Cisco Cisco ONS 15600 SDH, Руководство по устранению неисправностей

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Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 2 Alarm Troubleshooting
2.6.59 FAILTOSWS
2.6.59 FAILTOSWS
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
Logical Object: STMN
The Failure to Switch to Protection Span condition signals an APS span switch failure. For a four-fiber
MS-SPRing, a failed span switch initiates a ring switch. If the ring switch occurs, the FAILTOSWS
condition does not appear. If the ring switch does not occur, the FAILTOSWS condition appears.
FAILTOSWS clears when one of the following situations occurs:
•
A physical card pull of the active TSC card done under Cisco TAC supervision.
• A node power cycle.
•
A higher-priority event such as an external switch command occurs.
• The next span switch succeeds.
•
The cause of the APS switch (such as the “MS-DEG” condition on page 2-98 or the “MS-EXC”
alarm on page 2-99 ) clears.
Clear the FAILTOSWS Condition
Step 1
Perform the EXERCISE SPAN command on the reporting card by completing the following steps:
a. Click the Maintenance > MS-SPRing tabs.
b.
Determine whether the card you would like to exercise is the west card or the east card.
c. Click the row of the affected span under the East Switch or West Switch column.
d.
Select Exercise Span in the drop-down list .
Step 2
If the condition does not clear, from the view menu, choose Go to Network View .
Step 3
Look for alarms on STM-N cards that make up the ring or span and troubleshoot these alarms.
Step 4 If clearing other alarms does not clear the FAILTOSWS condition, log into the near-end node.
Step 5
Click the Maintenance > MS-SPRing tabs.
Step 6 Record the STM-N cards listed under West Line and East Line. Ensure that these STM-N cards are active
and in service by completing the following steps:
a.
Verify the LED status: A green SRV LED indicates an active card.
b.
To determine whether the STM-N port is in service, double-click the card in CTC to display the card
view.
c.
Click the Provisioning > Line tabs.
d.
Verify that the Admin State column lists the port as Unlocked.
e.
If the Admin State column lists the port as Locked,maintenance or Locked,disabled, click the
column and choose
Unlocked . Click Apply .
Note
If ports managed into Unlocked administrative state are not receiving signals, the LOS alarm
is either raised or remains, and the port service state transitions to Unlocked-disabled,failed.
Step 7
If the STM-N cards are active and in service, verify fiber continuity to the ports on the recorded cards.
To verify fiber continuity, follow site practices.