User Manual

RFDS – Fault Isolation – continued

Jan 2002

6-21

SC4812ET BTS Optimization/ATP — CDMA LMF

All tests fail on a single

antenna

If all path failures are on one antenna port, forward and/or reflected,

follow the procedures in Table 6-28 checks.

Table 6-28: RFDS Fault Isolation – All tests fail on single antenna path

Step Action

1 Visually inspect the site interface cabinet internal cabling to the suspect directional coupler antenna

port.

2 Verify the forward and reflected ports connect to the correct RFDS antenna select unit positions on the

RFDS backplane. Refer to the installation manual for details.

3 Visually check ASU connectors (both board and backplane) for damage.

4 Replace the ASU with a known good ASU.

5 Replace the RF cables between the affected directional coupler and RFDS.

NOTE

Externally route the cable to bypass suspect segment.