User's Manual
Table Of Contents
- Table of Contents
- List of Figures
- List of Tables
- Foreword
- FCC Requirements
- General Safety
- Revision History
- Patent Notification
- Chapter 1 Introduction
- Chapter 2 Preliminary Operations
- Chapter 3 Optimization/Calibration
- Optimization/Calibration - Introduction
- Isolate Span Lines/Connect LMF
- Preparing the LMF
- Using CDMA LMF
- Download the BTS
- CSM System Time/GPS and LFR/HSO Verification
- Test Equipment Set-up
- Test Set Calibration
- Bay Level Offset Calibration
- RFDS Set-up and Calibration
- BTS Redundancy/Alarm Testing
- BTS Alarms Testing
- Preliminary Operations: Overview
- Pre-Power-up Tests
- Initial Power-up Tests
- Chapter 4 Automated Acceptance Test Procedure
- Automated Acceptance Test Procedures - All-inclusive TX & RX
- TX Output Acceptance Tests: Introduction
- TX Spectral Purity Transmit Mask Acceptance Test
- TX Waveform Quality (rho) Acceptance Test
- TX Pilot Time Offset Acceptance Test
- TX Code Domain Power/Noise Floor Acceptance Test
- RX Frame Error Rate (FER) Acceptance Test
- Generate an ATP Report
- Chapter 5 Prepare to Leave the Site
- Chapter 6 Basic Troubleshooting
- Basic Troubleshooting Overview
- Troubleshooting: Installation
- Troubleshooting: Download
- Troubleshooting: Calibration
- Troubleshooting: Transmit ATP
- Troubleshooting: Receive ATP
- Troubleshooting: CSM Check-list
- C-CCP Backplane Troubleshooting
- Module Front Panel LED Indicators and Connectors
- Basic Troubleshooting - Span Control Link
- Appendix A Data Sheets
- Appendix B PN Offset/I & Q Offset Register Programming Information
- Appendix C FRU Optimization/ATP Test Matrix
- Appendix D BBX Gain Set Point vs. BTS Output
- Appendix E CDMA Operating Frequency
- Appendix F PCS Interface Setup for Manual Testing
- Appendix G VSWR
- Appendix H Download ROM Code
- Appendix I In-Service Calibration
- Appendix J GPIB Addresses
- Introduction
- HP437 Power Meter GPIB Address
- Gigatronics 8541C Power Meter GPIB Address
- Motorola CyberTest GPIB Address
- HP8935 Test Set GPIB Address
- Setting HP8921A and HP83236A/B GPIB Address
- Advantest R3465 GPIB Address
- RS232 GPIB Interface Box
- Advantest R3267 Spectrum Analyzer GPIB Address
- Agilent E4406A Transmitter Tester GPIB Address
- Index
Bay Level Offset Calibration
68P09255A61-4
Aug 2002
1X SC 4812T BTS Optimization/ATP Software Release 2.16.1.x
FIELD TRIAL
3-68
Bay Level Offset Calibration
Introduction to Bay Level Offset Calibration
Calibration compensates for normal equipment variations within the
BTS and assures maximum measurement accuracy.
RF Path Bay Level Offset Calibration
Calibration identifies the accumulated gain in every transmit path (BBX
slot) at the BTS site and stores that value in a BLO database calibration
table in the LMF. The BLOs are subsequently downloaded to each BBX.
For starter frames, each receive path starts at a BTS RX antenna port and
terminates at a backplane BBX slot. Each transmit path starts at a BBX
backplane slot, travels through the LPA, and terminates at a BTS TX
antenna port.
For expansion frames each receive path starts at the BTS RX port of the
cell site starter frame, travels through the frame-to-frame expansion
cable, and terminates at a backplane BBX slot of the expansion frame.
The transmit path starts at a BBX backplane slot of the expansion frame,
travels though the LPA, and terminates at a BTS TX antenna port of the
same expansion frame.
Calibration identifies the accumulated gain in every transmit path (BBX
slot) at the BTS site and stores that value in a BLO database. Each
transmit path starts at a C-CCP shelf backplane BBX slot, travels
through the LPA, and ends at a BTS TX antenna port. When the TX path
calibration is performed, the RX path BLO is automatically set to the
default value.
At omni sites, BBX slots 1 and 13 (redundant) are tested. At sector sites,
BBX slots 1 through 12, and 13 (redundant) are tested. Only those slots
(sectors) actually equipped in the current CDF are tested, regardless of
physical BBX board installation in the slot.
When to Calibrate BLOs
Calibration of BLOs is required:
After initial BTS installation
Once each year
After replacing any of the following components or associated
interconnecting RF cabling:
- BBX board
- C-CCP shelf
- CIO card
- CIO to LPA backplane RF cable
- LPA backplane
-LPA
- TX filter / TX filter combiner
- TX thru-port cable to the top of frame
3