2-32
Cisco ONS 15327 Troubleshooting Guide, R3.4
March 2004
Chapter 2 Alarm Troubleshooting
Alarm Procedures
Step 7 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).
2.6.32 CARLOSS (E Series)
• Major (MJ), Service Affecting (SA)
A Carrier Loss alarm on the LAN E-series Ethernet (traffic) card is the data equivalent of an LOS (OC-N)
alarm (see page 2-84). The Ethernet card has lost its link and is not receiving a valid signal. The most
common causes of the CARLOSS alarm are a disconnected cable or an improperly installed Ethernet
card. Ethernet card ports must be enabled (in service, IS) for CARLOSS to occur. CARLOSS is declared
after no signal is received for approximately 2.5 seconds.
The CARLOSS alarm also occurs after a node database is restored. After restoration, the alarm clears in
approximately 30 seconds after the node reestablishes Spanning Tree Protocol (STP). The database
restoration circumstance applies to the E-series Ethernet cards but not the G1000-2 card, because the
G1000-2 card does not use STP and is unaffected by STP reestablishment.
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.
Procedure: Clear the CARLOSS (E-Series) Alarm
Step 1 Verify that the straight-through (Category 5) LAN cable is properly connected and attached to the correct
port.
Step 2 If the straight-through (Category 5) LAN cable is properly connected and attached to the port, verify that
the cable connects the card to another Ethernet device and is not misconnected to an OC-N card.
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
straight-through (Category 5) LAN cable connecting the transmitting device to the Ethernet port.
Step 6 If a valid Ethernet signal is present, complete the “Remove and Reinsert (Reseat) a Card” procedure on
page 2-130 for the Ethernet (traffic) card.
Step 7 If the alarm does not clear, complete the “Physically Replace a Card” procedure on page 2-130 for the
Ethernet (traffic) card.
