User Manual

Bay Level Offset Calibration – continued
Jan 2002
3-85
SC4812ET BTS Optimization/ATP — CDMA LMF
BLO Calibration Data File
During the calibration process, the LMF creates a calibration (BLO) data
file. After calibration has been completed, this offset data must be
downloaded to the BBXs using the Download BLO function. An
explanation of the file is shown below.
Due to the size of the file, Motorola recommends that you
print out a hard copy of a bts.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 (see Table 3-39).
Each BBX slot header block contains:
 A creation Date and Time – broken down into separate parameters of
createMonth, createDay, createYear, createHour, and createMin.
 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.
 The calibration data for a BBX is organized as a large flat array. The
array is organized by branch, BBX slot, 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 3-38: BLO BTS.cal file Array Branch Assignments
Range Assignment
C[1]–C[240] Transmit
C[241]–C[480] Receive
C[481]–C[720] Diversity Receive
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