User`s guide

GLOSSARY
57
V.42 bis
An extension of ITU-T V.42 that defines a specific
data compression scheme for use during V.42
connections.
V.90
The ITU-T standard for 56 Kbps modem
communications.
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.
Ymodem
An error-checking protocol that can send several
files of data at a time in 1024-byte (1K) blocks.
This protocol can use either checksums or CRC for
error checking.
Ymodem G
This is similar to the Ymodem, except it relies on
the modem for error checking, which makes it
faster.
Zmodem
This is similar to Xmodem and Ymodem, except it
includes batch transfer, the ability to recover from a
partially complete transfer, an autostart feature, and
improved efficiency.