Operation Manual

Functions of the Driver Software
30 FRITZ!Card – 4 How Does Work FRITZ!Card
The following diagram illustrates how the individual compo-
nents of FRITZ!Card interact:
FRITZ!Card functional diagram
Functions of the Driver Software
A basic-rate ISDN line is equipped with three channels: two B
channels and one D channel. The B channels are used for
data transmission such as faxes. The program, e.g., FRITZ!fax
or FRITZ!data, uses the D channel to communicate with the
digital exchange. Among the information transferred via this
channel are connection charges. The driver software
processes the D-channel protocol of the ISDN line and puts
all required B-channel protocols (X.75, HDLC, etc.) at the
disposal of the applications. CAPI 2.0 also provides
SoftCompression X75/V42bis, SoftModem and SoftFax G3.
CAPI SoftCompression X75/V42bis
The driver software for the ISDN-Controller FRITZ!Card USB v2.1
supports data compression as per V.42bis for X.75 connec-
tions in accordance with the CAPI standard. Connection times
and costs can be reduced considerably with this type of data
compression. Data compression is activated or deactivated at
the request of an ISDN application such as FRITZ!data.
COMMON-ISDN-API 2.0
FRITZ!Card USB v2.1
B-channel protocols (digital):
X.75, HDLC transparent,
V.110, V.120, T.90, ISO 8208 (X.25)
AVM
NDIS
WAN
CAPI
Driver
AVM
ISDN
CAPI
Port
Driver
FRITZ!data
FRITZ!fax
FRITZ!fon
CAPI
SoftFax G3
C A P I
CAPI
SoftModem
V32
Online software
Other ISDN software
based on CAPI
CAPI Soft-
Compression
X75/V42bis
FRITZ!web
AVM
ISDN
TAPI
Services
for CAPI
Internet Service Provider
and applications like
Exchange/
Explorer/Browser/Outlook
FCusb-e.book Seite 30 Dienstag, 12. September 2006 3:12 15