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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 2 Alarm Troubleshooting
2.7.236 TIM
SONET Logical Object: OCN
The Section TIM alarm occurs when the expected J0 section trace string does not match the received
section trace string. This occurs because the data being received is not correct or the receiving port could
not connect to the correct transmitter port.
If the alarm occurs on a port that has been operating with no alarms, the circuit path has changed due to
a fibering misconnection, a TL1 routing change, or to someone entering an incorrect value in the Current
Transmit String field.
TIM occurs on a port that has previously been operating without alarms if someone switches optical
fibers that connect the ports. TIM is usually accompanied by other alarms, such as the “LOF (OCN)”
alarm on page 2-88 or the “UNEQ-P” alarm on page 2-142. If these alarms accompany a TIM alarm,
reattach or replace the original cables/fibers to clear the alarms. If a Transmit or Expected String was
changed, restore the original string.
Clear the TIM Alarm
Step 1 Ensure that the physical fibers are correctly configured and attached. To do this, consult site documents.
For more information about cabling the ONS 15310-CL or ONS 15310-MA, refer to the “Install
Hardware” chapter in the Cisco ONS 15310-CL and Cisco ONS 15310-MA Procedure Guide.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15310-CL
or ONS 15310-MA.
Step 2 If the alarm does not clear, you can compare the J0 expected and transmitted strings and, if necessary,
change them by completing the following steps:
a. Log into the circuit source node and click the Circuits tab.
b. Select the circuit reporting the condition, then click Edit.
c. In the Edit Circuit window, check the Show Detailed Circuit Map check box and click Apply.
d. On the detailed circuit map, right-click the source circuit port and choose Edit J0 Path Trace (port)
from the shortcut menu.
e. Compare the Current Transmit String and the Current Expected String entries in the Edit J0 Path
Trace dialog box.
f. If the strings differ, correct the Transmit or Expected strings and click Apply.
g. Click Close.
Step 3 If the alarm does not clear, ensure that the signal has not been incorrectly routed. (Although the
ONS 15310-CL or ONS 15310-MA routes circuits automatically, the circuit route could have been
changed using TL1.) If necessary, manually correct the routing using TL1. For instructions, refer to the
Cisco ONS SONET TL1 Reference Guide and the Cisco SONET TL1 Command Guide.
Step 4 If the alarm 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) in order to report a Service-Affecting (SA)
problem if necessary.