Xmodem

1 definition found

From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:

  XMODEM
       
          The "Christensen" file transfer {protocol}, probably the most
          widely available protocol used for file transfer over {serial
          line}s (e.g. between {modem}s).  XMODEM uses 128-byte {packet}s
          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 {modem}s.
          Sending and receiving programs can negotiate to establish the
          best protocol they both support.
       
          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"].
       
          (1995-02-02)