Integrity Of Individual Ring Links; Integrity Of The Ring And Ring Circuits - Alcatel-Lucent 9500 MXC User Manual

Integrity of Individual Ring Links

Integrity of the Ring and Ring Circuits

Vol. VI-A-22
• NMS addressing and routing may be set incorrectly. If no nodes other than
the local node are visible, check the gateway setting on your CT PC. Refer
to 9500 MXC User Manual, Volume 4, Chapter 2.
• One or more links on the ring are down, and ring wrapping has not occurred.
• Two or more links are down, ring wrapping has occurred, but the missing
node or nodes are isolated.
Use CT to view the status of the node and the RING RACs up to the point of
discontinuity in a ring. If RING status is OK at this point (no alarms and
performance OK), it suggests a problem with IP addressing at the missing
node(s).
Check each node on the ring for correct, error-free operation:
1. Confirm the System Summary screen shows no alarms.
2. Within Diagnostics > Performance, click Start All, to initiate monitoring. This
must be separately selected for east or west RACs, by clicking on the required
RAC line in the Plug-ins panel.
• Check that Detected Tx Power and RSL agree with the values stated in the
installation datapack.
• Check that the -48v supply is within expected limits.
• For the selected RAC, G.826 stats should be reviewed at intervals to confirm
continued error-free operation.
If alarms are present, or performance data is outside expected values, the reasons
must be checked and any required remedial action completed before a ring is
commissioned.
Check each node on the ring for correct circuits configuration, and confirm
circuits using a BER test on selected tribs.
1. Open Configuration > Circuits > Traffic Circuits, and in the Port to Port
Connections panel check all connections against the master ring circuits
listing.
2. Select a local DAC trib for a BER test. Apply a radio-facing loopback at the
remote end of the trib, and set a BER test.
• If a BER test cannot be set, check the circuit configuration, and the loopback
selection.
• If a BER test can be set, it confirms correct end-to-end circuit assignment.
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