Los (Ds1); Clear The Los (Ds1) Alarm - Cisco ONS 15310-CL Troubleshooting Manual

Chapter 1 Alarm Troubleshooting
Step 2 If wiring is good, verify that the BITS clock is operating properly.
If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
Step 3
for more information or call Cisco TAC (1 800 553-2447) in order to report a Service-Affecting (SA)
problem.

1.7.146 LOS (DS1)

An LOS (DS1) alarm for a DS-1 port on a 15310-CL-CTX, DS1-28/DS3-EC1-3, or DS1-84/DS3-EC1-3
card occurs when the port on the port is in service but no signal is being received. The cabling might not
be correctly connected to the port, or the line could have no signal.
Note When the ONS 15310-MA raises an LOF (DS1) or LOS (DS1) alarm, a path protection switch will
occur, but a PDI-P alarm will not be generated due to hardware limitations.

Clear the LOS (DS1) Alarm

Step 1 Verify that the cable is properly connected and attached to the correct port. For more information about
cable connections and terminations, refer to the "Install Hardware" chapter in the Cisco ONS 15310-CL
and Cisco ONS 15310-MA Procedure Guide.
Always use the supplied electrostatic discharge wristband when working with a powered ONS 15310-CL
Caution
or ONS 15310-MA.
Consult site records to determine whether the port raising the alarm has been assigned.
Step 2
If the port is not currently assigned, place the port out of service using the following steps:
Step 3
a.
b.
c.
d.
If the port is assigned, verify that the correct port is in service by completing the following steps:
Step 4
a.
b.
78-17235-01
Default Severity: Major (MJ), Service-Affecting (SA)
SONET Logical Object: DS1
In node view, double-click the DS-1 card (15310-CL-CTX, DS1-28/DS3-EC1-3, or
DS1-84/DS3-EC1-3) to display the card view.
Click the Maintenance > DS1 tabs.
In the Admin State column, click OOS,DSBLD.
Click Apply.
To confirm this physically, confirm that the green ACT LED is on.
To determine this virtually, double-click the card in CTC to display the card view and complete the
following substeps:
Click the Provisioning > DS1> Line tabs.
•
Verify that the Admin State column lists the port as IS.
•
If the Admin State column lists the port as OOS,MT or OOS,DSBLD, click the column and
•
choose IS. Click Apply.
Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
1.7.146 LOS (DS1)
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