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Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
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Chapter6 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 page6-4.
Step2 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 LEDs goes
off and the system shuts down. See the “Power Subsystem” section on page6-4.
Step3 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 page2-5
and the “Equipment Racks” section on page 2-15 for more on site configurations.
Processor Subsystem The processor subsystem is comprised of the network processing engine and all cable interface cards.
The network processing engine is a required system component. The system cannot operate unless the
network processing engine is installed properly; however, the system can operate without any
cable interface card installed.
Note The network processing engine (NPE-G1 or NPE-G2) used in Cisco uBR7225VXR allows the router to
work without an I/O controller. NPE-G1 and NPE-G2 works with both Cisco uBR7225 and Cisco
uBR7246 chassis.
If a 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 network processing engine is installed properly and the system software
has initialized successfully. Then, if necessary, you can troubleshoot individual cableinterface cards.
Troubleshooting the Network Processing Engine
Check the following to help isolate a problem with the network processing engine (NPE):
Step1 If the NPE enabled LED does not go on as expected:
a. Turn off the power to the router.