Toshiba V.90 - Manual (Page 52)

AT Commands
AT command formats
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%Cn Data compression control
This command determines the operation of V.42bis and MNP
class 5 data compression. Online changes do not take effect until a
disconnect occurs first.
Result Codes:
-V.90=<n>
This command enables/disables V.90 and changes the
downstream rate.
Possible values of n:
%C0 V.42bis/MNP 5 disabled. No data compression.
%C1 V.42bis/MNP 5 enabled. Data compression enabled (default).
OK n = 0, 1
ERROR Otherwise
-V90=0 Disables V.90
-V90=1 Enables V.90 Auto rate (default value)
-V90=X Controls the downstream rate
-V90? Shows the current value
-V90=? Shows the range [0-21]
“AT-V90=X” Downstream Rate
0 V.90 disabled
1 Auto rate (Default)
2 28000 bps
3 29333 bps
4 30666 bps