User's Manual

Bay Level Offset Calibration – continued
FEB 2005 1X SC 4812T Lite BTS Optimization/ATP 3-113
PRELIMINARY
S Expansion Frame Diversity RX Path – The Starter Frame Main RX
Signal is used for the Expansion Frame Diversity RX Signal. An
Expansion Frame’s Diversity RX Path starts at ANTENNAS
Connectors 1A, 2A, or 3A in the Starter Frame. It travels through the
associated TRF or DRF, the MPC in SCCP Cage MPC–1 Slot, and the
CIO Card where it is then routed out of the frame through the RX
Expansion Out Connectors (RX EXPANSION 1A, 2A, or 3A).
The signal travels through the Inter–frame Diversity RX Cables, into
the RX Expansion In Ports (RX EXPANSION 1B, 2B, or 3B) of the
Expansion Frame, through the Expansion MPC (EMPC) in SCCP
Cage MPC–2 Slot, the CIO, and terminates at a Backplane BBX Slot
in the SCCP Cage.
S RFDS sampling paths – Directional Couplers for RFDS signal
sampling are integral to the SC4812T Lite Transmit and Receive Paths
in the DRFs and TRFs. Cables connect from these Directional
Couplers to the RFDS Input Connectors.
Component Verification During
Calibration
TX Path Calibration
TX Path Calibration supports verification of correct BTS installation, RF
Cabling installation and performance, functionality of all equipment
installed in the Transmit RF Chain, and the proper functioning of each
Transmit RF Path. External Test Equipment is used to calibrate and audit
the TX Paths of the BTS.
RX Path Calibration
RX Path Calibration is not required or supported on CDMA BTS
systems. Default RX Calibration Values are written to the RX
Calibration Data Files during the TX Calibration process. RX
Functionality is verified during Frame Erasure Rate (FER) Testing.
When to Calibrate BLOs
Calibration to determine BLO:
1. Is required after Initial BTS Installation.
2. Must be done once each year for an operational BTS Site.
3. Is recommended by Motorola for all associated RF Paths after
replacing any of the following components.
– BBX Card
– SCCP Cage
– CIO Card
– CIO–to–PA Trunking Module RF Cable
– PA Trunking Module
– Power Amplifier
– Trunking Module–to–TX Filter/Filter Combiner RF Cable
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