Toshiba TECRA A2 manual AT Command, V90=0, V90=1

V.90

*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	V.42 error control and V.42bis data compression
V42	V.42 error control only
NoEC	No error control protocol

AT Command

-V90=*	V.90 Dial Line Rate
	-V90 sets the maximum V.90 downstream that the
	modem attempts to connect.
-V90=0	V.90 disabled
-V90=1	V.90 enabled: automatic speed selection -
	maximum modem speed (default)

User’s Manual E-3