Cisco 7246 - uBR Router, Руководство по установке оборудования

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6-6
Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide
OL-5421-03
Chapter 6 Troubleshooting
Processor Subsystem
To determine if the fans are operating, listen for them. In noisy environments, place your hand on the
left side of the chassis (when viewing the chassis from the front) to feel for air being forced out the vents.
a. If yes, the power to the fan tray is good.
b.
If no, there is a problem with the fan tray or power. See the “Power Subsystem” section on page 6-5 .
Step 2 Verify that the following message is not displayed.
Queued messages:
%ENVM-1-SHUTDOWN: Environmental Monitor initiated shutdown
If the message is displayed, the system has detected an overtemperature condition or power
out-of-tolerance condition inside the chassis.
The shutdown message could also indicate a faulty component or temperature sensor. Before the system
shuts down, use the
show environment or show environment table command to display the internal
chassis environment.
If an environmental shutdown results from a power out-of-tolerance condition, the power OK LED goes
off and the system shuts down. See the
“Power Subsystem” section on page 6-5 .
Step 3 Although an overtemperature condition is unlikely at initial startup, ensure that heated exhaust air from
other equipment is not entering the inlet vent on the router and that there is sufficient clearance around
the sides of the chassis to allow cooling air to flow. Refer to the
“Site Environment” section on page 2-6
and the “Equipment Racks” section on page 2-17 for preventive site configurations.
Processor Subsystem
The processor subsystem is comprised of the I/O controller, the network processing engine, all port
adapters, the clock card (Cisco uBR7246VXR), and all cable interface cards. The I/O controller and
network processing engine are required system components. The system cannot operate unless the I/O
controller and network processing engine are installed properly; however, the system can operate
without any port adapters or cable interface cards installed.
If a port adapter or cable interface card is partially connected to the midplane, the card sends connection
incomplete signals to the processor, which then faults the peripheral component interconnect (PCI) bus
and causes the system to hang.
Therefore, first ensure that the I/O controller and the network processing engine are installed properly
and the system software has initialized successfully. Then, if necessary, you can troubleshoot individual
port adapters, the cable clock card (Cisco uBR7246VXR only), and the cable interface cards.
Troubleshooting the I/O Controller
Check the following items to help isolate the problem.
Step 1
Verify that the I/O controller LEDs come on when the system power switch is turned on.
a. If the LEDs stay off, first refer to the “Power Subsystem” section on page 6-5 and the “Cooling
Subsystem” section on page 6-5 to ensure that both the fans and the power supply are functioning
properly.
Step 2
If the power supply and fans appear operational but none of the I/O controller LEDs are on, check to see
if an improperly connected I/O controller or port adapter has hung the system.