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xmodem n. 調制解調器的通訊協議之一 ; 文件傳輸通信協議 調制解調器的通訊協議之一 ; 文件傳輸通信協議 {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 data block portion of a packet. Chuck Forsberg improved upon XMODEM by developing {YMODEM} and {ZMODEM}. [Chuck Forsberg, "XMODEM/YMODEM Protocol Reference"]. (2005-09-16)
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