Operation Manual

2 All About FRITZ!Card USB

Remote Access Service, Intranet, X.31 etc.

If you would like to use any of these services, please consult

the respective service provider for information on access

conditions and settings.

2.4 FRITZ!Card USB on the ISDN Line

When your ISDN line is installed, the ISDN network operator

first installs an NT (Network Terminator) with two ISDN jacks.

Each of these jacks is an S

interface.

In many cases, one of the NT’s ISDN jacks is used to connect a

PBX with analog extensions, while the second jack is used to

connect a digital device. Existing analog telephone equipment,

such as telephones, cordless phone stations, answering

machines and Group 3 fax machines then can be connected to

the PBX extensions. The various terminal devices can be

addressed by individual MSNs (“Multiple Subscriber Numbers”).

Each ISDN line has at least three MSNs. If your PBX is connected

to one S

jack and your computer’s

ITZ!CarITZ!Car

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d Ud U

d U

SB SB

SB to the other,

then you will need to install additional ISDN jacks for other di-

gital terminal equipment, such as an ISDN telephone (see the

gray area in the following diagram).

Fig. 2 Typical configuration of a point-to-multipoint ISDN line

Analog telephone with

answering machine

ISDN telephone

Fax

Cordless

telephone

ISDN PBX

with analog

extensions

NTNT

PC with

FRITZ!Card USB