Re: File transfer protocol for Radio Links
From: Grant Edwards (grante_at_visi.com)
Date: 02/17/05
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Date: 17 Feb 2005 15:09:00 GMT
On 2005-02-17, esamsalah@gmail.com <esamsalah@gmail.com> wrote:
> What is the most suitable file transfer protocol when using
> HF,VHF radio link with a digital modem.
>
> I tried the Zmodem with crash recovery in MS Hyper Terminal to
> transfer relatively small files but the transmission fails at
> the first bad packet
Hyperterminal is a POS. I would blame it before I'd blame the
protocol.
You could try kermit.
> But I should restart the transfer every time
>
> I think that Zmodem is a full duplex protocol and digital
> radio modems operates on a half duplex manner
Not sure why that would matter. As long as Hyperterminal is
configured to operate in half-duplex mode. Of course I'd be
shocked if Hyperterminal actually does work in half-duplex
mode.
> So Zmodem times out waiting ....
There's nothing I can think of in the ZModem protocol that
requires full duplex. It sounds like hyperterminal isn't
properly set up for a half-duplex link (it's quite possible
that it can't be).
--
Grant Edwards grante Yow! I am NOT a nut....
at
visi.com
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