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Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
78-18663-01
Chapter 2 Alarm Troubleshooting
Alarm Procedures
The SDH DCC Termination Failure alarm occurs when the ONS 15310-MA SDH loses its DCC. The
regenerator-section data communication channel (RS-DCC) overhead consists of three bytes, D1
through D3, in the SDH overhead. The bytes convey information about Operation, Administration,
Maintenance, and Provisioning (OAM&P). The node uses the DCC on the SDH section layer to
communicate network management information.
Warning
Invisible laser radiation could 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 could pose an eye hazard.
Statement 1056
Warning
Use of controls, adjustments, or performing procedures other than those specified could result in
hazardous radiation exposure.
Statement 1057
Note If a circuit shows a partial state when this alarm is raised, the logical circuit is in place. The circuit is
able to carry traffic when the connection issue is resolved. You do not need to delete the circuit when
troubleshooting this alarm.
Clear the EOC Alarm
Step 1 If the “LOS (STM)” alarm on page 2-98 is also reported, complete the “Clear the LOS (STM) Alarm”
procedure on page 2-98.
Step 2 If the “MS-EXC” condition on page 2-126 is reported, complete the “Clear the MS-EXC Condition”
procedure on page 2-126.
Step 3 If the alarm does not clear on the reporting node, ensure that the physical connections between the ports
and that the fiber-optic cables are configured to carry RS-DCC traffic. If they are not, correct them. For
more information about fiber connections and terminations, refer to the “Install Hardware” chapter in
the Cisco ONS15310-MA SDH Procedure Guide.
Caution Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15310-MA SDH.
If the physical connections are correct and configured to carry DCC traffic, verify that both ends of the
fiber span have unlocked-enabled ports. Verify that the ACT LED is green.
Step 4 When the LED on the controller card (ONS 15310-MA SDH) is green, complete the “Verify or Create
Node DCC Terminations” procedure on page 2-154 to ensure that the DCC is provisioned for the ports
at both ends of the fiber span.
Step 5 Repeat Step 4 at the adjacent nodes.
Step 6 If DCC is provisioned for the ends of the span, verify that the port is active and in service by completing
the following steps:
a. In node view, double-click the ONS 15310-MA SDH to display the card view.
b. Click the Provisioning > Optical > Line tabs.
c. Confirm that the STM1, STM4, or STM16 port shows a green LED.
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