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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter2 Alarm Troubleshooting
2.7.153 LPBKDS3FEAC
The Cross-Connect Loopback condition indicates that there is a software cross-connect loopback active
between two OC-3 or OC-12 optical ports. A cross-connect loopback test occurs below line speed and
does not affect traffic.
For more information on loopbacks, see the “1.2 Identify Points of Failure on an Electrical Circuit Path”
section on page 1-3.
Note Cross-connect loopbacks occur below line speed. They do not affect traffic.

Clear the LPBKCRS Condition

Step1 To remove the cross-connect loopback condition, double-click the 15310-CL-CTX or CTX2500 card in
CTC to display the card view.
Step2 Complete the “Clear an OC-N Port XC Loopback Circuit” procedure on page2-156.
Step3 If the condition does not clear, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call CiscoTAC (1-800-553-2447).
2.7.153 LPBKDS3FEAC
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: DS3
A Loopback Due to FEAC Command DS-3 condition occurs when a DS-3 port loopback signal is
received on a 15310-CL-CTX, DS1-28/DS3-EC1-3, or DS1-84/DS3-EC1-3 card in C-bit line type mode
from the far-end node because of a FEAC command. An FEAC command is often used with loopbacks.
LPBKDS3FEAC is only reported by these DS-3 ports.
Caution CTC permits loopbacks on an in-service (IS) circuit. Loopbacks are Service-Affecting(SA).

Clear the LPBKDS3FEAC Condition

Step1 In node view, double-click the DS-3 card (15310-CL-CTX, DS1-28/DS3-EC1-3, or
DS1-84/DS3-EC1-3) to display the card view.
Step2 Click the Provisioning > DS3 > Line tabs.
Step3 Click the cell for the port in the Send Code column and click No Code from the drop-down list.
Step4 If the condition does not clear, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call CiscoTAC (1-800-553-2447).
2.7.154 LPBKDS3FEAC-CMD
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)