Cisco Systems UBR-3X10 manual Troubleshooting Upstream and Downstream Switch Modules, Status LEDs

Chapter 6 Troubleshooting

Troubleshooting the Installation and Setup

Troubleshooting Upstream and Downstream Switch Modules

Each upstream and downstream switch module has four LEDs that indicate the working status of the port. The upstream switch module operates over the frequency range of 5 to 70 MHz. The downstream (high-frequency) switch module operates over the frequency range of 54 to 860 MHz. During normal system operation, upstream switches all direct traffic to their respective default termination interfaces.

Each switch module takes on eight signal inputs from the power splitter and routes the signal to a protect output, or splits the inputs into two groups of four inputs and sets up the switch to select one of four inputs as a protect output. The relays are electromechanical and controlled through the power interface connector.

The switch card should provide a minimum of 60 dB of isolation from connector port to connector port during normal operation and more than 20 dB when operating in protect mode.

Status LEDs

Each upstream and downstream switch module has four LEDs on the faceplate that indicate the working status of the port as described in Table 6-5.

Table 6-5	Switch Board LED Descriptions
LED Name	Color	Description
Protect 1	Green/Yellow	Indicates CMTS/PROTECT 1
Protect 2	Green/ Yellow	Indicates CABLE PLANT/PROTECT 2
Error 1	Off/Yellow	Indicates a channel problem in 1
Error 2	Off/Yellow	Indicates a channel problem in 2

When an upstream or downstream switch module initially boots, the LEDs briefly cycle on in sequence. After the bootup,

•The PROTECT1/PROTECT2 LEDs are on/off for single protect mode, or on/on for dual protect mode. The LED color reflects the current setting of the module protect mode switch—green for idle or yellow for any protect position.

•The ERROR1/ERROR2 LEDs stay on until the Ethernet controller detects and enumerates the switch module.

•If either of these LEDs remain on (yellow) after the system boot sequence, there is either a communications failure or a switch position failure. Use the test module command to diagnose failure.

If you are unable to resolve the problem, refer to the “Obtaining Technical Assistance” section on page 12 for information on contacting Cisco technical assistance.

Cisco uBR-3x10 RF Switch Hardware Installation and Cabling Guide

6-6 OL-1984-06