Cisco ONS 15454 SDH Specifications Page 56

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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Alarm Procedures
The excess collisions on the LAN alarm indicates that too many collisions are occurring between data
packets on the network management LAN, and communications between the ONS 15454 SDH unit and
CTC may be affected. The network management LAN is the data network connecting the workstation
running the CTC software to the TCC-I card. This problem is external to the ONS 15454 SDH.
Procedure: Clear the EXCCOL Alarm
Troubleshoot the network management LAN connected to the TCC-I card for excess collisions. You may
need to contact the system administrator of the network management LAN to accomplish the following
steps.
Step 1 Verify that the network device port connected to the TCC-I card has a flow rate set to 10 MB,
half-duplex.
Step 2 Troubleshoot the network device connected to the TCC-I card and the network management LAN.
1.5.31 EXT
Minor, Non-service affecting
An external facility alarm is detected externally from the node because an environmental alarm is
present. For example, an open door or flooding can cause the alarm.
Procedure: Clear the EXT Alarm
Step 1 Open the ALM/PWR/MIC card maintenance screen to gather further information about this alarm.
Step 2 Perform your standard operating procedure for this environmental condition.
1.5.32 EXTRA-TRAF-PREEMPT
Major, Non-service affecting
An extra traffic preempted alarm is raised on STM-N cards because low-priority traffic directed to the
protect system has been preempted. This is caused by a working system protection switch.
Procedure: Clear the EXTRA-TRAF-PREEMPT Alarm
Step 1 Verify the protection switch has occurred by checking the ring map.
Step 2 Clear the problem on the working system.
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