Digium TDM400P, User Manual

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Page 68 Digium, Inc. Release 1.0
Appendix E: Glossary and Acronyms
ISO International Standards Organization
LED light-emitting diode
Linux
A robust, feature-packed open source operating system based on Unix
that remains freely available on the internet. It boasts dependability and
offers a wide range of compatibility with hardware and software. Asterisk
runs exclusively on Linux.
loopback
A state in which the transmit signal is reversed back as the receive signal,
typically by a far-end network element.
MGCP Media Gateway Control Protocol
multiplexing
Transmitting multiple signals over a single line or channel. FDM
(frequency division multiplexing) and TDM (time division multiplexing)
are the two most common methods. FDM separates signals by dividing
the data onto different carrier frequencies, and TDM separates signals by
interleaving bits one after the other.
MUX multiplexer
A device which transmits multiple signals over a single communications
line or channel. See multiplexing.