Subj : Re: BBSing opportunties
To   : McDoob
From : Vk3jed
Date : Sun Dec 19 2021 07:34 pm

-=> On 12-18-21 23:11, McDoob wrote to Avon <=-

 Av> How best to get packets around a country or between countries without an
 Av> Internet to carry them? <-- open question for anyone really...
 Av>

 Mc> First thing that comes to mind is packet radio. Hams have been using
 Mc> this protocol since 1980.

 Mc> https://en.wikipedia.org/wiki/Packet_radio
 Mc> https://en.wikipedia.org/wiki/AMPRNet

Effective throughput on a good (uncongested) channel is < 600 bps.  But on real
networks, "hidden station" issues really kill performance.  But IPv4 can run
over packet.

 Mc> Naturally, such a method of transmission would be severely
 Mc> rate-limited, on the order of 10 kbit/s or less (less than 20% of the

Actually a LOT less.  9600bps links often don't perform a lot better than
1200bps, because at 9600, issues like linkm turnaround time really kill
throughput.  Running point to point full duplex links will definitely help
this, along with large window sizes at the transport layer.

But for lonjg haul, you're down to KF, where you may get 100bps through on a
GOOD day and it goes downhill from there. ;)


.... It's a can of worms full of Pandora's boxes.
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