User's Manual

Troubleshooting: RFDS
FEB 2005 1X SC 4812T Lite BTS Optimization/ATP 6-29
PRELIMINARY
Introduction
The RFDS is used to perform Pre–Calibration Verification and
Post-Calibration Audits that limit-check the RFDS-generate and
reported Receive Levels of every path from the RFDS through the
Directional Coupler Coupled Paths. In the event of test failure, refer to
the following tables.
All Tests Fail
Table 6-31: RFDS Fault Isolation – All Tests Fail Troubleshooting Procedure
Step Action
1 Check the TX Calibration Equipment for proper operation by performing the following actions.
1a Manually set the Signal Generator Output Attenuator to the lowest Output Power Setting.
1b Connect the Output Port to the Spectrum Analyzer RF Input Port.
2 Set the Signal Generator Output Attenuator to –90 dBm, and switch on the RF Output.
3 Verify that the Spectrum Analyzer can do the following:
– Receive the signal.
– Indicate the correct Signal Strength (accounting for the Cable Insertion Loss).
– Indicate the approximate frequency.
4 Visually inspect the RF Cabling.
Make sure that the Directional Coupler Forward Port and Reflected Port are connected to the RFDS
Antenna Select Unit on the RFDS.
5 Check the wiring against the Site Documentation Wiring Diagram or the 1X SC4812T Lite Hardware
Installation manual (68P09262A57)
6 Verify that all changes to the RFDS Parameter Settings have been downloaded.
7 Status the TSU to verify that the TSIC and SUA Software Versions are correct.
8 Check to see that all RFDS Cards show green on the Front Panel LEDs.
9 Visually check for external damage.
10 If any card LEDs do not show green, replace the RFDS with a known–good unit.
– Re–test after replacement.
All RX and TX Paths Fail
If every Receive or Transmit Path fails, the problem most likely lies with
the RF Converter Card or the Transceiver Card. Replace the RFDS with
a known–good unit and retest.
6