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200 Meridian Digital Telephone IP Adapter Installation and Administration Guide
Glossary Standard 1.1
G
G.711
G.711 is the international standard for encoding telephone audio on a 64 Kbps
channel. It is a pulse code modulation (PCM) scheme operating at an 8 kHz
sample rate, with 8 bits per sample. According to the Nyquist theorem, that
states that a signal must be sampled at twice its highest frequency component,
G.711 can encode frequencies between 0 and 4 kHz. Telcos can select between
two different variants of G.711: A-law and mµ-law. A-law is the standard for
international circuits.
G.726
G.726 is a standard ADPCM algorithm specified by the International
Telecommunication Union (ITU) for reducing the 64 kbps A-Law or mµ-law
logarithmic data of a normal telephone line to 16, 24, 32, or 40 kbps.
G.729
G.729 is a voice compression International Telecommunications Union (ITU)
standard that can be used in a wide range of applications including wireless
communications, digital satellite systems, packetized speech, and digital leased
lines. G.729 provides 8 Kbps bandwidth for compressed speech at toll quality
(equivalent to G.726 32 Kbps ADPCM under clean channel condition).
gateway
A device that functions as a node on two or more networks, forwarding packets
from one network to addresses in the other networks. In a Remote Office
context, the gateway is the device on the network that directs traffic to and from
the Remote Office 9150 unit or RLC.
Gbyte
See gigabyte.
general protection fault
A computer condition that causes a Windows application to crash. GPFs usually
occur when one application attempts to use memory assigned to another
application.
gigabyte
1 073 741 824 bytes. One Gbyte is equal to 1024 Mbytes.