DSL Woes.

Unanswered Question
Sep 6th, 2007
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Hi,

I'm having a little issue with a router at one of my sites that connects via dual DSL connections. It is a 2610XM router with 2 ADSL WICs installed.

The DSL circuits terminate onto a DS3 that connects directly to a 7206 at my main site.

Both of the DSLs are provisioned through the LEC as 1.5mb down / 1mb up.

I did a show interface atm0/1 this morning and saw that the bandwidth was down to 129k with the delay reading 10,060msec. I shutdown the interface, brought it back up again, and the bandwidth reset to 864k, which is better than 129k, but nowhere near what it should be. Both of the DSL circuits have experienced this issue. The DSL Operating mode is set to Auto, one of the DSLs comes up as ANSI T1.413, the other as ITU G.992.1 (G.DMT). Do you think this is a firmware issue or do you think that the provider needs to fix something with their provisioning?

Thanks.


interface ATM0/1

description DSL#2

no ip address

no ip mroute-cache

no atm ilmi-keepalive

dsl operating-mode auto

!

interface ATM0/1.1 point-to-point

bandwidth 1000

ip address <IP> 255.255.255.252

no ip mroute-cache

delay 320

pvc 0/32

encapsulation aal5snap


>sh dsl int atm0/0

Alcatel 20150 chipset information

ATU-R (DS) ATU-C (US)

Modem Status: Showtime (DMTDSL_SHOWTIME)

DSL Mode: ANSI T1.413

ANSI Issue/rev: 2/1 2/1

Vendor ID: 0x0022 0x0022

Capacity Used: 24% 100%

Noise Margin: 29.0 dB 9.0 dB

Output Power: 20.0 dBm 12.0 dBm

Attenuation: 25.0 dB 15.0 dB

Defect Status: None None

Last Fail Code: None

Selftest Result: 0x00

Subfunction: 0x15

Interrupts: 2668 (0 spurious)

PHY Access Err: 0

Activations: 3

Init FW: embedded

Operation FW: embedded

SW Version: 3.8131

FW Version: 0x1A04


Interleave Fast Interleave Fast

Speed (kbps): 1536 0 832 0

Reed-Solomon EC: 0 0 448 0

CRC Errors: 0 0 4 0

Header Errors: 0 0 0 0

Bit Errors: 0 0

BER Valid sec: 8158 0

BER Invalid sec: 0 0


>sh dsl int atm0/0

Alcatel 20150 chipset information

ATU-R (DS) ATU-C (US)

Modem Status: Showtime (DMTDSL_SHOWTIME)

DSL Mode: ANSI T1.413

ANSI Issue/rev: 2/1 2/1

Vendor ID: 0x0022 0x0022

Capacity Used: 24% 100%

Noise Margin: 29.0 dB 9.0 dB

Output Power: 20.0 dBm 12.0 dBm

Attenuation: 25.0 dB 15.0 dB

Defect Status: None None

Last Fail Code: None

Selftest Result: 0x00

Subfunction: 0x15

Interrupts: 2668 (0 spurious)

PHY Access Err: 0

Activations: 3

Init FW: embedded

Operation FW: embedded

SW Version: 3.8131

FW Version: 0x1A04


Interleave Fast Interleave Fast

Speed (kbps): 1536 0 832 0

Reed-Solomon EC: 0 0 482 0

CRC Errors: 0 0 4 0

Header Errors: 0 0 0 0

Bit Errors: 0 0

BER Valid sec: 8824 0

BER Invalid sec: 0 0


DMT Bits Per Bin

<Clipped for length>


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paolo bevilacqua Thu, 09/06/2007 - 08:20
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Hi,


which IOS are you using? upgrading to the latest will upgrade the ADSL firmware, that can make the circuit more stable.


The incongruence between ANSI and ITU is strange however, I would check with the provider how things are supposed to work, and hardcode the router per correct standard (dsl operating-mode).


hope this helps, please rate post if it does!

rtjensen4 Thu, 09/06/2007 - 08:38
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IOS is 12.3(17a).

Cisco Internetwork Operating System Software

IOS (tm) C2600 Software (C2600-IS-M), Version 12.3(17a), RELEASE SOFTWARE (fc2)


I will persue both of your suggestions. Thanks, I will post when I know more.

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