Troubleshooting Configuration Problems - Alcatel-Lucent 9500 MPR User Manual

• Mismatching antenna polarizations
Given a typical polarization discrimination of 30 dB, for most links it is not possible to cap-
ture a signal to begin the antenna alignment process.
• Incorrect path calculations
If the RSLs are too low or too high, antenna alignment is correct, and Tx power settings
are correct, check the path calculations used to determine the link performance. A good
calculation match is +/- 2dB. Disagreements in excess of 3 dB should be investigated.
• Reflections
Reflection (path cancellation) problems may not have been picked up at the path planning
stage, particularly if the survey was a simple line-of-sight. If suspected, resurvey the path.
5.4.4 Troubleshooting Configuration Problems
Configuration problems should only occur during the setup of a new link, or reconfigura-
tion of an existing link. The more common problems may be broadly categorized as:
• Compatibility Problems
The two alarms that may activate are Configuration Not Supported and SW/HW Incom-
patible:
Configuration Not Supported: The plug-in installed is not enabled or is incorrect
for the configuration.
SW/HW Incompatible: Typically raised when new hardware is plugged into an
existing MSS that has software from an earlier release. To remove the alarm,
compatible 9500 MPR software is required; install the latest software.
• Incorrect circuit connections
No alarms are activated for incorrect circuit connections. An incorrect assignment means
the expected end-to-end circuit connectivity will not happen. Re-check circuit assignments
for all nodes carrying the lost circuit(s).
Take extra care when configuring ring circuits.
Incorrect ID naming and commissioning
•
All traffic-carrying circuits must have a unique flow ID for the cross-connect capability to
operate.
• Incorrect/incompatible trib settings
Trib line interface settings incorrect, or line levels incompatible. While no alarm activates
for an incorrect setting, its effect may result in line levels being too low (LOS alarm), or too
high, resulting in a high BER.
5-11