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5-3
Cisco ONS 15501 User Guide
78-14134-02, Release 2.0
Chapter 5 Troubleshooting
Password Recovery
If all LEDs on the front panel are off:
• Check that primary and user-optional external power is available and that the DC power wiring is
properly and firmly connected to the appropriate screw terminals.
• Check that the external DC supply power switch is turned to the on position.
If the Power LED blinks green, one of the two power supplies has failed or is not installed.
If the Power LED is green but the unit has failed and no other LEDs are on, then the internal power
regulating circuit may have failed. Contact the Cisco Technical Assistance Center (TAC) immediately
for assistance.
If the Fail LED is red, then a major trouble condition exists in the Cisco ONS 15501 hardware. Contact
the Cisco Technical Assistance Center (TAC) immediately for assistance.
Warning
Infra-red laser energy may be present on the cable connected to the receiving (Input) connector,
at the transmitting (Output) optical fiber connector, or the monitoring (Optical Monitor) connector.
To avoid potential damage to the eyes, do not look directly into this connector or cable. When an
optical cable is not attached, place the supplied protective cap over the connector and the optical
fiber cable.
If the LOS (loss of signal) LED is yellow, then the input optical signal has disappeared or has fallen
below the detection level.
• Check to see that the input optical cable is securely seated in its connector.
• Connect an optical power meter on an optical spectrum analyzer to the Output Monitor optical
connector and check for proper level of the outgoing signal.
• Check with the distant transmitting end to determine if the signal is leaving that site at the proper
level.
• Check that the input power mean and trigger values are configured correctly for the actual desired
input signal.
Password Recovery
If you have forgotten your passwords, you must power cycle the system and use the restore command
to reset the passwords to the defaults. The restore command can only be entered from a session on the
serial port, not from a Telnet session.
Caution Be sure not to lose the passwords. Powercycling the system disrupts data flow.
To recover the system passwords, follow these steps
Step 1 Power cycle the system.
Step 2 From a HyperTerminal session on the console port, press the Enter key within 15 seconds after the
password prompt appears.
Step 3 At the “edfa >” prompt, type the restore command and press the Enter key.
Step 4 Answer yes to command prompts and press the Enter key.