释义 |
Ymodem
YMODEMA file transfer protocol used between modems. YMODEM wasdeveloped by Chuck Forsberg as the successor to XMODEM andwas itself succeeded by ZMODEM. XMODEM used 128-bytepackets, YMODEM can also use 1 kilobyte packets. WhereasYMODEM is a batch protocol, YMODEM-G is a non-stop version.
File sizes are included in the YMODEM header when sending bothbinary and text files. Thus files transferred via YMODEMshould preserve their exact length. File modification timesmay also be present in the YMODEM header.
YModem can fall back to smaller packets when necessary butthere is no backward compatibility with XModem's errordetection.
[Chuck Forsberg, "XMODEM/YMODEM Protocol Reference"].YmodemA file transfer protocol that adds batch file processing to Xmodem. Multiple files can be sent at the same time. It is faster than Xmodem and sends the file name before sending the data. Ymodem-G transmits without acknowledgment when error-free channels or modems with built-in error correction are used, but transmission is cancelled upon any error. |