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Glossary
94 Voice Gateways System Manual
EMC Electro-Magnetic Compatibility. The capability of equipment or
systems to be used in their intended environment within
designed efficiency levels without causing or receiving
degradation due to unintentional EMI (Electro Magnetic
Interference). EMC generally encompasses all of the
electromagnetic disciplines.
FCC Federal Communications Commission. A U.S. government
agency that supervises, licenses, and controls electronic and
electromagnetic transmission standards.
FSK Frequency Shift Keying: A simple modulation technique that
merges binary data into a carrier. It creates only two changes
in frequency: one for 0, another for 1.
G.711 A 64 Kbps PCM voice-coding technique. Described in the ITU-T
standard in its G-series recommendations.
G.729 A compression technique where voice is coded into 8 Kbps
streams. There are two variations of this standard (G.729 and
G.729 Annex A) that differ mainly in computational complexity;
both provide speech quality similar to 32-kbps ADPCM.
Described in the ITU-T standard in its G-series
recommendations.
H.225 An ITU standard protocol for control signaling in an H.323
audio or video environment. H.225 uses messages defined in
H.245 to establish the call over the Registration, Admission
and Signaling (RAS) channel.
H.245 An ITU standard protocol for control messages in an H.225
audio or videoconferencing call. The messages are used for flow
control, encryption and jitter management as well as for
initiating the call, negotiating which features should be used
and terminating the call. It also determines which side is the
master for issuing various commands.
H.323 A protocol suite defined by ITU-T for voice transmission over
internet (Voice over IP or VoIP). In addition to voice
applications, H.323 provides mechanisms for video
communication and data collaboration, in combination with
the ITU-T T.120 series standards.
HA High Availability.