User's Manual

Bay Level Offset Calibration – continued
PRELIMINARY
1X SCt4812ET Lite BTS Optimization/ATP
08/01/2001
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BLO Calibration Data File
During the calibration process, the CDMA LMF creates a calibration
(CAL) data file where BLO values are stored. After calibration has been
completed, this offset data must be downloaded to the BBX2s using the
CDMA LMF Download BLO function. An explanation of the file is
shown below.
Due to the size of the file, Motorola recommends printing
out a copy of a bts.cal file and referring to it for the
following descriptions.
NOTE
The CAL file is subdivided into sections organized on a per–slot basis (a
slot Block).
The Slot 1 Block contains the calibration data for the six BBX2 slots.
The Slot 20 Block contains the calibration data for the redundant BBX2
(see Table 3-32). Each BBX2 slot Block header 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 – plus the slot Block format.
Within the slot Block body, the BBX2 calibration data (BayLevelCal) is
organized as a large flat array. The array is organized by branch, BBX2
SCCP cage slot, and calibration point.
S 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 3-31: BLO BTS.cal file Array Branch Assignments
Range Branch Assignment
C[1]–C[120] Transmit
C[121]–C[240] No SC4812ET Lite BLO cal
point entries (default only)
C[241]–C[360] Receive
C[361]–C[480] No SC4812ET Lite BLO cal
point entries (default only)
C[481]–C[600] Diversity Receive
C[601]–C[720] No SC4812ET Lite BLO cal
point entries (default only)
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