Matrix SETU VFX44L, System Manual

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182 SETU VFX88L
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VFX44L V1
System Manual
Appendix B: Glossary
CELP
It is the Code Excited Linear Prediction compression. It is the
compression algorithm used in low bit-rate voice encoding. Used in
ITU-T Recommendations G.728, G.729, G.723.
DHCP
It is the Dynamic Host Configuration Protocol. It provides a
mechanism for allocating IP addresses dynamically so that addresses
can be reused when hosts no longer need them.
DNS
It is the Domain Name System. System used on the Internet for
translating names of network nodes into addresses.
FTP
File Transfer Protocol - A protocol used to transfer files over a TCP/IP
network.
FXS
It is Foreign Exchange Station. An FXS interface connects directly to a
standard telephone and supplies ring, voltage, and dial tone. Matrix-
Gateway’s FXS interface is an RJ-11 connector that allows
connections to basic telephone service equipment and PBXs.
G.711
Describes the 64-kbps PCM voice coding technique. In G.711,
encoded voice is already in the correct format for digital voice delivery
in the PSTN or through PBXs. Described in the ITU-T standard in its
G-series recommendations.
G.723
It is an ITU standard for speech codecs that uses the ADPCM method
and provides toll quality audio of 20 and 40 Kbps.
G.729
Describes CELP compression where voice is coded into 8-kbps