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Glossary
Gigaset N720 DECT IP Multicell System / engbt / A31008-M2314-L101-2-7619 / Glossary.fm / 06.02.2012
Version 2, 06.08.2010
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 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 Codec.
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 Codec.
G.722 is a wideband 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 Codec.
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 Codec.
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 Networks, e.g., a router as an Internet gateway.
For phone calls from VoIP 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 SIP provider.
Global IP address
See IP address.
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