Toshiba SATELLITE PRO L300D - Manual (Page 164)

User’s Manual C-3
V.90/V.92
AT Command
V42bis V.42 error control and V.42bis data compression
V42 V.42 error control only
NoEC No error control protocol
-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)