Chapter 6 Troubleshooting
Problem Solving with Subsystems
•Cable headend
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 uBR7225VXR router for the first time, observe the startup sequence described in the “Powering On the Cisco uBR7225VXR Router” section on page
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 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.
Note On rare occasions, an LED may be faulty.
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.You should immediately hear the fans operating. If not, proceed to the “Cooling Subsystem” section on page
2.The power supply’s green Input 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 Input OK LED does not go on, proceed to the “Power Subsystem” section on page
3.The enabled LED on each cable interface line card comes on when the network processing engine completes its initialization of the card for operation. The enabled LED indicates that the line card is receiving power and has been recognized by the network processing engine; it does not indicate the state of the individual interfaces on the card. If an enabled LED fails to come on, refer to the “Troubleshooting Cable Interface Line Cards” section on page
4.When all LEDs come on to indicate that the system has booted successfully, the initial system banner should appear on the console screen. If it is not displayed, refer to the “Console and Auxiliary Port Connection Equipment” section on page
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
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