US Robotics 56K USB MODEM - Instrucciones de operaciones descargar pdf (Pagina 126)

GLOSSARY

122

V.34

An ITU-T standard that currently allows data

rates as high as 28,800 bps.

V.34+

An enhancement to V.34 that enables data

transfer rates as high as 33,600 bps.

V.42

An ITU-T standard for modem

communications that defines a two-stage

process of detection and negotiation for

LAPM error control.

V.42 bis

An extension of ITU-T V.42 that defines a

specific data compression scheme for use

during V.42 connections.

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.

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US Robotics 56K USB MODEM - Instrucciones de operaciones Pagina 126