At Command - Toshiba TECRA S5 User Manual

* EC stands for the Error Control method, which appears only when the
extended result codes configuration option is enabled. EC is replaced by
one of the following symbols, depending on the error control method
used.
V42bis
V42
NoEC

AT Command

-V90=*
-V90=0
-V90=1
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V.42 error control and V.42bis data compression
V.42 error control only
No error control protocol
V.90 Dial Line Rate
-V90 sets the maximum V.90 downstream that the
modem attempts to connect.
V.90 disabled
V.90 enabled: automatic speed selection - maximum
modem speed (default)
V.90
E-3