USRobotics V.34 user manual Xon/Xoff

COURIER HIGH SPEED MODEMS

V.34

An ITU-Tstandard that allows data rates as high as 28.8K bps.

V.42

An ITU-Tstandard for modem communications that defines a two-stage process of detection and negotiation for LAPM error control.

V.42 bis

An extension of ITU-TV.42 that defines a specific data com- pression scheme for use with V.42 error control. V.42 bis is only supported with LAPM and HST.

V.8

ITU-Trecommendation that defines procedures for starting and ending sessions of data transmission.

V.Fast Class (V.FC)

Proprietary modulation scheme developed by Rockwell International for data communication speeds up to 28.8K bps.

Word Length

The number of bits in a data character without parity, start or stop bits.

Xmodem

The first of a family of error control software protocols used to transfer files between modems. These protocols are in the public domain and are available from many bulletin board services.

XON/XOFF

Standard ASCII control characters used to tell an intelligent device to stop/resume transmitting data. In most systems typing <Ctrl>-S sends the XOFF character. Some devices, including the Courier, understand <Ctrl>-Q as XON; others interpret the pressing of any key after <Ctrl>-S as XON.

Glossary J-15