

1 Select the BBX(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 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.

RF path verification, BLO calibration, and BLO data

download to BBXs must have been successfully completed

prior to performing the calibration audit.

IMPORTANT