User Manual
Bay Level Offset Calibration – continued
Jan 2002
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SC4812ET BTS Optimization/ATP — CDMA LMF
CDF – This pattern setting is for advanced users who need to use CDF
gain settings for all channels included in the Standard pattern setting
(pilot, paging, synch, and six traffic). Using this pattern setting requires
the selection of both a BBX and at least one MCC.
Verify BLO
In both the TX Calibration and All Cal/Audit dialog boxes, a Verify
BLO checkbox is provided and checked by default. After the actual TX
calibration is completed during either the TX Calibration or All
Cal/Audit process, the BLO derived from the calibration is compared to
a standard, acceptable BLO tolerance for the BTS. In some installations,
additional items may be installed in the transmit path. The additional
change in gain from these items could cause BLO verification failure
and, therefore, failure of the entire calibration. In these cases, either the
Verify BLO checkbox should be unchecked or the additional path losses
should be added into each applicable sector using the
Util>Edit>TX Coupler Loss function.
Single–Sided BLO
Normally valid values are some value plus–or–minus some offset. If
single–sided BLO” is selected, the result will only be considered a
success if it’s in the lower half of the range. If it was normally success
from 37–47 (which is 42
± 5), single–sided BLO” would make it a
success only if the result was from 37–42.
Prerequisites
Before running this test, ensure that the following have been done:
CSM–1, GLIs, MCCs, and BBXs have correct code load and data
load.
Primary CSM and MGLI are INS.
All BBXs are OOS_RAM.
Test equipment and test cables are calibrated and connected for TX
BLO calibration.
LMF is logged into the BTS.
Connect the test equipment as shown in Figure 3-11 and Figure 3-12 and
follow the procedure in Table 3-41 to perform the TX calibration test.
Before installing any test equipment directly to any TX
OUT connector, first verify there are no CDMA BBX
channels keyed. Failure to do so can result in serious
personal injury and/or equipment damage.
WARNING
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