Operation Manual

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Appendix The Applications Interface CAPI 2.0
CAPI SoftCompression X.75/V.42bis
CAPI SoftCompression is a feature of the Controller A1
driver software. Data compression for X.75 connections
according to V.42bis significantly reduces connection
times and costs by increasing transmission rates.
Applications which support the V.42bis standard can
negotiate data compression with the remote site for the
duration of data transmission. In this case, data com-
pression is activated or deactivated at the request of your
ISDN application, e.g. by Connect32. When the driver
software is installed, CAPI SoftCompression X.75/V.42bis
is deactivated by default.
When using older ISDN applications which do not support
data compression, you have the option of switching on
data compression directly in the AVM ISDN Controller
A1 driver. Thus data compression is enabled for all ISDN
connections.
When data compression is activated in the driver, the
program will attempt to negotiate data compression
according to V.42bis for all X.75 connections, indepen-
dent of the CAPI application in use. If the remote partner
does not perform data compression, data will be trans-
mitted without compression. This procedure runs in the
background and is invisibIe to the user.
Once the driver software has been installed, V.42bis data
compression can be activated in Windows 98/95 and
Windows NT using the A1 Setup program. In Windows 3.x
you have the option of activating data compression during
the installation routine.
If your laptop or notebook does not meet the hardware
requirements or if unexpected problems arise when
exchanging data with remote sites without V.42bis capa-
bility, it is advisable to deactivate data compression in
both the driver and the application.
If problems in establishing connections arise, deactivate
data compression.