Cisco 877 DSL Line Noise

Answered Question
Aug 11th, 2009
User Badges:

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 11 months ago

Can you try 3.0.33 firmware from

failing that you will need help from cisco TAC.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (2 ratings)
exonetinf1nity Tue, 08/11/2009 - 05:00
User Badges:

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.


paolo bevilacqua Wed, 08/12/2009 - 04:16
User Badges:
  • Super Gold, 25000 points or more
  • Hall of Fame,

    Founding Member

Very good, thank you for the nice rating and good luck!


This Discussion