08-26-2007 12:48 AM - edited 03-05-2019 06:06 PM
Hi,
anyone can tell me what is ymodem and zmodem use for ?
thanks a lot.
regards,
skywalker
08-26-2007 04:30 AM
Ymodem and zmodem (and xmodem) were (old) protocols used to transfer files across serial links. Normally found in terminal emulators (e.g. HyperTerminal). Dial-up bulletin board systems (BBS) used them when you wanted to download or upload files. (In days of yore, vendors often had a BBS that you could dial-up and download patches.)
On much (all?) Cisco equipment, you can also upload a software image across the console serial port using one of these.
08-26-2007 04:59 AM
Hi Josephdoherty,
thanks for the update, but i still dont understand if these 3 protocol are used to upload and download then what dont just come with 1 protocol like xmodem is good enough instead of ymodem then zmodem ? doesn't make sense, right ? it must be some usage between these 3 ?
regards,
skywalker
08-26-2007 11:16 AM
Ah, well over time various individuals made protocols that did the same thing, but did it "better" (with these "better" was usually faster and/or better error handling).
The sequence was, I believe, Xmodem, Ymodem, and the Zmodem. Some had variants with the same protocol.
Normally, when you have a choice, you chose the latest or "best" version that both sides support.
08-26-2007 04:27 PM
Hi Josephdoherty,
really thanks a lot, at least now i have some idea what does it use for .
thanks a lot.
regards,
skywalker
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