Identifying Startup Problems - Cisco 7246 - uBR Router Hardware Installation Manual

Chapter 6 Troubleshooting
A port adapter or cable interface line card that is partially installed in the midplane can cause the system
Caution
to hang and crash.
•
The following section helps you isolate a problem to one of the subsystems and directs you to the
appropriate troubleshooting section.

Identifying Startup Problems

When you start up the Cisco uBR7200 series router for the first time, observe the startup sequence
described in the
contains a detailed description of the normal startup sequence.
Although an overtemperature condition is unlikely at initial startup, the environmental monitoring
functions are included in this chapter because they also monitor internal voltages.
Startup problems are commonly caused by source power problems or a board (network processing
engine, I/O controller, port adapter, or cable interface line card) that is not properly connected to the
midplane. Always check that your boards are properly installed in the chassis.
With the exception of the fan tray and network processing engine, LEDs indicate all system states in the
startup sequence. By checking the state of the LEDs, you can determine when and where the system
failed in the startup sequence.
On rare occasions, an LED may be faulty.
Note
Use the following descriptions to isolate the problem to a subsystem, then proceed to the appropriate
sections to try to resolve the problem. When you start up the system, by turning on the power supply
switch, the following should occur:
1.
2.
3.
OL-5421-03
Cable headend subsystem—External to the Cisco uBR7200 series router, this subsystem can prevent
operation of the universal broadband router if the headend is not properly set up for the introduction
of digital data into the hybrid fiber-coaxial (HFC) network.
"Powering On the Cisco uBR7200 Series Router" section on page
You should immediately hear the fans operating. If not, proceed to the
on page 6-5. If you determine that the power supply is functioning normally and that a fan is faulty,
contact a customer service representative. If a fan does not function properly at initial startup, there
are no installation adjustments that you should make.
The power supply's green power OK LED (at the rear of the chassis) should go on immediately when
you place the power supply switch in the ON (|) position, and should remain on during normal
system operation. If the green power OK LED does not go on, proceed to the
section on page 6-5.
The LEDs on the I/O controller should go on as follows:
a. The I/O power OK LED comes on immediately and indicates that the I/O controller is receiving
DC power from the Cisco uBR7200 series router midplane. This LED comes on during a
successful boot and remains on during normal operation of the router.
If this LED remains off when starting the router, either there is a problem with the power supply
(it is damaged or not connected to the Cisco uBR7200 series router midplane), or the network
processing engine (NPE) or the I/O controller is not connected to the midplane. Proceed to the
"Troubleshooting the I/O Controller" section on page
Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide
Problem Solving with Subsystems
3-25. This section
"Cooling Subsystem" section
"Power Subsystem"
6-6.
6-3