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Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
78-18663-01
Chapter 2 Alarm Troubleshooting
Alarm Procedures
Step 10 If the TPTFAIL alarm was not raised, determine whether a terminal (inward) loopback has been
provisioned on the port by completing the following steps:
a. In node view, click the card to go to card view.
b. Click the Maintenance > Loopback tabs.
c. If the service state is listed as locked, enabled; loopback; locked, maintenance, a loopback is
provisioned. Go to Step 11.
Step 11 If a loopback was provisioned, complete the “Clear an Ethernet Card Loopback Circuit” procedure on
page 2-156.
On the CE-100T-8, provisioning a terminal (inward) loopback causes the transmit laser to turn off. If an
attached Ethernet device detects the loopback as a loss of carrier, the attached Ethernet device shuts off
the transmit laser to the CE-100T-8 card. Terminating the transmit laser could raise the CARLOSS alarm
because the loopbacked CE-100T-8 port detects the termination. For more information about CE-100T-8
cards, refer to the Cisco ONS 15310-CL and Cisco ONS 15310-MA Ethernet Card Software Feature and
Configuration Guide.
If the port or card does not have a loopback condition, continue with Step 12.
Step 12 If a CARLOSS alarm repeatedly appears and clears, the reappearing alarm could be a result of
mismatched VC circuit sizes in the setup of the manual cross-connect. Perform the following steps if the
Ethernet circuit is part of a manual cross-connect by completing the following steps:
Note An Ethernet manual cross-connect is used when another vendor’s equipment sits between
ONS nodes, and the Open System Interconnection/Target Identifier Address Resolution Protocol
(OSI/TARP)-based equipment does not allow tunneling of the TCP/IP-based DCC. To
circumvent a lack of continuous DCC, the Ethernet circuit is manually cross connected to a VC
channel riding through the non-ONS network.
a. Right-click anywhere in the row of the CARLOSS alarm.
b. Right-click or left-click Select Affected Circuits in the shortcut menu that appears.
c. Record the information in the type and size columns of the highlighted circuit.
d. Examine the layout of your network and determine which node and card are hosting the Ethernet
circuit at the other end of the Ethernet manual cross-connect using the following substeps:
• Log into the node at the other end of the Ethernet manual cross-connect.
• Double-click the Ethernet card that is part of the Ethernet manual cross-connect.
• Click the Circuits tab.
• Record the information in the type and size columns of the circuit that is part of the Ethernet
manual cross-connect. The cross-connect circuit connects the Ethernet port to an STM-N port
at the same node.
e. Determine whether the two Ethernet circuits on each side of the Ethernet manual cross-connect have
the same circuit size from the circuit size information you recorded.
f. If one of the circuit sizes is incorrect, complete the “Delete a Circuit” procedure on page 2-154 and
reconfigure the circuit with the correct circuit size. Refer to the “Create Circuits” chapter in the
Cisco ONS15310-MA SDH Procedure Guide for detailed procedures to do this.
Step 13 If a valid Ethernet signal is present, complete the “Remove and Reinsert (Reseat) a Card” procedure on
page 2-153.
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