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Caution

If the port adapters, cable interface line cards, network processing engine, or I/O controller are not properly seated

or not fully locked into place, the Cisco uBR7246VXR router might enter a continuous restart loop.

f. A ﬂash memory card is installed in its Personal Computer Memory Card International Association (PCMCIA) slot.

g. Each AC-input power cable is connected and secured with the cable-retention clip.

h. The +48 and –48 DC leads are secured underneath the strain-relief cover on the power supply faceplate.

i. Each DC lead is connected and secured to the power source and the chassis is properly grounded.

j. For installed DC-input power supplies, ensure that the power source is restored.

k. The console terminal is turned on.

Step 2

Place the power switch on the power supply in the ON (|) position. Repeat this step if a second power supply is installed.

The green OK LED on the power supply comes on.

Step 3

Listen for the fans; you should immediately hear them operating. In a very noisy environment, also look for air

movement around the chassis to verify that the fans are operating. If the Cisco uBR7246VXR router was recently

switched off, it might take up to 90 seconds for the power supply to restart and the fans to start operating.

Step 4

During the boot process, observe the system LEDs. The LEDs on most of the port adapters come on and go off in an

irregular sequence. Some may come on, go off, and come on again for a short time. On the I/O controller, the POWER

OK LED comes on immediately.

Step 5

Observe the initialization process. When the system boot is complete (a few seconds), the NPE begins to initialize the

port adapter, cable interface line cards, and the I/O controller. During this initialization, the LEDs on each port adapter

behave differently (most flash on and off). The ENABLED LED on each port adapter and cable interface line card comes

on when initialization is complete, and the console screen displays a script and system banner similar to the following:

Cisco Internetwork Operating System Software

IOS (tm) uBR7200 Software (uBR7200-I-M), Version 12.0(5)T [smith 100]

Compiled Mon 12-Jul-99 04:10 by smith

Tip

To facilitate headend or hub installation, a Cisco uBR7246VXR universal broadband router equipped with at least one

cable interface line card (Cisco uBR-MC16C,E,S,X or Cisco uBR-MC28C,X), generates a downstream IF carrier when

it starts running. The downstream IF carrier will be present if the line card is properly installed and passes diagnostics,

the router has been powered on for more than two minutes, the IF downstream shutdown command (no cable

downstream if-output) has not been configured, or the Cisco uBR7246VXR router is not in ROMMON mode.

The amplitude and shape of the downstream IF carrier does not change after the router is configured, regardless of

modulation scheme used whether 64 or 256-QAM.

Tip

By default, Cisco uBR-MC16U or Cisco uBR-MC28U cable interface line cards have no output until the DS freq is set

and the command no cab down rf-shut is applied.

Troubleshooting the Installation

This section contains information to help installers and technicians troubleshoot the hardware installation.

Figure 13 shows the general troubleshooting strategy used to troubleshoot the hardware. Refer to this flow chart as necessary,

and follow the steps to isolate hardware problems to a specific subsystem.

For cable-specific commands for the Cisco uBR7246VXR universal broadband router, refer to Cisco Broadband Cable

Command Reference Guide at the following URL:

http:/www.cisco.com/univercd/cc/td/doc/product/cable