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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 2 Alarm Troubleshooting
2.7.51 CARLOSS (E1000F, E100T)
Step 3 If no misconnection to an OC-N card exists, verify that the transmitting device is operational. If not,
troubleshoot the device.
Step 4 If the alarm does not clear, use an Ethernet test set to determine whether a valid signal is coming into
the Ethernet port. For specific procedures to use the test set equipment, consult the manufacturer.
Step 5 If a valid Ethernet signal is not present and the transmitting device is operational, replace the fiber cable
connecting the transmitting device to the Ethernet port. To do this, refer to the “Install Cards and
Fiber-Optic Cable” chapter in the Cisco ONS 15454 Procedure Guide.
Step 6 If a valid Ethernet signal is present, complete the “Remove and Reinsert (Reseat) Any Card” procedure
on page 2-273 for the Ethernet card.
Step 7 If the alarm does not clear, complete the “Physically Replace a Traffic Card” procedure on page 2-273
for the Ethernet card.
Step 8 If a CARLOSS alarm repeatedly appears and clears, use the following steps to examine the layout of
your network to determine whether the Ethernet circuit is part of an Ethernet manual cross-connect.
An Ethernet manual cross-connect is used when another vendor’s equipment sits between ONS 15454
nodes, and the open systems interconnect/target identifier address resolution protocol
(OSI/TARP)-based equipment does not allow tunneling of the ONS 15454 TCP/IP-based DCC. To
circumvent a lack of continuous DCC, the Ethernet circuit is manually cross connected to an STS
channel riding through the non-ONS network.
If the reporting Ethernet circuit is part of an Ethernet manual cross-connect, complete the following
steps. The reappearing alarm could be a result of mismatched STS circuit sizes in the set up of the manual
cross-connect. If the Ethernet circuit is not part of a manual cross-connect, the following steps do not
apply.
a. Right-click anywhere in the row of the CARLOSS alarm.
b. 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. From the examination of the layout of your network, determine which ONS 15454 and card and card
are hosting the Ethernet circuit at the other end of the Ethernet manual cross-connect and complete
the following substeps:
• Log into the ONS 15454 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 Ethernet manual cross-connect circuit connects the Ethernet card to
an OC-N card at the same node.
e. Use the information you recorded to determine whether the two Ethernet circuits on each side of the
Ethernet manual cross-connect have the same circuit size.
If one of the circuit sizes is incorrect, complete the “Delete a Circuit” procedure on page 2-275 and
reconfigure the circuit with the correct circuit size. For more information, refer to the “Create
Circuits and VT Tunnels” chapter in the Cisco ONS 15454 Procedure Guide.
Step 9 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.
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