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Xmodem

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- Xmodem is an error-correcting protocol for modem that was created in 1978 by Ward Christensen and became a de facto standard. Modems that agree on using the Xmodem protocol send data in 128-byte blocks. If a block is received successfully, a positive (ACK) acknowledgement is returned. If an error is detected, a negative (NAK) acknowledgement is returned and the block is resent. Xmodem uses the checksum method of error checking.

See modem error-correcting protocols for a comparison with other error-correcting protocols.

CONTRIBUTORS:	Paulo Julio Achoa Mello
LAST UPDATED:	16 Apr 2007

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