Operation Manual

8
1 Introduction
faxes, a Vtx terminal for Videotex, etc.). Today all that is
needed is a PC, an ISDN PC adapter and the desired
application software. AVM has played a major role in
bringing about this revolutionary development to com-
bine the power and flexibility of the personal computer
and the ISDN network. ISDN and the appropriate commu-
nications software make the PC truly multifunctional!
1.2 The AVM ISDN-Controller A1
The AVM ISDN-Controller A1 creates the connection
between your PC and the ISDN network.
ISDN
S
0
interface
Controller
software
ISDN telephone or
ISDN fax or
PBX
A1
Figure 1 PC with AVM ISDN-Controller A1
As the illustration shows, the ISDN-Controller is simply
plugged into a free ISA/EISA bus slot in the PC. A cable
supplied with the ISDN-Controller connects the ISDN-
Controller’s S
0
interface to the ISDN line.
The AVM ISDN-Controller A1 handles both B channels
of an ISDN BRI line (2 x 64000 bit/s) simultaneously.
Thanks to its compact dimensions, the A1 is quite
suitable for small computer housings. The AVM ISDN-
Controller A1 is a passive adapter: that is, the card has
no microprocessor of its own. All computing is per-
formed by the PC’s processor.