Cisco ONS 15454 SDH Specifications Page 30

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1-6
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Safety Summary
1.3.2 Severities
The ONS 15454 SDH uses ITU-compliant severities: Critical (CR), Major (MJ), and Minor (MN).
Critical indicates a severe, service-affecting alarm that needs immediate correction. Major is still a
serious alarm, but the failure has less of an impact on the network.
Minor alarms, such as Fast Start Synchronization (FSTSYNC), do not have a serious affect on service.
FSTSYNC lets you know that the ONS 15454 SDH is choosing a new timing reference because the old
reference failed. The loss of the prior timing source is something a user needs to look at, but it should
not disrupt service.
The ONS 15454 SDH uses standard severity reporting that is ITU-compliant. A user may customize
ONS 15454 SDH alarm severities with the alarm profiles feature. For additional information about alarm
severities, refer to the Cisco ONS 15454 SDH Installation and Operations Guide. This chapter lists the
default alarm severity for the active reporting card, if applicable.
1.4 Safety Summary
This section covers safety considerations to ensure safe operation of the ONS 15454 system. Personnel
should not perform any procedures in this manual unless they understand all safety precautions,
practices, and warnings for the system equipment. Some troubleshooting procedures require installation
or removal of cards. In these instances, users should pay close attention to the following caution:
Caution Hazardous voltage or energy may be present on the backplane when the system is operating. Use caution
when removing or installing cards.
Some troubleshooting procedures require installation or removal of optical (STM) cards. In these
instances, users should pay close attention to the following warnings:
Warning
On the OC192 LR/STM64 LH 1550 card, the laser is on when the card is booted and the safety key is in
the on position (labeled 1). The port does not have to be in service for the laser to be on. The laser is
off when the safety key is off (labeled 0).
Warning
Invisible laser radiation may 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 may pose an eye hazard. Use of controls or adjustments or performance of procedures other than
those specified may result in hazardous radiation exposure.
Warning
Class 1 laser product.
Warning
Class 1M laser radiation when open. Do not view directly with optical instruments.
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