翻訳と辞書
Words near each other
・ xilinx netlist format
・ xilinx, inc.
・ xlib
・ xlisp
・ xls
・ xml
・ xml schema
・ xml template pages
・ xml user-interface language
・ xmm
・ xmodem
・ xmodem-1k
・ xmosaic
・ xms
・ xnf
・ xnf2ver
・ xns
・ xoff
・ xon
・ xon/xoff


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XMODEM : FOLDOC
XMODEM
Ward Christensen's file transfer protocol, probably the most widely available protocol used for file transfer over serial lines (e.g. between modems). XMODEM uses 128-byte packets with error detection, allowing the receiver to request retransmission of a corrupted packet. XModem is fairly slow but reliable.
Several variations have been proposed with increasing packet sizes (e.g. XMODEM-1K) and different error detection (CRC instead of checksum) to take advantage of faster modems. Sending and receiving programs can negotiate to establish the best protocol they both support.
John Mahr wrote the original XMODEM CRC error correction code. This implementation was backward compatible with Christensen's original checksum code. It improved the error detection from 98% to 99.97% and improved the reliability of transmitting binary files.
Standard XMODEM specifies a one-second timeout during the reception of characters in the


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