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Appendix C Glossary and Acronyms

SIP Session Initiation Protocol

An IETF standard for setting up sessions between one or more clients. It

is currently the leading signaling protocol for Voice over IP, gradually

replacing H.323.

A dedicated digital carrier facility which transmits up to 24 voice

channels (DS0s) and transmits data at 1.544 Mbps. Commonly used to

carry traffic to and from private business networks and ISPs.

A dedicated digital carrier facility which consists of 28 T1 lines and

transmits data at 44.736 Mbps. Equivalent to 672 voice channels (DS0s).

TDM Time Division Multiplexer

A device that supports simultaneous transmission of multiple data streams

into a single high-speed data stream. TDM combines signals by

interleaving bits one after the other.

TE Terminal Equipment

A device that is established as a point of termination of a communications

circuit or channel. Terminal equipment comprises all customer premises

equipment (CPE). TE devices are connected to NT devices.

telco

A generic name which refers to the telephone companies throughout the

world, including RBOCs, LECs, and PTTs.

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Digium TE820 User Manual Page 74