Cisco 827 - 827 Router - EN Guia de Resolução de Problemas descarregar pdf (Página 68)

Is the ATM interface in an administratively down state?

To determine if the ATM0 interface is administratively down, issue the following command in enable mode

on the router:

Router#show interface atm 0

ATM0 is administratively down, line protocol is down

<... snipped ...>

If the ATM0 interface status is administratively down, issue the no shutdown command under the ATM0

interface.

Router#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#interface atm 0

Router(config−if)#no shut

Router(config−if)#end

Router#write memory

Is the cable pinout correct?

If the ATM0 interface status is down and down, the router is not seeing a carrier on the ADSL line. This

generally indicates one of two issues:

The active pins on the DSL wall jack are incorrect.1.

Your ISP has not turned up a DSL service on this wall jack.2.

Cisco DSL Router xDSL Port Pinouts

The RJ−11 connector provides an xDSL connection to external media via a standard RJ−11 6−pin modular

jack.

Pin Description

3 XDSL_Tip

4 XDSL_Ring

To determine if the ATM0 interface is down and down, issue the show interface atm 0 command from

enable mode of the router:

Router#show interface atm 0

ATM0 is down, line protocol is down

<... snipped ...>

If the ATM interface is down and down—not administratively down—check the pinout of your DSL wall

jack. The DSL Router uses a standard RJ−11 (4−pin or 6−pin) cable to provide the ADSL connection to the

wall jack. The center pair of pins on the RJ−11 cable is used to carry the ADSL signal (pins 3 and 4 on a

6−pin cable, or pins 2 and 3 on a 4− pin cable).

If you are sure you have the right pins on the wall jack and the ATM0 interface is still down and down,

replace the RJ−11 cable between the DSL port and your wall jack. If the interface is still down and down after

replacing the RJ−11 cable, contact your ISP and have the ISP verify that DSL service has been enabled on the

wall jack you are using.

Cisco DSL Router Configuration and Troubleshooting Guide

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Cisco 827 - 827 Router - EN Guia de Resolução de Problemas Página 68