Echo Cancellation A technique used with voice circuits to isolate and filter unwanted signal energy which accompanies analog transmissions. An echo canceller does not turn off the voice channel, as stated, but electronically removes unwanted echo, while maintaining a full-duplex channel. An echo suppressor disables the channel in one direction or the other, depending on who is talking. The method, time, circuit, or facility used to exit the network at the call destination. End Office - See Central Office Class 5 Central Office Switch owned and operated by a LEC .
All circuit elements are digital .
No modems are used to convert digital signals to analog at any point. It usually consists of the local loops on each end and an IEC leg in the middle. Users are usually people, but could also be computers, objects, switches or other types of computer systems or communication equipment. Engineering The process or organization responsible for the skillful design, construction, maintenance and enhancement of complex or sophisticated systems of hardware, software, processes, etc. There is a recurring charge rate element for each entrance facility.