US Robotics 56K MESSAGE MODEM - QUICK FOR WINDOWS Guide de l'utilisateur télécharger pdf (Page 65)

GLOSSARY

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.

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US Robotics 56K MESSAGE MODEM - QUICK FOR WINDOWS Guide de l'utilisateur Page 65