ZMODEM
Sign in to saveZMODEM is an inline file transfer protocol developed by Chuck Forsberg in 1986, in a project funded by Telenet in order to improve file transfers on their X.25 network. In addition to dramatically improved performance compared to older protocols, ZMODEM offered restartable transfers, auto-start by the sender, an expanded 32-bit CRC, and control character quoting supporting 8-bit clean transfers, allowing it to be used on networks that would not pass control characters.
Key facts
- Networking protocol.title
- ZMODEM
- Networking protocol.purpose
- File transfer
- Networking protocol.developer
- Chuck Forsberg
- Networking protocol.ports
- None
- Networking protocol.hardware
- modems
via Wikipedia infobox
Wikidata facts
Show 1 more fact
- inception
- 1986-00-00
Sources (2)
via Wikidata · CC0
~9 min read
Article
9 sectionsContents
- Improvements
- Older systems
- Windows and streaming
- Restart
- Auto-start
- Variations
- Limitations
- References
- External links
ZMODEM is an inline file transfer protocol developed by Chuck Forsberg in 1986, in a project funded by Telenet in order to improve file transfers on their X.25 network. In addition to dramatically improved performance compared to older protocols, ZMODEM offered restartable transfers, auto-start by the sender, an expanded 32-bit CRC, and control character quoting supporting 8-bit clean transfers, allowing it to be used on networks that would not pass control characters.
In contrast to most transfer protocols developed for bulletin board systems (BBSs), ZMODEM was not directly based on, nor compatible with, the seminal XMODEM. Many variants of XMODEM had been developed in order to address one or more of its shortcomings, and most remained backward compatible and would successfully complete transfers with "classic" XMODEM implementations. This list includes Forsberg's own YMODEM.