CHAPTER
5-1
Cisco ONS 15501 User Guide
78-14134-02, Release 2.0
5
Troubleshooting
This chapter discusses basic fault investigation and diagnostic (troubleshooting) procedures for the
CiscoONS 15501.
This chapter includes the f ollowing sections:
•Basic Diagnostic Procedures, page 5-1
•Isolating the Problem, page 5-2
•Password Recovery, page 5-3
•Technical Support, page 5-4

Basic Diagnostic Procedures

When a problem occurs over the n etwork, use the following three ba sic diagnostic procedures to
determine if the CiscoONS 15501 is the source of the problem:
•Verify the power connection.
•Verify the Ethernet connection.
•Verify the alarm connection.
To verify the power connection, follow these s teps:
Step 1 Make sure that power is securely co nnected to the unit and that extern al DC power is being applied.
Step 2 Check for LED lamp activity on the front panel. Disregard the color or number of LEDs illuminated at
this time. Verify only that one or mo re is on, indicating that the chassis is receiving power.
Step 3 Check the following areas for p ossible problems if no LEDs ar e on:
•Verify that the power connection to the chassis is firmly made.
•Verify that the circuit power switch(es) are in the on position.
•Verify that the external source DC power circuit breaker(s) are on.
•Verify that the external power wires are delivering power correctly.