BinTec X4000, Руководство пользователя

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X4000 User’s Guide 473
Glossary
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
correspondingly evaluated by the PABX or exchange.
E1/T1 E1: European variant of the 2.048 Mbps
➤➤
ISDN
➤➤
Primary Rate
Interface , which is also called the E1 system.
T1: American variant of the ISDN Primary Rate Interface with 23 basic channels
and one D-channel (1.544 Mbps).
EAZ Terminal Selection Digit
Is only used in the
➤➤
1TR6 system and designates the last digit of an
extension number. It is used for dialing various terminals connected to the ISDN
Basic Rate Interface (e.g. fax). This occurs by attaching one digit between 0 and
9 to the actual ISDN telephone number. In Euro ISDN (DSS1), the complete
extension number,
➤➤
MSN , is transferred instead of the EAZ.
Encapsulation Encapsulation of
➤➤
data packets in a certain protocol for transmitting the
packets over a network that the original protocol does not directly support (e.g.
NetBIOS over TCP/IP).