INSYS Modem 336 LL 2D/4D 5.x Originate / Answer
Functions
12.4
Data Compression
The INSYS Modem 336 LL 2D/4D 5.x Originate / Answer supports various data compres-
sion types. During the connection setup, it will automatically detect the type of data
compression used by the remote terminal, or it is set to a certain type of data compres-
sion. Data compression is only available for error corrected connections. To be able to use
data compression, both sides (sender and recipient) must be able to at least recognize
and support the same data compression mode.
The default setting is the automatic selection of MNP5 and V42.bis and V.44 data com-
pression (
AT%C3
).
Configuration with AT commands
To select the compression type, use:
AT%C<n>
To completely switch off the compression, use
the following commands:
AT%C0
AT+DS44=0
To select the MNP4 compression:
AT%C1
To select the V42bis and V.44 data compres-
sion if they are switched on (see below):
AT%C2
To select the V42bis and MNP5 data compres-
sion if V42.bis compression is switched on (see
below):
AT%C3
To switch on V.42bis compression:
AT%C2
To switch on V.44 compression:
AT+DS44=3
To switch off V.42bis compression:
AT%C0
To switch off V.44 compression:
AT+DS44=0
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