2-54
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 2 Alarm Troubleshooting
2.6.58 FAILTOSWR
Step 6
Record the STM-N cards listed under West Line and East Line. Ensure that these STM-N cards and ports
are active and in service by completing the following steps:
a.
Verify the LED status: a green SRV LED indicates an active card.
b.
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.
Step 8
If fiber continuity to the ports is good, use an optical test set to verify that a valid signal exists on the
line. For specific procedures to use the test set equipment, consult the manufacturer. Test the line as close
to the receiving card as possible.
Caution
Using an optical test set disrupts service on the STM-N card. It could be necessary to manually switch
traffic carrying circuits over to a protection path. Refer to the
“2.8.2 Protection Switching, Lock
Initiation, and Clearing” section on page 2-123
for commonly used switching procedures.
Step 9
If the signal is valid, clean the fiber according to site practice. If no site practice exists, complete the
procedure in the “Maintain the Node” chapter in the
Cisco ONS 15600 SDH Procedure Guide
.
Step 10
If cleaning the fiber does not clear the condition, verify that the power level of the optical signal is within
the STM-N card receiver specifications. The
“1.9.3 Optical Traffic Card Transmit and Receive Levels”
lists these specifications.
Step 11
Repeat Steps
through
for any other ports on the card.
Step 12
If the optical power level for all STM-N cards is within specifications, complete the
for the protect standby STM-N card.
Caution
Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
perform an external switch if a switch has not already occurred. See the
Lock Initiation, and Clearing” section on page 2-123
for commonly used traffic-switching procedures.
Note
When you replace a card with the identical type of card, you do not need to make any changes
to the database.
Step 13
If the condition does not clear after you replace the MS-SPRing cards on the node one by one, repeat
Steps
through
for each of the nodes in the ring.
Step 14
If the condition does not clear, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call Cisco TAC (1 800 553-2447).
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