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Home > Archive > Voice over IP Cisco > December 2005 > Voice Quality issue; Echo
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Voice Quality issue; Echo
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| DeRooy, Aaron H 2005-12-02, 5:45 pm |
| The customer is complaining of echo. If I change the echo canceller
coverage to 32ms and the ERL to 4db, what effect will that have? Will it
cause the echo canceller to take up to 3 seconds to converge or maybe
result in sentences being chopped off? Looking for any guidance on
making echo canceller coverage and/or erl changes.
Aaron
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| Mark Snow 2005-12-02, 5:45 pm |
| Aaron,
An ERL plan must have at least a 6db difference between the Tx and Rx sides
of the ECAN to converge. Without this difference between the two, the ECAN
will never even engage ....
And to answer your question (and it's not the preferred answer I'd like to
give) but yes, an ECAN can take up to 3 seconds to fully converge, though a
lot of times it is much quicker than that ...
What version of code on what box are you running?
Thought of running the VIC2 with the Extended 128ms ECAN daughter card?
-Mark
CCIE Voice #14073
> -----Original Message-----
> From: cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-
> bounces@puck.nether.net] On Behalf Of DeRooy, Aaron H
> Sent: Friday, December 02, 2005 8:44 AM
> To: cisco-voip@puck.nether.net
> Subject: [cisco-voip] Voice Quality issue; Echo
>
> The customer is complaining of echo. If I change the echo canceller
> coverage to 32ms and the ERL to 4db, what effect will that have? Will it
> cause the echo canceller to take up to 3 seconds to converge or maybe
> result in sentences being chopped off? Looking for any guidance on
> making echo canceller coverage and/or erl changes.
>
> Aaron
>
>
>
> ________________________________________
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> cisco-voip mailing list
> cisco-voip@puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
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| Ryan Ratliff 2005-12-02, 5:45 pm |
| Check out http://www.cisco.com/en/US/tech/tk652/tk698/
technologies_tech_note09186a0080149a1f.shtml.
-Ryan
On Dec 2, 2005, at 9:44 AM, DeRooy, Aaron H wrote:
The customer is complaining of echo. If I change the echo canceller
coverage to 32ms and the ERL to 4db, what effect will that have? Will it
cause the echo canceller to take up to 3 seconds to converge or maybe
result in sentences being chopped off? Looking for any guidance on
making echo canceller coverage and/or erl changes.
Aaron
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cisco-voip@puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip
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