Document ID: 8521
Updated: May 25, 2006
Contents
Introduction
This document provides resources for users who experience echo through their Virtual Central Office (VCO) network.
Prerequisites
Requirements
There are no specific requirements for this document.
Components Used
The information in this document is based on these software and hardware versions:
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Hardware: Cisco VCO4K, VCO20 and VCO80 products
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Software: All Generics
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
Conventions
For more information on document conventions, refer to the Cisco Technical Tips Conventions.
Echo Cancellation
"Echo Cancellation" is not a feature of the VCO/4K. In long-distance transmission, be it through microwave, submarine cable, or satellite, echo is almost always present and an echo canceller must be introduced when the echo becomes noticeable.
Here is a source for echo canceller products:
2500 Series Echo
Cancellers
Related Information
Open a Support Case 
(Requires a Cisco Service Contract.)
Related Cisco Support Community Discussions
The Cisco Support Community is a forum for you to ask and answer questions, share suggestions, and collaborate with your peers.
Refer to Cisco Technical Tips Conventions for information on conventions used in this document.