User's Manual

Bay Level Offset Calibration
68P09255A69-3
Aug 2002
1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x
PRELIMINARY
3-80
from 2500 to 27500 (2500 corresponds to -125 dBm and 27500
corresponds to +125 dBm).
- The ten calibration points for each slot-branch combination must be
stored in order of increasing frequency. If less than ten points
(frequencies) are calibrated, the BLO data for the highest frequency
calibrated is written into the remainder of the ten points for that
slot-branch.
Example:
C[1]=384
(odd cal entry)
C[2]=19102 (even cal entry)
C[3]=777 (odd cal entry)
C[4]=19086 (even cal entry)
C[19]=777 (odd cal entry)
C[20]=19086 (even cal entry)
.
.
.
= 1 “calibration point”
= 1 “calibration point”
= 1 “calibration point”
In the example above, BLO was measured at only two frequencies
(channels 384 and 777) for SCCP slot BBX-1 transmit (Table 3-37).
The BLO data for the highest frequency measured (channel 777) will
be written to the remaining eight transmit calibration points (defined
by entries C[5] through C[20]) for BBX-1.
Slot Block Temperature Compensation - Each BBX slot Block also
has a temperature compensation data section (TempLevelCal) where
power level compensation factors for temperature variations are stored.
CAL File and BLO Data Download
When BLO data is downloaded to the BBXs after calibration, the data is
downloaded to the devices in the order it is stored in the CAL file. TX
calibration data (entries C[1] - C[60]) are sent first. Data for the ten
BBX slot 1 calibration points (entries C[1] - C[20]) are sent initially,
followed by data for the ten BBX slot 2 calibration points (entries C[21]
- C[40]), and so on. The RX calibration data is sent next in BBX slot
sequence, followed by RX Diversity calibration data.
Test Equipment Setup for RF Path Calibration
Follow the steps outlined in Table 3-38 and refer as needed to
Figure 3-13 or Figure 3-14 to set up test equipment.
Table 3-38: Set Up Test Equipment for RF Path Calibration
Step Action
1 If it has not already been done, refer to the procedure in Table 3-10 to interface the LMF
computer terminal to the frame LAN A connector.
2 If it has not already been done, refer to Table 3-11 to start a GUI LMF session.
3 If required, calibrate the test equipment per the procedure in Table 3-30.
3