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Xmodem - Dictionary Definition and Overview |
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Xmodem :
The "Christensen" 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
XMODEM-1K)_and_different_error_detection_({CRC">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.
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)
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