User's Manual
Table Of Contents
- Contents
- Chapter 1 Introduction
- Chapter 2 Preliminary Operations
- 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
- Using the LMF
- Pinging the Processors
- Download the BTS
- CSM System Time - GPS & LFR/HSO Verification
- Test Equipment Set-up
- Test Set Calibration
- Background
- Calibration Procedures Included
- GPIB Addresses
- Selecting Test Equipment
- Manually Selecting Test Equipment in a Serial Connection Tab
- Automatically Selecting Test Equipment in the Serial Connection Tab
- Calibrating Test Equipment
- Calibrating Cables Overview
- Calibrating Test Cabling using Communications System Analyzer
- Calibrate Test Cabling Using Signal Generator & Spectrum Analyzer
- Setting Cable Loss Values
- Setting TX Coupler Loss Value
- Bay Level Offset Calibration
- Purpose of Bay Level Offset Calibration
- What is BLO Calibration?
- Component Verification During Calibration
- When to Calibrate BLOs
- BLO Calibration Data File
- Test Equipment Setup for RF Path Calibration
- Transmit (TX) Path Calibration Description
- TX Calibration and the LMF
- TX Calibration
- All Cal/Audit and TX Calibration Procedure
- Download BLO Procedure
- Calibration Audit Introduction
- TX Path Audit
- TX Audit Test
- Create CAL File
- RFDS Set-up and Calibration
- Alarms Testing
- Chapter 4 Automated Acceptance Test Procedures
Bay Level Offset Calibration68P64115A18–1
Mar 2003
1X SC 4812T Lite BTS Optimization/ATP Software Release R2.16.1.x
DRAFT
3-83
Bay Level Offset Calibration
Purpose of Bay Level Offset Calibration
Bay Level Offset (BLO) calibration is the central activity of the
optimization process. BLO calibration compensates for normal
equipment variations within the BTS RF paths and assures the correct
transmit power is available at the BTS antenna connectors to meet site
performance requirements.
What is BLO Calibration?
Description
BLO calibration is the complete title of what is normally referred to as
“calibration.” Calibration identifies the accumulated gain in every
transmit path at the BTS site. The transmit path BLO values determined
during calibration are stored in the LMF calibration data file, and are
subsequently downloaded to each BBX. When transmit path calibration
is performed, receive path BLO values will automatically be set to the
default value in the LMF calibration file and downloaded.
BTS RF Path Descriptions
Transmit (TX) path – A TX path starts at an SCCP shelf BBX
backplane slot, travels through the CIO card, is routed to the Power
Amplifier (PA) trunking module for sector phase shifting, through the
PAs, back through the PA trunking module for sector phase selection,
through the TX bandpass filter (starter frames) or 2:1 TX combiner
(companion frames), through the Transmit & Receive Filter (TRF) or
Duplexer TX/RF Filter (DRF), and ends at the TRF or DRF antenna
connector.
Receive (RX) main path – A main RX path starts at ANTENNAS
connectors 1A, 2A, or 3A and travels through the associated TRF or
DRF, the MPC in SCCP cage slot MPC–1, the CIO card, and terminates
at a backplane BBX slot in the SCCP shelf.
Diversity RX path – Diversity RX paths differ for SC4812T Lite starter
(stand–alone) and companion frames. The following describe each type
of path:
S Starter frame diversity RX path – A starter frame diversity RX path
is the same as a main RX path except that it starts at ANTENNAS
connectors 1B, 2B, or 3B, travels through the associated TRF or DRF,
and the MPC card in SCCP cage slot MPC–2 (refer to Table 1-6).
S Companion frame diversity RX path – The companion frame main
RX signal is used for the collocated companion frame diversity RX
signal. A companion frame’s diversity RX path starts at ANTENNAS
connectors 1A, 2A, or 3A in the collocated companion frame. It
travels through the associated TRF or DRF, the MPC in SCCP cage
slot MPC–1, and the CIO card where it is then routed out of the frame
through the RX expansion out connectors (RX EXPANSION 1A, 2A,