Cisco ONS 15310-MA Troubleshooting Manual page 93

Chapter 2 Alarm Troubleshooting
Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
Caution
perform an external switch if a switch has not already occurred. See the
Lock Initiation, and Clearing" section on page 2-146
Note
If no ports are shown bad and the alarm does not clear, log into the Technical Support Website at
Step 9
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)
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
Verify the wiring connection from the BITS clock pin fields on the ONS 15310-MA SDH to the timing
Step 1
source.
Always use the supplied electrostatic discharge wristband when working with a powered
Caution
ONS 15310-MA SDH.
If wiring is good, verify that the BITS clock is operating properly.
Step 2
If the alarm does not clear, log into the Technical Support Website at
Step 3
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)
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.
78-18663-01
When you replace a card with the identical type of card, you do not need to make any changes
to the database.
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
SDH Logical Object: BITS
Default Severity: Major (MJ), Service-Affecting (SA)
SDH Logical Object: E1
for commonly used traffic-switching procedures.
Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
Alarm Procedures
"2.9.1 Protection Switching,
2-93