US Robotics 56K MESSAGE MODEM - QUICK FOR WINDOWS Guía de usuario descargar pdf (Pagina 54)

56K Professional Message Modem50

Xmodem

This is 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

These are standard

ASCII

control

characters

used to tell an intelligent

device to stop/resume transmitting data.

Ymodem

This is 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

Ymodem

, except it includes no 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 Guía de usuario Pagina 54