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Cisco ONS 15327 Troubleshooting Guide, R3.4
March 2004
Chapter 2 Alarm Troubleshooting
Alarm Procedures
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15327.
Plug the wristband cable into the ESD jack located between the top high-speed and XTC slots.
Note If a circuit shows an incomplete state when this alarm is raised, the logical circuit is in place and will be
able to carry traffic when the connection issue is resolved. You do not need to delete the circuit when
troubleshooting this alarm.
Procedure: Clear the LOS (OC-N) Alarm
Step 1 Verify fiber continuity to the port.
Step 2 If the cabling is correct, verify that the correct port is in service.
a. Confirm that the OC-N card shows a green LED in CTC or on the physical card:
A green LED indicates an active card. An amber LED indicates a standby card.
b. To determine whether the OC-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 State column lists the port as in service (IS).
e. If the State column lists the port as OOS, click the column and choose IS. Click Apply.
Step 3 If the correct port is in service, clean the fiber connectors according to site practice. If no site practice
exists, complete the procedure in the Cisco ONS 15327 Procedure Guide.
Step 4 If the alarm does not clear, verify that the power level of the optical signal is within the OC-N card’s
receiver specifications. The “Optical Card Transmit and Receive Levels” section on page 1-77 lists these
specifications for each card.
Step 5 If optical power level is within specifications, 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.
Step 6 Repeat Steps 1 through 5 for any other port on the card reporting the alarm.
Step 7 If the alarm does not clear, look for and troubleshoot any other alarm that might identify the source of
the problem.
Step 8 If no other alarms exist that might be the source of the LOS, or if clearing an alarm did not clear the LOS
(OC-N), complete the “Physically Replace a Card” procedure on page 2-130 for the reporting card.
Note When replacing a card with an identical type of card, no additional CTC provisioning is
required.
Step 9 If the alarm does not clear, log onto http://www.cisco.com/tac for more information or call TAC to report
a service-affecting problem (1-800-553-2447).