Cisco Systems UBR7225VXR specifications Problem Solving with Subsystems

Chapter 6 Troubleshooting

Problem Solving with Subsystems

Figure 6-1 Troubleshooting Strategy for Startup Problems

Turn on

system power

					Check system
					state with
					interface card
					LEDs
	No		Reseat cable	No
End		Cable interface	interface		Interface card
		card	cards and		LEDs OK?
		LEDs OK?	restart
		Yes
					Check the
					headend
					setup
		Digital			Digital
	No		Troubleshoot	No
End		data	headend		data
		connections	setup for		connections
		enabled?	RF and data		enabled?
		Yes				Yes
		System
		startup
		successful

DC OK	No	Troubleshoot	DC OK	No
		power
LED on?			LED on?
		subsystem
Yes			Yes
Fans	No	Troubleshoot	Fans	No
operating?		cooling	operating?
		subsystem
Yes			Yes
Check system
state with I/O
controller LEDs
I/O	No	Troubleshoot I/O	I/O	No
controller			controller
		controller
LEDs			LEDs
		and restart
OK			OK
Yes			Yes
Check system
state with port
adapter LEDs
Port	No	Troubleshoot	Port	No	Obtain
adapter			adapter
enabled		port adapters	enabled		technical
LEDs		and restart	LEDs		assistance
on?			on?			62742
Yes			Yes		End

Problem Solving with Subsystems

Tip Isolating a problem to a specific subsystem simplifies the troubleshooting process.

The first step in isolating a problem is to compare what the system is doing to what it should be doing. Usually a startup problem is caused by a single component, so first isolating the problem to a subsystem rather than troubleshooting every component in the entire system is more efficient. The

Cisco uBR7225VXR router subsystems are listed below.

•Power subsystem—Includes the power supplies, the external power cable, and the midplane.

•Cooling subsystem—The chassis fan tray is the single component in this subsystem. The fans should be operating whenever system power is on.

•Processor subsystem—Includes the network processing engine and cable interface line cards.

The system memory and management functions reside on the network processing engine. The enabled LED on each cable interface line card indicates if the cable interface line card is initialized.

Caution A cable interface line card that is partially installed in the midplane can the cause system to hang and crash.

Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide

6-2 OL-17309-02