Funkwerk W1002 User Manual page 232

Glossary
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or flash key.
Connection of ISDN The internal telephone number of the connection, and not the ex-
terminals ternal number (multiple subscriber number) must be entered as the
MSN in the ISDN terminal connected to the internal ISDN bus. See
the user's guide for the ISDN terminals: Enter MSN. Please note
that not all the ISDN terminals available on the market can use the
performance features provided by the PBX via their key interface.
CRC Cyclic Redundancy Check
CTI Computer Telephony Integration. Term for connection between a
PBX and server. CTI enables PBX functions to be controlled and
evaluated by a PC.
D channel Control and signalling channel of an ISDN Basic Rate Interface or
Primary Rate Interface. The D channel has a data transmission rate
of 16 kbps. In addition to the D channel, each ISDN BRI has two B
channels.
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 The data transmission rate specifies the number of information units
rate 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.
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