Cisco ONS 15454 - Clear the LOS (BITS) Alarm; 2.7.218 LOS (DS1); Clear the LOS (DS1) Alarm

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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 2 Alarm Troubleshooting
2.7.218 LOS (DS1)
Clear the LOS (BITS) Alarm
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
Plug the wristband cable into the ESD jack located on the lower-right edge of the shelf assembly.
Step 1 Verify the wiring connection from the BITS clock pin fields on the ONS 15454 backplane to the timing
source.
Step 2 If wiring is good, verify that the BITS clock is operating properly.
Step 3 If the alarm 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 in order to report a Service-Affecting (SA)
problem.
2.7.218 LOS (DS1)
Default Severity: Major (MJ), Service-Affecting (SA)
SONET Logical Object: DS1
A LOS (DS1) alarm for a DS-1 port occurs when the port on the card is in service but no signal is being
received. A cabling issue or a configuration issue could cause this alarm. If an upstream equipment
failure causes a transmission failure, the LOS (DS1) will likely be demoted by a card-level alarm (to the
DS1/E1-56).
Clear the LOS (DS1) Alarm
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
Plug the wristband cable into the ESD jack located on the lower-right edge of the shelf assembly.
Step 1 Verify that the fiber cable is properly connected and attached from the correct transmitting port to the
correct receiving port. For more information about fiber connections and terminations, refer to the
“Install Cards and Fiber-Optic Cable” chapter in the Cisco ONS 15454 Procedure Guide.
Step 2 Clean the cable ends using site practices or, if none exists, complete the procedure in the “Maintain the
Node” chapter of the Cisco ONS 15454 Procedure Guide.
Step 3 If the alarm is raised on a DS1/E1-56 card, verify that the card is placed in the correct service mode by
completing the following steps:
a. Double-click the card to open the card view.
b. Click the Provisioning > Card tabs.
c. Verify that the Operating Mode column says All DS1 for your errored circuit.
Step 4 For any other DS-1 or DS-3 card, consult site records to determine whether the port raising the alarm
has been assigned.
Step 5 If the port is not currently assigned, place the port out of service using the following steps:
a. Double-click the card to open the card view.