Cisco GS7000 Installation And Operation Manual page 216

Appendix B
Enhanced Digital Return Multiplexing Applications
Follow the steps in the table below to troubleshoot the transmitter module.
Symptom
No optical signal output
Symptom
No optical signal output
(cont'd)
196
Possible Cause
Laser temperature could be
too high or low.
Laser could be faulty.
Automatic power control
circuit failure.
Damaged fiber.
Possible Cause
One or more power supply
voltages are out of
specification.
No AC at receptacle.
Blown fuse on the power
supply.
Faulty module.
Possible Solutions
Allow up to one minute after
power is ON for the
temperature to stabilize.
If still no output, contact the
Cisco Technical Service Center
for assistance.
Contact the Cisco Technical
Service Center for assistance.
Contact the Cisco Technical
Service Center for assistance.
Contact the Cisco Technical
Service Center for assistance.
Possible Solutions
Check the power supply for
proper operation.
Check the receptacle for AC
power.
Check the power supply fuse
and replace as necessary.
Contact the Cisco Technical
Service Center for assistance.