Data compression
A process for reducing the amount of data transmitted. This enables
higher throughput to be achieved in the same transmission time. Ex-
amples of this technique include STAC, VJHC and MPPC.
Data Link Layer
(DLL)
Data packet
A data packet is used for information transfer. Each data packet
contains a prescribed number of characters (information and control
characters).
Data transmission
rate
The data transmission rate specifies the number of information units
for each time interval transferred between sender and recipient.
Datagram
A self-contained data packet that is forwarded in the network with
minimum protocol overhead and without an acknowledgement
mechanism.
Datex-J
Abbreviation for Data Exchange Jedermann, the T-Online access
platform. Local dial-in node in every local network. Some German
cities offer additional high-speed access over T-Net/T-Net-ISDN.
Day/Night option
If you want to transfer important calls made after office hours to your
home office to an answering machine, so that you are not disturbed,
you can use call assignment. You can allocate each subscriber two
different call allocations (call assignment Day and call assignment
Night). With call assignments, it is also possible to forward the call to
an external subscriber, so that you can be contacted at all times.
With call assignment Day/Night, therefore, you define which internal
terminals are to ring in the event of an external call. Call assignment
Day/Night is achieved using a table in which all the incoming calls
are assigned to internal subscribers.
Day/Night/Calendar
You define switching of call variant Day/Night.
DCE
Data Circuit-Terminating Equipment
DCN
Data communications network
DECT
Digital European Cordless Telecommunication. European standard
for wireless telephones and wireless PBXs. Internal calls can be
made free of charge between several handheld units. Another ad-
vantage is the higher degree of interception protection (GAP).
Default gateway
Describes the address of the gateway to which all traffic not
destined for its own network is sent.
Denial-Of-Service At-
A Denial-of-Service (DoS) attack is an attempt to flood a gateway or
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Glossary
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