BinTec X3200, User Manual

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X3200 User’s Guide 399
Glossary
DNS Domain Name System
Each device in a
➤➤
TCP/IP network is usually located by its
➤➤
IP ad-
dress . Because
➤➤
host names are often used in networks to reach different
devices, it is necessary for the associated IP address to be known. This task
can be performed by a Domain Name Server (DNS), which resolves the host
names into IP addresses. Alternatively, name resolution can also take place
over the HOSTS file, which is available on all PCs.
Domain A domain refers to a group of devices in a network, whose host names share a
common suffix, the domain name. Thus, in the
➤➤
Internet , a part of a nam-
ing hierarchy (e.g. bintec.de).
Downstream Data transmission rate from the
➤➤
Internet Service Provider to the client.
DSL/xDSL Digital Subscriber Line
Data transmission technique that enables high transmission rates to be
achieved on normal telephone lines.
The data rate is dependent on the distance to be covered and the quality of the
line and therefore varies.
xDSL is used as a bookmark for the different DSL variants, such as
➤➤
ADSL ,
➤➤
RADSL ,
➤➤
VDSL ,
➤➤
HDSL ,
➤➤
SDSL ,
➤➤
U-ADSL , etc., which are part of the family of DSL techniques.
DSS1 Digital Subscriber Signalling System.
A common D-channel protocol used in the Euro ISDN.
DTE Data Terminal Equipment
Data Terminal Equipment (see
➤➤
V.24 )
DTMF Dual Tone Multi Frequency (tone dialing system)
Dialing method for telephony systems. In this method, pressing a key on the
telephone keypad generates two simultaneous tones, which are corresponding-
ly evaluated by the PABX or exchange.
E1/T1 E1: European variant of the 2.048 Mbps
➤➤
ISDN
➤➤
Primary Rate Inter-
face , which is also called the E1 system.