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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 2 Alarm Troubleshooting
2.7.187 LCAS-RX-DNU
The Link Capacity Adjustment Scheme (LCAS) Control Word CRC Failure condition is raised against
ML-Series Ethernet and CE-series cards. It occurs when there is an equipment, path, or provisioning
error on the virtual concatenation group (VCG) that causes consecutive 2.5 second CRC failures in the
LCAS control word.
Transmission errors would be reflected in CV-P, ES-P, or SES-P performance monitoring statistics. If
these errors do not exist, an equipment failure is indicated.
If LCAS is not supported on the peer node, the condition does not clear.
LCAS-CRC can also occur if the VCG source node is not LCAS-enabled, but the receiving node does
have the capability enabled. Both source and destination nodes must have LCAS enabled. Otherwise, the
LCAS-CRC condition persists on the VCG.
Note For more information about the ML-Series Ethernet cards, refer to the Cisco ONS 15454 and
Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide.
Clear the LCAS-CRC Condition
Step 1 Look for and clear any associated equipment failures, such as the EQPT alarm, on the receive node or
transmit node.
Step 2 Look for and clear any bit error rate alarms at the transmit node.
Step 3 If no equipment or SONET path errors exist, ensure that the remote node has LCAS enabled on the
circuit:
a. In node view, click the Circuits tab.
b. Choose the VCAT circuit and click Edit.
c. In the Edit Circuit window, click the General tab.
d. Verify that the Mode column says LCAS.
Step 4 If the column does not say LCAS, complete the “Delete a Circuit” procedure on page 2-275 and recreate
it in LCAS mode using the instructions in the Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet
Card Software Feature and Configuration Guide.
Step 5 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.
2.7.187 LCAS-RX-DNU
Default Severity: Major (MJ), Service-Affecting (SA)
SONET Logical Objects: STSTRM, VT-TERM
The LCAS VCG Member Receive-Side-In Do Not Use condition is raised on CE-MR-10 cards and
ML-MR-10 Ethernet cards when the receive side of an LCAS VCG member is in the do-not use state.
For a unidirectional failure, this condition is only raised at the source node.
The node reporting this condition likely reports an “RFI-P” alarm on page 2-205 and “RFI-V” alarm on
page 2-205 for CE-MR-10, and “RFI-P” alarm on page 2-205 for ML-MR-10.
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