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1 Introduction
1 Introduction
1.1 What is ISDN?
ISDN is the internationally standardized digital telecom-
munications network. The abbreviation ISDN stands for
Integrated Services Digital Network.
ISDN has three important new features that distinguish it
from conventional communications media:
The first is the integration of services. This means that
all public telecommunications services, such as tele-
phony, data communications, telefax, Teletex or video-
tex, are carried over a single data network. Voice, text,
files and even images can be transmitted over ISDN.
Users can connect several different terminals and use all
available services with one ISDN line. Because the ISDN
subscriber access (called a basic-rate interface, or BRI)
provides two user data channels (B channels), two differ-
ent telecommunications services may be used at the
same timeto receive a fax during a telephone conver-
sation, for example.
The second significant difference is the extraordinary
speed of data transmission in ISDN. Voice and data are
transmitted over both of the BRIs B channels at the rate
of 2 x 64000 bits per second. Furthermore, the AVM
ISDN-Controller A1 PCMCIA allows ISDN applications
to bundle the two B channels so that throughput is
doubled.
The third important feature of ISDN is the end-to-end
digital transmission of user data: this is the basis for high
transmission quality. Poor connections, noise and inter-
ference, which can cause transmission errors or interrup-
tions in analog networks, are eliminated. Data commu-
nication over ISDN thus is not only faster, but also more
reliable than in analog networks.
Yet it was the personal computer that opened up the full
potential of ISDN: it used to be that each service required
different terminal equipment (a fax machine to send
Excellent line quality
High speed
Integrated services
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