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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 2 Alarm Troubleshooting
2.7.381 SQUELCHED
d. Verify that the Admin State column lists the port as IS.
e. If the Admin State column lists the port as OOS,MT or OOS,DSBLD, click the column and choose
IS. Click Apply.
Note If ports managed into IS admin state are not receiving signals, the LOS alarm is either raised
or remains, and the port service state transitions to OOS-AU,FLT.
Step 4 If the correct ports are in service, use an optical test set to verify that a valid signal exists on the line.
For specific procedures to use the test set equipment, consult the manufacturer. Test the line as close to
the receiving card as possible.
Step 5 If the signal is valid, verify that the power level of the optical signal is within the optical card receiver
specifications. Refer to the Cisco ONS 15454 Reference Manual for card specifications.
Step 6 If the receiver levels are good, ensure that the optical transmit and receive fibers are connected properly.
Step 7 If the connectors are good, complete the “Physically Replace a Traffic Card” procedure on page 2-273
for the OC-N card.
Step 8 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.
2.7.381 SQUELCHED
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: OCN
DWDM Logical Objects: 2R, ESCON, FC, GE, ISC, TRUNK
The Client Signal Squelched condition is raised by a TXP_MR_10G, TXP_MR_10E, TXP_MR_2.5G,
TXPP_MR_2.5G, MXP_2.5G_10G, MXP_2.5G_10E, MXP_MR_2.5G, or MXPP_MR_2.5G card.
The condition can be raised in the following situations:
• An MXP or TXP client facility detects that an upstream receive facility has experienced a loss of
signal (such as an Ethernet CARLOSS, DWDM SIGLOSS, or optical LOS). In response, the
facility’s transmit is turned off (SQUELCHED). The upstream receive facilities are the trunk receive
on the same card as the client, as well as the client receive on the card at the other end of the trunk
span.
• The client will squelch if the upstream trunk receive (on the same card) experiences the “SIGLOSS”
alarm on page 2-226, the “CARLOSS (FC)” alarm on page 2-62, the “CARLOSS (GE)” alarm on
page 2-65, the “CARLOSS (ISC)” alarm on page 2-65, the “LOS (2R)” alarm on page 2-157, the
“LOS (ESCON)” alarm on page 2-163, the “LOS (ISC)” alarm on page 2-164, or the “LOS
(TRUNK)” alarm on page 2-166. In some transparent modes, the client is squelched if the trunk
detects the “AIS” alarm on page 2-36 or the “TIM” alarm on page 2-244.
• The client will squelch if the upstream client receive (on the card at the other end of the DWDM
span) experiences the “SIGLOSS” alarm on page 2-226, the “CARLOSS (FC)” alarm on page 2-62,
the “CARLOSS (GE)” alarm on page 2-65, the “CARLOSS (ISC)” alarm on page 2-65, the “LOS
(2R)” alarm on page 2-157, the “LOS (ESCON)” alarm on page 2-163, the “LOS (ISC)” alarm on
page 2-164, or the “LOS (TRUNK)” alarm on page 2-166.
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