DSL/xDSL Digital Subscriber Line
DSS1 Digital Subscriber Signalling System
DSSS Direct Sequence Spread Spectrum is a wireless technology that was
originally developed for the military and offers a high level of protec-
tion against faults because the wanted signal is spread over a wide
area. The signal is spread by means of a spread sequence or chip-
ping code consisting of 11 chips across 22 MHz. Even if there is a
fault on one or more of the chips during transfer, the information can
still be obtained reliably from the remaining chips.
DTE Data Terminal Equipment
DTMF Dual Tone Multi Frequency (tone dialling system)
Dynamic IP address In contrast to a static IP address, a dynamic IP address is assigned
temporarily by DHCP. Network components such as the web server
or printer usually have static IP address, while clients such as note-
books or workstations usually have dynamic IP addresses.
E1/T1 E1: European variant of the 2.048 mbps ISDN Primary Rate Inter-
face, which is also called the E1 system.
ECB Electronic Code Book mode
ECT Explicit Call Transfer. This performance feature allows two external
connections to be transferred without blocking the two B channels of
the exchange connection.
Email Electronic mail
Emergency numbers You urgently need to contact the policy, fire brigade or another tele-
phone number. To make things worse, all the connections are busy.
However, you have informed your PBX of the telephone numbers
that need to be contactable in an emergency. If you now dial one of
these numbers, it is recognised by the PBX and a B channel of the
T-ISDN is automatically freed up for your emergency call. Emer-
gency calls are not subject to configuration restrictions. If "Calling
with prefix plus code number" is set for a a connection, the internal
connection is busy. To make an external call, first dial 0 and then
the required emergency number.
Encapsulation Encapsulation of data packets in a certain protocol for transmitting
the packets over a network that the original protocol does not dir-
ectly support (e.g. NetBIOS over TCP/IP).
Funkwerk Enterprise Communications GmbH
Glossary
bintec W1002/W1002n/W2002/WIx040/WIx065 391
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