Digium TC400B, User Manual

Page: 39 / 44

Appendix B: Glossary and Acronyms
FXO Foreign Exchange Office
Receives the ringing voltage from an FXS device. Outside lines are
connected to the FXO port on your TC400 Series card.
FXS Foreign Exchange Station
Initiates and sends ringing voltage. Phones are connected to the FXS ports
on the TC400 Series card.
G.711
A recommendation by the Telecommunication Standardization Sector
(ITU-T) for an algorithm designed to transmit and receive mulaw PCM
voice and A-law at a digital bit rate of 64 Kbps. This algorithm is used for
digital telephone sets on digital PBX.
G.723.1
A recommendation by the Telecommunication Standardization Sector
(ITU-T) for an algorithm designed to transmit and receive audio over
telephone lines at 6.3 Kbps or 5.3 Kbps.
G.729a
A recommendation by the Telecommunication Standardization Sector
(ITU-T) for an algorithm designed to transmit and receive audio over
telephone lines at 8 Kbps.
H.323
A recommendation by the Telecommunication Standardization Sector
(ITU-T) for multimedia communications over packet-based networks.
Digium, Inc. Page 39