Technical Terms
147
Direct Dialing-In line
ISDN line, to which a telecommunications system with so-
called extension numbers is connected, which can be used to
directly contact a subscriber. In the case of the number
“(0231) 4777-227, “227” is the extension number within a
telecommunications system. An extension number allows
you to dial a specific extension of a telecommunications
system directly via this defined number.
E.164
ITU-T standard for global telephone numbering (country
code, local area code and subscriber number, e.g. +49 (231)
123456-789.
ENUM
t
E
lephone
NU
mber
M
apping
ENUM is an application of the Domain Name System for
converting telephone numbers (in the E.164 format) to Inter-
net addresses. An ENUM registration of a VoIP number
allows calls to be placed directly via the Internet, for
example.
Ethernet
Network for limited local operation (10 m to 10 km) in the
LAN. The individual PCs are connected via a cable network.
Data is transferred within this network at a rate of 10 Mbit/s,
100 Mbit/s or 1 Gbit/s.
FD
Full Duplex (DX, sometimes also FDX, permits simulta-
neous transmission of information in both direction, e. g. in
telephony)
FTP
File Transfer Protocol (Network protocol for file transmis-
sion)
G.711
ITU standard for compression,
here: Audiocodec 64 kbit/s
G.723.1
ITU standard for compression,
here: Audiocodec 5.3 kbit/s and 6.3 kbit/s
GAP
Generic Access Protocol
Standard for DECT Handsets, which allows the communica-
tion between handsets and basis stations of different
manufacturers.
Gateway
A gateway is a system, which connects two different
networks and which can transfer the data in one network to
the other network and vice versa. This means that the physi-
cal networks can be different and the protocols used (e.g. IP
network and ISDN) can also be different.
GSM
Global System for Mobile Communication
Global system for mobile communication
Term
Explanation
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