Operation Manual

149
Appendix A: About the AVM Mobile ISDN-Controller M1
English
M1, and the AVM ISDN CAPI Port Driver support this
mode.
Fig. 7 Protocol layer model for communication with
analog modems
A.2.2 Group 3 Fax Devices
Group 3 fax software for CAPI 2.0 can be used with the
Mobile ISDN-Controller M1 to connect to any Group 3
fax device.
A.2.3 ISDN Equipment
The Mobile ISDN-Controller M1 supports telefax and
data connections to ISDN lines. Purely digital gateways
(UDI = Unrestricted Digital Information) between GSM
and ISDN make this possible. These services are not yet
provided by all GSM operators in all countries.
In order to bridge the difference in bandwidth (GSM: 9600
bit/s; ISDN: 64000 bit/s), the asynchronous bit rate
adaptation protocol V.110 is used at the ISDN end. For
this reason, not all ISDN devices are capable of such
connections.
FRITZ!
com
CAPI 2.0
B1= 8 (A sy nchr onou s Analog Mod em)
B2=1 (Transparent)
B3=0 (Transparent)
L2R
RLP
Bfa
L2R
Air Transmission
RLP
a/b
PSTN Line
a/b
V.32
Modem
Ap plication
Mobile Station with AVM
Mobile ISDN-Controller M1
Analog Station
Mobile Switching Center
(MSC)
V.32
Dial-Up
Ne tworking
CAPI Port
V.32bis
RS 232
T-Online-
Decoder