User's Manual

Basic Troubleshooting: RF Path Fault Isolation
68P64115A18–1
Mar 2003
1X SC 4812T Lite BTS Optimization/ATP Software Release R2.16.1.x
DRAFT
6-14
TX Power Output Fault Isolation Flowchart
Figure 6-1: TX Output Fault Isolation Flowchart
Start
TX Power
Out of Limits
No
No, everything fails
If equipped, does a
BBX on a different
carrier but for the
same sector
pass?
Yes, it passes.
Likely Cause: Crossed TX cabling to include:
– CIO–trunking module,
– Trunking module–filter/combiner,
– Filter/combiner–DRDC/TRDC
Carrier LPAs
Also check: Carrier trunking module
CIO card.
Did TX Output
fail the High or
Low limit?
High limit
failure.
Does
redundant BBX
have the same
problem on the
same sector?
Likely Cause: BBX card
Attempt re–calibration
before replacement.
No
Does any other
sector have the
same problem?
Likely Cause: CIO card
Carrier trunking module
Also check: CIO–trunking module cabling
TX filter/combiner cabling
TX DRDC/TRDC cabling
Likely Cause: External Power Measurement
Equipment and/or Set–up.
Also check: Switch card
External Attenuators & Pads,
Check Site Documentation.
Yes
Yes
Low limit
failure.
Likely Cause: CIO card not fully seated
External Power Measurement
Equipment and/or Set–up
Crossed TX cabling to include:
– CIO–trunking module,
– Trunking module–filter/combiner,
– Filter/combiner–DRDC/TRDC
Yes, it passes.
If equipped, does a
BBX on the same
carrier but for a
different sector
pass?
No, next BBX on same carrier
fails on different sector.
Likely Cause: BBX card
Loose connections on
CIO–trunking module cabling,
TX filter/combiner cabling, or
TX DRDC/TRDC cabling
Also check: CIO card
Carrier trunking module
6