Cisco ONS 15454 Troubleshooting Manual page 357

Chapter 2 Alarm Troubleshooting
c.
d.
e.
If the correct port is in service, use an optical test set to confirm that a valid signal exists on the line. For
Step 4
specific procedures to use the test set equipment, consult the manufacturer. Test the line as close to the
receiving card as possible.
Step 5 If the signal is valid, ensure that the transmit and receive outputs from the patch panel to your equipment
are properly connected. For more information about fiber connections and terminations, refer to the
"Install Cards and Fiber-Optic Cable" chapter in the Cisco ONS 15454 Procedure Guide.
If a valid signal exists but the alarm does not clear, replace the cable connector on the ONS 15454.
Step 6
Repeat Steps
Step 7
If the alarm does not clear, the cabling could still be faulty despite correct attachments. Use the test set
Step 8
to locate the bad cable and replace it using the "Install Cards and Fiber-Optic Cable" chapter in the
Cisco ONS 15454 Procedure Guide.
If the alarm does not clear, look for any card-level alarm that could cause this port alarm.
Step 9
Step 10 If the alarm does not clear, complete the
for the reporting card.
If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
Step 11
for more information or call Cisco TAC 1 800 553-2447 in order to report a Service-Affecting (SA)
problem.
2.7.222 LOS (ESCON)
For information about this alarm or condition, refer to the "Alarm Troubleshooting" chapter in the
Cisco ONS 15454 DWDM Troubleshooting Guide. This guide discusses all DWDM alarms.
2.7.223 LOS (FUDC)
The LOS (FUDC) alarm is raised if there is a UDC circuit created on an AIC-I UDC port but the port is
not receiving signal input. The downstream node has an AIS condition raised against the AIC-I port
transmitting the UDC. FUDC refers to the 64-kb user data channel using the F1 byte.
Clear the LOS (FUDC) Alarm
Verify cable continuity to the AIC-I UDC port. To verify cable continuity, follow site practices.
Step 1
November 2009
Click the Provisioning > 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.
Note If ports managed into IS admin state are not receiving signals, the LOS alarm is either raised
or remains, and the port service state transitions to OOS-AU,FLT.
2 through 6 for any other port on the card that reports the LOS (EC1).
Default Severity: Minor (MN), Non-Service Affecting (NSA)
SONET Logical Object: FUDC
"Physically Replace a Traffic Card" procedure on page 2-273
Cisco ONS 15454 Troubleshooting Guide, R8.5
2.7.222 LOS (ESCON)
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