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Glossary
Gigaset A510IP / USA en / A31008-M2230-R301-2-6019 / Glossary.fm / 09.10.2012
V
e
rsion 4, 16.0
9
.2005
Fragmentation
Data packets that are too big are split into smaller packets (fragments) before they are trans-
ferred. They are put together again when they reach the recipient (defragmented).
Full duplex
Data transmission 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 very good voice quality that corresponds to that in the ISDN network. 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 approx. 0.125 ms.
"a law" describes the European standard and "μ law" describes the North American/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 voice 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 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 com-
pression, 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.
For phone calls from
to the telephone network, a gateway has to be connected to the IP
network and the telephone network (gateway/VoIP provider). It forwards calls from VoIP to the
telephone network as required.
Gateway provider
See
.
Global IP address
See