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Cisco ONS 15327 Troubleshooting Guide, R3.4
March 2004
Chapter 2 Alarm Troubleshooting
Alarm Procedures
For specific procedures to use the test set equipment, consult the manufacturer. Test the line as close to
the receiving card as possible.
Step 4 If the signal is valid, ensure that the transmit and receive outputs from the DSx panel to your equipment
are properly connected.
Step 5 If a valid signal exists, replace the DS-N connector on the MIC card.
Step 6 Repeat Steps 1 through 5 for any other port on the card that reports the LOS.
Step 7 If the alarm does not clear, look for and troubleshoot any other alarm that might identify the source of
the problem.
Step 8 If no other alarms are present that might be the source of the LOS, or if clearing an alarm did not clear
the LOS, complete the “Physically Replace a Card” procedure on page 2-130 for the reporting card.
Note When replacing a card with an identical type of card, no additional CTC provisioning is
required.
Step 9 If the alarm does not clear, log onto http://www.cisco.com/tac for more information or call TAC to report
a service-affecting problem (1-800-553-2447).
2.6.112 LOS (DS-3)
• Critical (CR), Service Affecting (SA)
The DS-3 LOS alarm for either an XTC DS-3 port or DS-1 port occurs when the port on the card is in
service but no signal is being received. The cabling is not correctly connected to the card, or no signal
exists on the line. Possible causes for no signal on the line include upstream equipment failure or a fiber
cut.
Warning
Invisible laser radiation might be emitted from the end of the unterminated fiber cable or connector.
Do not stare into the beam directly with optical instruments. Viewing the laser output with certain
optical instruments (for example, eye loupes, magnifiers, and microscopes) within a distance of 100
mm might pose an eye hazard. Use of controls or adjustments or performance of procedures other than
those specified might result in hazardous radiation exposure.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15327.
Plug the wristband cable into the ESD jack located between the top high-speed and XTC slots.
Note If a circuit shows an incomplete state when this alarm is raised, the logical circuit is in place and will be
able to carry traffic when the connection issue is resolved. You do not need to delete the circuit when
troubleshooting this alarm.
Procedure: Clear the LOS (DS-3) Alarm
Step 1 Verify cabling continuity to the port.