Operation Manual

77
1 Introduction
English
1 Introduction
The AVM Mobile ISDN-Controller M2 permits fax and
data communications over either the fixed ISDN network
or the digital GSM cellular network.
1.1 ISDN, GSM and Mobile ISDN
ISDN is the worldwide digital telecommunications network.
The abbreviation ISDN stands for Integrated Services
Digital Network. ISDN carries voice, data and images at
2 x 64,000 bits per second over an end-to-end digital
connection.
GSM (Global System for Mobile Communication) is a
worldwide standard for digital cellular communications
networks. Development of the GSM standard was closely
modeled after ISDN, especially with regard to the services
provided and the signaling methods used. Thus data and
telefax connections are supported in addition to voice
calls. In Germany, both the D1 and D2 networks offer
telefax and data services.
The technological innovation Mobile ISDN by AVM permits
data communications with digital reliability and speed
between GSM and ISDN terminal equipment. The mobile
link to ISDN is transparent, and carries the usual ISDN
communications protocols. Mobile applications are
supplied with the Common ISDN API (CAPI) application
interface in Version 2.0. The implementation of Mobile
ISDN is documented in international specifications (GSM
API, GSM 07.08).
The AVM Mobile ISDN-Controller M2 combines ISDN
and GSM capabilities in one PC Card: this Controller can
be connected either to a fixed ISDN jack, or to a mobile
telephone.
When the AVM Mobile ISDN-Controller M2 is connected
to the ISDN line, it supports the customary ISDN data
throughput of 64,000 bit/s per B channel. By bundling
the two B channels, 128,000 bit/s connections are
possible. Appropriate ISDN software can be used to send
ISDN
GSM
Mobile ISDN
Controller in ISDN
Operation