Cisco ONS 15454 SDH Specifications Page 41

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1-17
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Alarm Procedures
e. Close the ejectors.
Note When replacing a card with an identical type of card, you do not need to change the CTC
database.
1.5.13 CARLOSS (E-Series)
Major, Service-affecting
A carrier loss on the LAN alarm is the data equivalent of an SDH LOS alarm. The Ethernet card has lost
its link and is not receiving a valid signal. The most common causes of this alarm are a disconnected
cable or an improperly installed Ethernet card. Ethernet card ports must be enabled (put in service) for
CARLOSS to occur. CARLOSS is declared after no signal is received for approximately 2.5 seconds.
This alarm also occurs after the restoration of a node database. In this instance, the alarm will clear in
approximately 30 seconds after spanning-tree protection reestablishes. This applies to the E-series
Ethernet cards, but not to the G1000-4 card. The G1000-4 card does not use spanning tree protocol (STP)
and is unaffected by STP reestablishment.
Caution Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15454 SDH. Plug the wristband cable into the ESD jack located on the middle-right outside edge
of the shelf assembly.
Procedure: Clear the CARLOSS Alarm (E Series)
Step 1 Verify that the Ethernet cable is properly connected and attached to the correct port.
Step 2 Verify that the Ethernet cable connects the card to another Ethernet device and is not misconnected to
an STM-N card.
Step 3 Check that the transmitting device is operational. If not, troubleshoot the device.
Step 4 Using a test set, determine that a valid signal is coming into the Ethernet port.
Step 5 If a valid Ethernet signal is not present and the transmitting device is operational, replace the Ethernet
cable connecting the transmitting device to the Ethernet port.
Step 6 If a valid Ethernet signal is present, physically reseat the Ethernet card.
Step 7 If the alarm does not clear, replace the Ethernet card:
a. Open the card ejectors.
b. Slide the card out of the slot.
c. Open the ejectors on the replacement card.
d. Slide the replacement card into the slot along the guide rails.
e. Close the ejectors.
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