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New Member

DSL configuration on Cisco 1720

I have a Cisco 1720 with 1-Port ADSL WAN interface card installed. I configured the DSL WAN interface but couldn't turn it on with the no shutdown command. Any suggestions?

Cisco Employee

Re: DSL configuration on Cisco 1720

After "no shut" under the atm interface if "shutdown" is not there in the running config that means the dsl/atm interface is already in "no shut" mode..Now what does "sh interface atm x/y" reports?

It it reports "interface is up" means dsl line is trained..Tejal

New Member

Re: DSL configuration on Cisco 1720

Here is "sh interface" reports.

Cisco#conf t

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

Cisco(config)#int atm0

Cisco(config-if)#no shut


Cisco#sh int atm0

ATM0 is down, line protocol is down

Hardware is DSLSAR (with Alcatel ADSL Module)

Internet address is

MTU 4470 bytes, sub MTU 4470, BW 992 Kbit, DLY 2060 usec,

reliability 0/255, txload 1/255, rxload 1/255

Encapsulation ATM, loopback not set

Encapsulation(s): AAL5, PVC mode

24 maximum active VCs, 256 VCs per VP, 1 current VCCs

VC idle disconnect time: 300 seconds

Last input never, output never, output hang never

Last clearing of "show interface" counters never

Queueing strategy: fifo

Output queue 0/40, 0 drops; input queue 0/75, 0 drops

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

0 packets output, 0 bytes, 0 underruns

0 output errors, 0 collisions, 10 interface resets

0 output buffer failures, 0 output buffers swapped out


Cisco Employee

Re: DSL configuration on Cisco 1720

Its dow/down means the dsl line is not either plugged in or not trained (connected) to the provider..Its Layer 1 problem..The router is not seeing a carrier on the ADSL interface..

Here is the link which helps you to troubleshoot more in Layer 1 issues.

Did you talk to the provider about that?


New Member

Re: DSL configuration on Cisco 1720


Did you get anywhere with this?

Just wondered because I have the same problem althought the router works on my adsl connection it doesnt work on the customers. The customers circuit is OK because I have used a USB ADSL modem on it to verify the line was ok.



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