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%C Data compression
Commands:
%CO0, %C1, %C2,%C3
Compression is used to increase the effective transfer speed
over the line. This commands selects whether to use data
compression or not.
AT%COptal
a
Compression off (MNP5 and V 42 bis).
When compression is disabled, the modem will be restricted to
use:
MNP Level 4 or lower.
or LAPM.
AT%C1 pt
us
Compression enabled.
AT%C2 pl
<1
Compression of transmitted data (V.42bis).
AT% C3]
~ | Compression of received data. (V.42 bis).
If running MNP and transferring precompressed files there will
be a degradation of the transfer speed when using the MNP5
compression scheme. V.42 bis will not have this degradation
since it turns itself on/off dynamically depending on the
compressibility of the transferred data.
When MNP is active, the commands %C2 and %C3 operate as
%C1.
See chapter 9 for more information.
Speed-Conversion
Commands: +C0, +C1
Determines whether to allow speed differences between
communication towards DTE and the fine via the modem.
AT+C1 el
Speed difference is allowed.
LZTR104006 R1.00
3-9
Zat 14.4/14.4-7 and Zat 19.2/19.2-7
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