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Glossary
S675IP / USA-CAN eng / A31008-xxxx-xxxx-x-xxxx / glossary.fm / 14.05.2009
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8
Fragmentation
Data packets that are too big are split into smaller packets (fragments) before
they are transferred. They are put together again when they reach the recipient
(defragmented).
Full duplex
Data transmission is a mode in which data can be sent and received at the same
time.
G
G.711 a law, G.711 µ law
Standard for a
.
G.711 delivers a very good voice quality that corresponds to that in the ISDN
fixed line. As there is little compression, the necessary bandwidth is around 64
kbit/s per voice connection, but the delay caused by coding/decoding is only
0.125 ms.
"a law" describes the European standard and "µ law" describes the North Amer-
ican/Japanese equivalent.
G.722
Standard for a
.
G.722 is a
broadband
language codec with a bandwidth of 50 Hz to 7 kHz, a
net transmission rate of 64 kbit/s per language connection and integrated
speech pause recognition and comfort noise generation (silence suppression).
G.722 delivers very good voice quality. A higher sampling rate provides clearer
and better voice quality than other codecs and enables a speech tone in High
Definition Sound Performance (HDSP).
G.726
Standard for a
.
G.726 delivers a good voice quality. It is inferior to the quality with codec
G.711
but better than with
G.729
.
G.729A/B
Standard for a
.
The voice quality is more likely to be lower with G.729A/B. As a result of the
high level of compression, the necessary bandwidth is only around 8 kbit/s per
voice connection, but the delay is around 15 ms.
Gateway
Connects two different
, e.g. a router as an Internet gateway.
to the telephone network, a gateway has to be con-
nected to the IP network and the telephone network (gateway/VoIP provider).
It forwards calls from VoIP to the telephone network as required.
Gateway provider
.
Global IP address
.
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