Cisco ONS 15454 SDH Specifications Page 51

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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Alarm Procedures
1.5.25 ELWBATVG-B
Major, Service-affecting
The voltage on battery feed B is extremely low or has been lost, and power redundancy is no longer
guaranteed. The extreme low voltage battery A alarm occurs when the voltage on battery feed B drops
below -40.5 V DC. The alarm clears when voltage has remained above -40.5 V DC for 120 seconds.
Procedure: Clear the ELWBATVG-B Alarm
Step 1 The problem is external to the ONS 15454 SDH. Troubleshoot the power source for battery lead B.
1.5.26 EOC
Major, Non-service affecting
The termination failure SDCC alarm means the ONS 15454 SDH has lost the DCC. The DCC is three
bytes, D1 through D3, in the SDH overhead. The bytes convey information about Operation,
Administration, Maintenance, and Provisioning (OAM&P). The ONS 15454 SDH uses the DCC on the
SDCC to communicate network management information.
Warning
The ONS 15454 SDH is a Class I (CDRH) and Class 1M (IEC) laser system.
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 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.
Caution Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15454 SDH. Plug the wristband cable into the ESD jack located on the middle-right outside edge
of the shelf assembly.
Procedure: Clear the EOC Alarm
Step 1 If an LOS alarm is also reported, perform the “Clear the LOS Alarm on an STM-N Card” procedure on
page 1-41.
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