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Cisco 1700 "DOWNGRADEDBW" error with ADSL wic module

Hello,

After I've configured a Cisco 1700 router with the ADSL wic module installed,

every X seconds a strange error message appears:

%DSLSAR-1-DOWNGRADEDBW: PCR and SCR for VCD 1 (8/35)

has been reduced to 160k 160k due to insufficient upstream bandwidth

After the first error message of this kind, effectively

if I put in the router the command 'sh int ATM 0',

I can see that the bandwidth is set to 160k (while the line should be 640k).

The problem affected multiple different 1700 router, with different ADSL

wic modules and two different IOS versions (12.2 and 12.1).

Should it be a bad configuration of the telco line, or a router configuration error?

An obviously similar router configuration, put on a Cisco 827 series, gave no errors.

On the Cisco web site, I've found the error.. I report it here for your convenience:

----------------------------------------

Error Message:

%DSLSAR-1-DOWNGRADEDBW: PCR and SCR for VCD [dec] ([dec]/[dec]) has

been reduced to [dec]k [dec]k due to insufficient upstream

bandwidth

Explanation: The DSL line has insufficient upstream bandwidth to

support the guaranteed bandwidth that has been configured for the

virtual circuits.

Recommended Action Copy the error message exactly as it appears

on the console or in the system log, contact your Cisco technical

support representative, and provide the representative with the

gathered information.

----------------------------------------

Thanks for your precious attention.

Best regards,

Marco Pizzi.

1 REPLY
Cisco Employee

Re: Cisco 1700 "DOWNGRADEDBW" error with ADSL wic module

Marco,

While a DSL is establish, you might face issue on the

line, the DSL protocol can reduce upstream/downstream

in those sepecific case.

This might be the case, do a "sh dsl int atm0"

and look at upstream value, number of hec error, ...

Those will give you an idea on how bad your line is.

This errors can be due to crosstak and other noise

encountered on your line.

The first thing I would propose if the above is verified, is to ask the Telco to check the line.

Hope this helps

Alain

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