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Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
78-18663-01
Chapter 2 Alarm Troubleshooting
Alarm Procedures
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 “2.9.1 Protection Switching,
Lock Initiation, and Clearing” section on page 2-146 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 9 If no ports are shown bad and the alarm does not clear, log into the Technical Support Website at
http://www.cisco.com/cisco/web/support/index.html for more information or call Cisco TAC
(1-800-553-2447).
2.7.133 LOS (BITS)
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
SDH Logical Object: BITS
The LOS (BITS) alarm indicates that the ONS 15310-MA SDH has an LOS from the BITS timing
source. The LOS (BITS-N) means the BITS clock or the connection to it failed.
Clear the LOS (BITS) Alarm
Step 1 Verify the wiring connection from the BITS clock pin fields on the ONS 15310-MA SDH to the timing
source.
Caution Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15310-MA SDH.
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/cisco/web/support/index.html for more information or call Cisco TAC
(1-800-553-2447) in order to report a Service-Affecting (SA) problem.
2.7.134 LOS (E1)
Default Severity: Major (MJ), Service-Affecting (SA)
SDH Logical Object: E1
An LOS (E1) alarm for a E1 port on a E1-21/DS3-E3-3, or E1-63/DS3-E3-3 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.
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