Operation Manual

Functions of the Driver Software
38 FRITZ!Card PCI – 5 How FRITZ!Card PCI Works
The following diagram illustrates how the individual compo-
nents of FRITZ!Card PCI interact:
Functional diagram of FRITZ!Card PCI
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 da-
ta transmission such as faxes. The program, e.g., FRITZ!fax or
FRITZ!data, uses the D channel to communicate with the dig-
ital exchange. Among the information transferred via this
channel are connection charges. The driver software pro-
cesses the D-channel protocol of the ISDN line and puts all
required B-channel protocols (X.75, HDLC, etc.) at the dispos-
al of the applications. CAPI 2.0 also provides SoftCompres-
sion X75/V42bis, SoftModem and SoftFax G3.
COMMON-ISDN-API 2.0
FRITZ!Card PCI
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