Cisco 877 DSL Line Noise

Answered Question
Aug 11th, 2009

Greetings, we have recently installed an 877 which fails to sync with the DSL circuit, following debugging of the ATM interface the following error is noted.

000452: *Mar 1 01:51:15.919 GMT: DSL(ATM0): Open failed: Req. min. rate + noise margin + PSD not possible on the line - retrying

Whilst i appreciate this may be a problem with the DSL circuit a BT 2Wire Router connects without issue as per the attached image. I have also tried forcing the DSL operating mode to both ADSL2 and ADSL2+ without success.

Would i be correct in assuming that the line is too noisy for the 877 to sync upto? Could i also ask if anyone has experienced a similar issue in the past?


Correct Answer by Paolo Bevilacqua about 7 years 6 months ago

Can you try 3.0.33 firmware from

failing that you will need help from cisco TAC.

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Overall Rating: 5 (2 ratings)
exonetinf1nity Tue, 08/11/2009 - 05:00

Thank you for that, i wasnt able to find these files anywhere on

Thank you, i shall let you know if it resolves the issue.



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