Zmodem protocol definition

Contributor(s): Paulo Julio Achoa Mello

Zmodem is an error-correcting protocol for modems. Modems that agree on using the Zmodem protocol send data in 512-byte blocks. If a block arrives and an error is detected, a "NAK" (negative acknowledgement) is returned and the block is resent.

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

This was first published in April 2007

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