User Manual

Bay Level Offset Calibration – continued

3-80 1X SC4812T–MC BTS Optimization/ATP 5/21/04

DRAFT

BLO Calibration Data File

During the calibration process, the LMF creates a bts–#.cal

calibration (BLO) offset data file (CAL file) in the bts–# folder. After

calibration has been completed, this offset data must be downloaded to

the BBXs using the LMF Download BLO function. An explanation of

the file is shown below.

Due to the size of the file, Motorola recommends printing a

hard copy of a CAL file and refer to it for the following

descriptions.

NOTE

The CAL file is subdivided into sections organized on a per slot basis (a

slot Block).

Slot 1 contains the calibration data for the 12 BBX slots. Slot 20

contains the calibration data for the redundant BBX. Each BBX slot

header block contains:

S A creation Date and Time – broken down into separate parameters of

createMonth, createDay, createYear, createHour, and createMin.

S The number of calibration entries – fixed at 720 entries corresponding

to 360 calibration points of the CAL file including the slot header and

actual calibration data.

S The calibration data for a BBX is organized as a large flat array. The

array is organized by branch, sector, and calibration point.

– The first breakdown of the array indicates which branch the

contained calibration points are for. The array covers transmit, main

receive and diversity receive offsets as follows:

Table 3-32: BLO BTS.cal File Array Assignments

Range Assignment

C[1]–C[240] Transmit

C[241]–C[480] Main Receive

C[481]–C[720] Diversity Receive

– The second breakdown of the array is per sector. Configurations

supported are Omni, 3–sector or 6–sector.