Specifications

Ba y Lev el Offset Calibr ation Appendix E: Optimization and Calibr ation Procedures
Transmit (TX) Path Calibration Description
The Line Maintenance F acility (LMF) will automatically use the channel numbers and power
levels assigned to the UBS if the UBS has been connected to an Operation Maintenance
Center — R adio (OMC -R) and brought into service. If the OMC -R connection has not yet been
established, the LMF operator will have to manually select each calibration point using a
specific channel number and power level for that channel. Bay Level Offset (BLO) calibration
is only applied to the specific channel numbers, thus calibration must be done on the exact
channel number to be used when the site is operational.
TX Calibration and the LMF
The LMF T ests > TX > TX Calibration... and T ests > All Cal/Audit... selections perform TX
BLO calibration testing for the installed RDF . The All Cal/Audit... selection initiates a series of
actions to perform TX calibration, and, if calibration is successful, download BLO and perform TX
audit. The TX Calibration... selection performs only TX calibration. When TX Calibration...
is used, BLO download and TX Audit must be performed as separate activities. The CDMA
T est P arameters window which opens when TX Calibration... or All Cal/Audit... is selected
contains several user–selectable features which are described in the following subsections.
Pilot Generation
Channels / Carrier pick–list containing the list of carriers available for the selected
Sector/Carriers. The list is derived from NECB file. DMI pick–list containing the list of DMIs
being able to generate Pilot signal of selected Sector/Carrier . The list is derived from NECB
file. The list is derived from NECB file. PN non–modifiable text box(es). The value is the
PilotPn derived from NECB files Carrier # Channels: text box(es). Carrier numbers and default
channels are derived from NECB file. Frequency Band non–modifiable text box(es). The value is
the frequency band derived from NECB files.
Verify BLO
In both the TX Calibration and All Cal/Audit dialog boxes, a V erify BLO checkbox is provided
and checked by default. A fter the actual TX calibration is completed during either the TX
Calibration or AllCal/Audit process, the BLO derived from the calibration is compared to a
standard, acceptable BLO tolerance for the UBS . 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
V erify 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.
E -8 68P09283A63 -5
FOA A UG 2007