Digium TC400B, User Manual

Page: 41 / 44

Appendix B: Glossary and Acronyms
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.
PBX private branch exchange
A smaller version of a phone company’s large central switching office.
Example: Asterisk.
PCI peripheral component interconnect
A standard bus used in most computers to connect peripheral devices.
POP point of presence
The physical connection point between a network and a telephone
network. A POP is usually a network node serving as the equivalent of a
CO to a network service provider or an interexchange carrier.
Digium, Inc. Page 41