This chapter discusses basic fault investigation and diagnostic (troubleshooting) procedures for the
Cisco ONS 15501.
This chapter includes the following sections:
Basic Diagnostic Procedures
When a problem occurs over the network, use the following three basic diagnostic procedures to
determine if the Cisco ONS 15501 is the source of the problem:
To verify the power connection, follow these steps:
Make sure that power is securely connected to the unit and that external DC power is being applied.
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 more is on, indicating that the chassis is receiving power.
Check the following areas for possible problems if no LEDs are on:
78-14134-01, Release 1.0
Basic Diagnostic Procedures, page 5-1
Isolating the Problem, page 5-2
Password Recovery, page 5-3
Technical Support, page 5-3
Verify the power connection.
Verify the Ethernet connection.
Verify the alarm connection.
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.
C H A P T E R
Cisco ONS 15501 User Guide