The animated TECHTip Tutorial is available here.

This tutorial is on Echo, or, rather, EC [Echo Cancellation]. Echo is the reflection of the original back to the sender. There are many causes for echo but can occur in many types of network including SIP. SIP [Session Initiation Protocol] is a signaling protocol for internet conferencing, telephony, presence, events notification (emergency calling) and instant messaging.

Hybrid Echo is an impedance mismatches within the 2-wire to 4-wire (T-1) conversion called the Hybrid. Impedance is a measure (expressed in Ohms) of the opposition (resistance) to the flow of electricity and changes value as the frequency of the electricity changes. Capacitive reactance causes impedance to rise as the signal frequency decreases, whereas the inductive reactance causes impedance to rise as the frequency increases. That is, the higher the impedance, the lower the current.

About TECHtionary
TECHtionary is the World’s first and largest animated library/magazine on technology - Web Hosting Magazine’s Editor’s Choice for Technical Help. TECHtionary produces white papers, magazine articles, in-depth product reviews, training tools, and custom animations. Call 303-594-3047 or e-mail  cross at gocross.com to let us show you how we can help you with exciting new tutorials on your products and services.

[tags]sip,techtionary,voip echo,hybrid echo,echo cancellation,ec[/tags]