Cisco ONS 15310-MA Troubleshooting Manual page 122

Alarm Procedures
at the privileged EXEC mode of the Cisco IOS CLI. If you do not save the change, the change is lost
after the card reboots. If the command "copy run start" is executed in configuration mode and not
privileged EXEC mode, the running configuration will be saved, but the alarm will not clear.
2.7.189 SD
A Signal Degrade condition for a E1 or DS-3 signal on a 15310-MA SDH CTX, E1-21/DS3-E3-3, or
E1-63/DS3-E3-3 card occurs when the quality of an electrical signal has exceeded the BER signal
degrade threshold. Signal degrade is defined by Telcordia as a soft failure condition. SD and signal fail
(SF) both monitor the incoming BER and are similar conditions, but SD is triggered at a lower bit error
rate than SF.
The BER threshold is user-provisionable and has a range for SD from 1E–9 dBm to 1E–5 dBm.
SD can be reported on electrical ports that are unlocked-enabled; Out-of-Service and Autonomous,
Automatic In-Service (unlocked-disabled,AIS); or locked-enabled,maintenance, but not in the
Out-of-Service and Management, Disabled (locked-enabled; locked, disabled) service state. The BER
count increase associated with this alarm does not take an unlocked-enabled port out of service, but if it
occurs on an Automatic In Service port, the alarm prevents the port from going into service.
The SD condition clears when the BER level falls to one-tenth of the threshold level that triggered the
condition. A BER increase is sometimes caused by a physical fiber problem (including a faulty fiber
connection), a bend in the fiber that exceeds the permitted bend radius, or a bad fiber splice. SD can also
be caused by repeated 15310-MA-CTX card resets that in turn can cause switching on the lines or paths.
Invisible laser radiation could be emitted from the end of the unterminated fiber cable or connector.
Warning
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
Use of controls, adjustments, or performing procedures other than those specified could result in
Warning
hazardous radiation exposure. Statement 1057
Some levels of BER errors (such as 1E–9 dBm) take a long period of time to raise or clear, about
Note
9,000 seconds, or 150 minutes. If the SD threshold is provisioned at 1E–9 dBm rate, the SD alarm needs
at least one and one-half hours to raise and then another period at least as long to clear.
The recommended test set for use on all SDH ONS electrical ports is the Omniber 718.
Note
Clear the SD (E1, DS3) Condition
Step 1 Complete the
Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
2-122
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SDH Logical Objects: E1, DS3
"Clear a DS-3 or E1 Port Loopback Circuit" procedure on page
Chapter 2 Alarm Troubleshooting
2-155.
78-18663-01