AddPac VoiceFinder AP2120 Manual de usuario descargar pdf (Pagina 149)

2004 AddPac Solution Guide May 2004

AddPac Technology Proprietary & Documentation 157 - 149

scans the document and the resulting bit stream is then sent to the

receiving machine via telephone line. The transmission and the

reproduction at a distance of still pictures printed matter and similar

documented material

Frame

data that is transmitted between network points as a unit complete

with addressing and necessary protocol control information. A frame is

usually transmitted serial bit by bit and contains a header field and a

trailer field that "frame" the data. (Some control frames contain no

data.)

Frame-Relay

Switching type Data Link Layer Protocol. Using HDLC capsule, process

multi-number of virtual circuits between devices.

FTP

an acronym for File Transfer Protocol, a very common method of

transferring one or more files from one computer to another. Defined at

RFC 959.

FXO

Foreign Exchange Office. An FXO interface connects to the Public

Switched Telephone Network (PSTN) central office and is the interface

offered on a standard telephone.

FXS

Foreign Exchange Station. An FXS interface connects directly to a

standard telephone and supplies ring, voltage, and dial tone.

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.

G.723.1

Describes a compression technique that can be used for compressing

speech or audio signal components at a very low bit rate as part of the

H.324 family of standards. This CODEC has two bit rates associated with

it: 5.3 and 6.3 kbps. The higher bit rate is based on ML-MLQ technology

and provides a somewhat higher quality of sound. The lower bit rate is

based on CELP and provides system designers with additional flexibility.

G.726

Describes ADPCM coding at 40, 32, 24 and 16 kbps. ADPCM encoded

voice can be interchanged between packet voice, PSTN, and PBX

networks if the PBX networks are configured to support ADPCM.

Described in the ITU-T standard in its G-series recommendations.

G.728

Describes a 16 kbps low-delay variation of CELP voice compression.

CELP voice coding must be translated into a public telephony format

for delivery to or through the PSTN. Described in the ITU-T standard in its

G-series recommendations..

Gatekeeper

The component of an H.323 conferencing system that performs call

address resolution, admission control, and subnet bandwidth

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