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Ymodem Definition
DocumentID: 655901
Revision Date: 29-Feb-96 8:29:39 PM

The information in this document applies to:
WordPerfect® 5.1 for DOS

Problem

Solutions: Ymodem: As a file transfer protocol, the Ymodem protocol was first released as part of Chuck Forsberg's program YAM ("Yet Another Modem"). Ymodem is actually an extension to Xmodem, to overcome some of the limitations of Xmodem. Ymodem allows information pertaining to the transmitted file to be sent along with the data, such as filename and length. Ymodem also increases the size of the Xmodem block from 128 to 1,024 bytes and adds the capability to transmit "batches" of files. In fact, Ymodem is sometimes referred to as Xmodem-1K, and vice versa. YmodemG is a streaming protocol built around the philosophy that no news is good news. It sends the entire file before waiting for an acknowledgement. If the receiving side detects an error in mid- stream, it aborts the transfer. YmodemG is not an error correcting protocol; it is designed for use with high-speed modems, which have built-in error-correcting protocols.

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