Specifications

1-16
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 1 Alarm Troubleshooting
A carrier loss on the LAN is the data equivalent of an optical LOS. The Ethernet card has lost its link
and is not receiving any signal, even an invalid one. The most common causes of this alarm are a
disconnected cable or an improperly installed Ethernet card.
CARLOSS also occurs after the restoration of a node’s database. In this instance, the alarm will clear in
approximately 30 seconds after spanning tree protection reestablishes.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
Plug the wristband cable into the ESD jack located on the lower-right outside edge of the shelf
assembly.
Procedure: Clear the CARLOSS Alarm
Step 1 Verify that the cable is properly connected and attached to the correct port.
Step 2 Check that the transmitting device is operational. If not, troubleshoot the device.
Step 3 Using a test set, determine that a valid signal is coming into the Ethernet port.
Step 4 If a valid Ethernet signal is not present and the transmitting device is operational, check that the Ethernet
wiring is intact and correct.
Step 5 If a valid Ethernet signal is present, physically reseat the Ethernet card.
Step 6 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.
Note When replacing a card with an identical type of card, you do not need to change the CTC
database.
1.3.24 CONCAT
• Critical, Service affecting
The STS Concatenation error alarm occurs when the transmitted STSc circuit is smaller than the
provisioned STSc, which causes a mismatch of the circuit type on the concatenation facility. For
example, an STS3c or STS1 is sent across a circuit provisioned for STS12c.
Either an incorrect circuit size was provisioned on the reporting node, or the circuit source is delivering
the wrong circuit size. If a recently-configured circuit reports this alarm, it is more likely that the
provisioned circuit size is incorrect. If a previously configured circuit has been operating correctly for a
period and then reports the alarm, it is more likely that a problem occurred with the circuit source.