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Cisco uBR924 Router Hardware Installation Guide
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Chapter 3
Installing the Cisco uBR924 Router
Router Power-On and Initialization Sequence
Router Power-On and Initialization Sequence
When the Cisco uBR924 router is connected and powered on, it executes automatic self-diagnostic and
installation procedures. The following procedure describes what you should see during this process.
Note
For the router to complete its power-on sequence, a number of tasks must be completed at
the CMTS. Refer to the “Initial Power-On and Provisioning” section on page 1-4 for an
overview of the router’s initialization and provisioning processes.
While the Cisco uBR924 cable access router initializes:
Step 1
Watch the LEDs on the front of the router. When the cable access router first powers on, all LEDs
(except for the four Ethernet LEDs and the ACT LED) briefly light and then turn off. As self-test is
executed, various LEDs light to reveal diagnostic progress and turn off when self-test is complete.
Step 2
The OK LED then blinks as the router completes self-test and boots a Cisco IOS image. When this is
finished, the OK LED lights again.
Note
The six LEDs in the lower right of the front panel display—V OK, V1, V2, DS,
US, DSNR—display the power-on self-test progress and status. Should the
self-test fail, these six LEDs display error codes. Because self-test failed, the OK
LED remains off. Refer to the “Initialization and Self-Test Problems” section on
page 4-2 for a description of self-test LED error patterns.
Step 3
During the router’s initialization and download, the green OK and ACT LEDs both blink. After
completing the download procedure (which could take up to 10 minutes if downloading a new
Cisco IOS image as well as a configuration file), the green OK LED remains on.
Step 4
Check that the DS, US, LINK, and DSNR LEDs remain on to indicate the router is operational and
receiving a healthy signal:
•
The DS LED reveals the router is locked to a downstream channel.
•
The US LED reveals the router has established connectivity with the CMTS and is operating within
6 dB of desired power level (generally within 3 dB).
•
The LINK LED reveals the cable interface is operational.
•
The DSNR LED reveals the router is receiving a quality downstream signal with a low
signal-to-noise ration and that is 5 dB above the downstream lock threshold.
Step 5
Check the remaining LEDs for proper operation:
•
The ACT LED blinks to indicate activity on the cable interface.
•
The Ethernet 1, 2, 3, 4 LEDs blink to indicate activity from the PCs and other customer premises
devices connected to the corresponding Ethernet ports.
•
The V OK LED indicates the VoIP system is operational. The V1 and V2 LEDs light when the voice
ports are active. (These LEDs light only if the router has loaded a Cisco IOS image with voice
support.
Step 6
If all LEDs appear normal, proceed to the “Verifying Installation” section on page 3-13 to test the router
and its connection to each part of the network. If any problems occur, proceed to Chapter 4,
“Troubleshooting,” to troubleshoot and solve the problem.
