User's Manual
Table Of Contents
- Chapter 1: Introduction
- Chapter 2: Preparatory Tasks
- Chapter 3: Optimization/Calibration
- Introduction to Optimization and Calibration
- Preparing the LMF
- Overview of Packet BTS Files
- LMF Features and Installation Requirements
- LMF File Structure Overview
- LMF Home Directory
- NECF Filename Conventions and Directory Location
- LMF Installation and Update Procedures
- Copy BTS and CBSC CDF (or NECF) Files to the LMF Computer
- Creating a Named HyperTerminal Connection for MMI Communication
- Span Lines - Interface and Isolation
- LMF to BTS Connection
- Switching the Active LAN - LMF I/O Panel 10Base-2 LAN Connection
Purpose of the Optimization
FEB 2005 1X SC 4812T Lite BTS Optimization/ATP 1-3
PRELIMINARY
Why Optimize?
Proper Optimization and Calibration ensures that:
S Accurate Downlink RF Power Levels are transmitted from the site.
S 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. Also, 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) Cards in each SCCP
Cage are optimized to specific RX and TX Antenna Connectors. The
seventh BBX Card acts in a redundant capacity for BBX Cards 1
through 6, and is optimized to all Antenna Connectors. A single
Optimization Value is generated or each complete TX and RX 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–specific Effective Radiated Power
(ERP) Output Power Levels.
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