Troubleshooting Path Problems - Alcatel-Lucent 9500 MPR User Manual

• Check the basics first.
• For example, if multiple alarms are present, and these include power supply
voltage or hardware alarms, always check their cause before looking at result-
ant down-stream path failure or path warning (signal) alarms.
• Similarly, if a path-related failure is indicated (no hardware or software
alarms), investigate the path. Go to the Craft Terminal History screen (15
minute view) to check supporting data, such as low RSL and incidence of inter-
mittent pre-failure BER alarms, which if present are evidence of a path-related
failure. Refer to
Check if symptoms match the alarm. Alarms reflect the alarm state, but in exceptional cir-
•
cumstances an alarm may be raised because of a failure to communicate correctly with
the alarm source, or a failure in alarm management processing. Always check to see if
symptoms match the alarm, using LED indications and the Craft Terminal.
• Check if recent work may be a cause. Recent work at the site may be a cause or contribut-
ing factor. Check for a configuration change, software upgrade, power recycling
(reboot), or other site work:
• Many hardware alarms are only initiated as a loss-of-communications alarm
during a reboot, software upgrade, or reconfiguration. By not being able to com-
municate with the Core, their settings cannot be loaded. The fault may be at the
hardware device (most likely), communications to it, or the Core.
• Hardware/software compatibility alarms will be raised when a new plug-in is
installed that needs a later version of 9500 MPR software.
• Hardware incompatible alarms will be raised when a plug-in is installed in a
slot that has been configured for a different plug-in.
MSS before an ODU. If there is doubt about whether a fault is in the MSS or ODU,
•
always troubleshoot the MSS first.
Hot-pluggable. MSS cards are hot-pluggable. There is no need to power-down before
•
replacing, but traffic will be lost unless the plug-in is protected.
• Plug-in restoration time. Ensure adequate time is allowed for services to resume when a
plug-in is replaced.
5.4.3

Troubleshooting Path Problems

A path-related problem, with the exception of interference, is characterized by traffic being
similarly affected in both directions. Generally, if you are experiencing only a one-way
problem, it is not a path problem.
A path extends from ODU antenna port to ODU antenna port.
Para. 5.4.3 for more information.
Note
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