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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 2 Alarm Troubleshooting
2.7.362 SD-V
An SD Path condition is similar to the “SD (DS1, DS3)” condition on page 2-217, but it applies to the
path (STS) layer of the SONET overhead. A path or STS-level SD alarm travels on the B3 byte of the
SONET overhead.
For path protection protected circuits, the BER threshold is user-provisionable and has a range for SD
from 1E–9 dBm to 1E–5 dBm. For BLSR 1+1 and unprotected circuits, the BER threshold value is not
user-provisionable and the error rate is hard-coded to 1E–6 dBm.
On path protection configurations, an SD-P condition causes a switch from the working card to the
protect card at the path (STS) level. On BLSR, 1+1, and on unprotected circuits, an SD-P condition does
not cause switching.
The BER increase that causes the condition is sometimes caused by a physical fiber problem such as a
poor fiber connection, a bend in the fiber that exceeds the permitted bend radius, or a bad fiber splice.
The SD clears when the BER level falls to one-tenth of the threshold level that triggered the alarm.
Clear the SD-P Condition
Step 1 Complete the “Clear the SD (DS1, DS3) Condition” procedure on page 2-218.
Step 2 If the condition 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.
2.7.362 SD-V
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: VT-MON, VT-TERM
An SD-V condition is similar to the “SD (DS1, DS3)” condition on page 2-217, but it applies to the VT
layer of the SONET overhead.
For path protection protected circuits, the BER threshold is user-provisionable and has a range for SD
from 1E–9 dBm to 1E–5 dBm. For BLSR 1+1 and unprotected circuits, the BER threshold value is not
user-provisionable and the error rate is hard-coded to 1E–6 dBm.
On path protection configurations, an SD-V condition does not cause a switch from the working card to
the protect card at the path (STS) level. On BLSR, 1+1, and on unprotected circuits, an SD-V condition
does not cause switching.
The BER increase that causes the alarm is sometimes caused by a physical fiber problem such as a poor
fiber connection, a bend in the fiber that exceeds the permitted bend radius, or a bad fiber splice.
The SD alarm clears when the BER level falls to one-tenth of the threshold level that triggered the alarm.
Clear the SD-V Condition
Step 1 Complete the “Clear the SD (DS1, DS3) Condition” procedure on page 2-218.
Step 2 If the condition 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.
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