Cisco ONS 15454 SDH Especificaciones Pagina 36

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1-12
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Alarm Procedures
Step 2 On the card raising the alarm, check whether attenuation is present on the input fiber cable.
Step 3 Check signal level on the input fiber with the attenuator (if present).
Step 4 If fiber signal level with attenuator is below the correct threshold, remove the attenuator and check signal
level again.
Step 5 If the signal level is still low, clean both ends of the fiber cable connection:
a. Clean the fiber cable ends according to local site practice.
b. If no local practice exists, use a CLETOP Real-Type or equivalent fiber-optic cleaner and follow
the instructions accompanying the product.
Step 6 Clean the far-end optical fiber cable ends:
a. Clean the fiber cable ends according to local site practice.
b. If no local practice exists, use a CLETOP Real-Type or equivalent fiber-optic cleaner and follow
the instructions accompanying the product.
Step 7 If error remains, check for a timing alarm by following the procedure in the “SYNCPRI” section on
page 1-52.
1.5.8 AUTOLSROFF
Critical, Service-affecting
The automatic laser off alarm is raised when the OC192 LR/STM64 LH 1550 card temperature exceeds
90 degrees Celsius. The internal equipment automatically shuts down the OC192 LR/STM64 LH 1550
laser when the card temperature rises to prevent the card from self-destructing.
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
The ONS 15454 SDH is a Class I (CDRH) and Class 1M (IEC) laser system.
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.
Procedure: Clear the AUTOLSROFF Alarm
Step 1 Read the temperature displayed on the ONS 15454 SDH LCD front panel.
Step 2 If the temperature of the ONS 15454 SDH exceeds 90 degrees Celsius, complete the procedure in the
“Clear the HITEMP Alarm” section on page 1-35.
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