ISDN glossary
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ISDN glossary
The ISDN glossary should help you understand the many
new terms and abbreviations relating to ISDN.
basic rate access
This is the ISDN basic rate access. It is the entry-level connection type
in ISDN and offers two B-channels with 64 kBit/s and a control chan-
nel with 16 kBit/s.
B-channel
The basic channel with a maximum transmission speed of 64 kBit/s.
call forwarding
Forward calls to another station.
camp-on
If the line is busy, a connection request is signalled (acoustically or op-
tically) by a camp-on signal.
CAPI
Abbreviation for
C
ommon ISDN
A
pplication
P
rogrammable
I
nterface.
CAPI is a standardised interface between the communication inter-
face and the protocol interface. Any ISDN application programs can
communicate with any ISDN adapter cards via the CAPI.
CCITT
Abbreviation for
C
omité
C
onsultatif
I
nternational
T
élégraphique et
T
éléphonique which is an international consulting body for telegraphy.
The CCITT has changed over to the ITU. It publishes recommenda-
tions which are frequently viewed as standard in the international tel-
ecommunications industry.
D-channel
Control channel, also known as the data channel, which is provided in
the ISDN basic rate access with 16 kBit/s and in the primary rate ac-
cess with 64 kBit/s. It is required in particular for connection setup and
cleardown.
dual-tone multifre-
quency (DTMF)
A signalling method whereby the information is transmitted to the
switching centre in the form of tones with various frequencies.
Euro ISDN
Uniform European ISDN standard introduced at the end of 1993,
which will completely replace the national ISDN protocols in the year
2000.
hold
The "call hold" feature. The non-communicating state of the user put
on hold in the course of a consultation or toggle action.
ISDN
Abbreviation for
I
ntegrated
S
ervice
D
igital
N
etwork. Service-integrat-
ing digital telecommunications network which integrates telecommu-
nications services such as telephone, telefax, data and image trans-
mission in a network.
LED
Light emitting diode. An LED which flashes or lights up to indicate the
status ON of a device or key.
MSN
Abbreviation for
M
ultiple
S
ubscriber
N
umbers; a multiple subscriber
number of the ISDN basic rate access in a multi-device connection.
multi-device connec-
tion
A connection whereby a number of terminals can be operated simul-
taneously on an S
0
bus in point-to-multipoint operation.