How Fritz!Card Works; Fritz!Card At An Isdn Connection - AVM FRITZ!Card PCI Manual

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3.1 FRITZ!Card at an ISDN Connection

W
ARD
Before starting FRITZ!Card operation, this chapter offers you the
opportunity to learn the basics about FRITZ!Card at an ISDN
connection and how to work with an ISDN-Controller.
If you would like begin immediately your practical experience
with ISDN and Internet, skip to Chapter 4.
When your ISDN connection is installed, your ISDN provider
installs a network terminator (NT) first. A network terminator is
equipped with two ISDN sockets. Each of these ISDN sockets is
an external S interface.
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In most cases, an ISDN PBX with analog extensions is connected
to one ISDN socket of the network terminator and a digital
terminal device like an ISDN-Controller is connected to the se-
cond ISDN socket. Analog terminal devices like telephones,
cordless telephones, answering machines and Group 3 fax
machines are connected to the extensions of the PBX. The
connected devices are addressed through different telephone
numbers. In the jargon of ISDN, these telephone numbers are
called multiple subscriber numbers (MSNs). Each ISDN
connection has several MSNs.
If your PBX is connected to one of the ISDN sockets and your
computer with FRITZ!Card to the other, additional ISDN sockets
are required to connect other ISDN terminal equipment such as
ISDN telephones (see the gray area in the following figure).
ORKS

3 How FRITZ!Card Works

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