User's Manual

Purpose of the Optimization
68P09255A69-3
Aug 2002
1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x
PRELIMINARY
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Purpose of the Optimization
Why Optimize?
Proper optimization and calibration ensures that:
 Accurate downlink RF power levels are transmitted from the site.
 Accurate uplink signal strength determinations are made by the site.
What Is Optimization?
Optimization compensates for the site-specific cabling and normal
equipment variations. Site optimization guarantees that the combined
losses of the new cables and the gain/loss characteristics and built-in
tolerances of each BTS frame do not accumulate and cause improper site
operation.
What Happens During Optimization?
Overview - During optimization, the accumulated path loss or gain is
first determined for each RF transmit path in the BTS. These transmit
path loss or gain values are then stored in a database along with RF
receive path default values.
RF path definitions - For definitions of the BTS transmit (TX) and
receive (RX) paths, see “What is Bay Level Offset Calibration?” in the
Bay Level Offset Calibration section of Chapter 3.
RF paths and transceiver optimization - Six of the seven Broad Band
Transceiver (BBX) boards in each SCCP shelf are optimized to specific
RX and TX antenna connectors. The seventh BBX board acts in a
redundant capacity for BBX boards 1 through 6, and is optimized to all
antenna connectors. A single optimization value is generated for each
complete path. This eliminates the accumulation of error that would
occur from individually measuring and summing the gain and loss of
each element in the path.
Using RF path gain/loss values - BTS equipment factors in the derived
optimization values internally to adjust transceiver power levels, leaving
only site-specific antenna feedline loss and antenna gain characteristics
to be factored in by the CFE when determining required site Effective
Radiated Power (ERP) output power levels.
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