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Y-Modem is a character-oriented communication protocol for secure file transfer. In contrast to the predecessor protocol X-Modem, Y-Modem works with automatic block length adaptation, whereby the block length

changes depending on the transmission quality. As with the more powerful variant of X-Modem (X-Modem 1K), the block length is 1024 bytes

. The Y-Modem protocol was used in the 1980s as a transfer protocol between mailboxes and personal computers. It was used to transfer file names and attributes, allowing the simultaneous transfer of multiple files. The Y modem was later replaced by the Z modem.

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Englisch: Ymodem
Updated at: 29.10.2011
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