Cisco ONS 15454 Troubleshooting Manual page 355

Chapter 2 Alarm Troubleshooting
Step 10 If the test set shows signal errors but the cabling is correctly installed and the transmitting device is
operational, the existing cabling could still be faulty. Use the test set to locate the bad cable and replace
it. To do this, refer to the "Install Cards and Fiber-Optic Cable" chapter in the Cisco ONS 15454
Procedure Guide.
Step 11 Repeat Steps
If the alarm does not clear, complete the
Step 12
for the reporting card.
Step 13 If the alarm 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 in order to report a Service-Affecting (SA)
problem.
2.7.220 LOS (E1)
An LOS (E1) alarm for a DS1/E1-56 card port occurs when the card is placed in All E1 mode and is in
service, but the alarmed port is not receiving a signal due to a physical or provisioning problem. The
physical causes for the alarm could be incorrectly connected or faulty cabling. The software causes could
be improperly configured card or circuit size.
For more information about the DS1/E1-56 card, refer to the "Electrical Cards" chapter in the
Cisco ONS 15454 Reference Manual.
Clear the LOS (E1) Alarm
Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
Caution
Plug the wristband cable into the ESD jack located on the lower-right edge of the shelf assembly.
Verify that the cable is properly connected and attached to the correct port. For more information about
Step 1
connecting cable, refer to the "Install Cards and Fiber-Optic Cable" chapter in the Cisco ONS 15454
Procedure Guide. Also refer to site records for your specific cabling scheme.
Step 2 Ensure that the transmit and receive outputs from the patch panel to your equipment are properly
connected. For more information about cable connections and terminations, refer to the "Install Cards
and Fiber-Optic Cable" chapter in the Cisco ONS 15454 Procedure Guide.
Clean the cable using your site practices. If none exists, complete the procedure in the "Maintain the
Step 3
Node" chapter in the Cisco ONS 15454 Procedure Guide.
Confirm that the card is properly provisioned to carry the E1 payload:
Step 4
a.
b.
c.
November 2009
1 to 10 for any other port on the card that reports the LOS.
Default Severity: Major (MJ), Service-Affecting (SA)
SONET Logical Object: E1
Double-click the card to open the card view.
Click the Provisioning > Card tabs.
Under the Operating Mode column, you should see "All E1." If you see "All DS1," click the
drop-down to change it and click Apply.
"Physically Replace a Traffic Card" procedure on page 2-273
Cisco ONS 15454 Troubleshooting Guide, R8.5
2.7.220 LOS (E1)
2-161