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PA2AGA > TCPDIG 29.08.96 01:18l 163 Lines 6903 Bytes #-10905 (0) @ EU
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Subj: TCP-Group Digest 96/173B
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From: pa2aga
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Subject: TCP-Group Digest 96/173B
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> available. I think the PI2 cards are reaching the end of production
> according to the web page.
I don't see much point in using a dedicated embedded controller when a 386 PC
is almost free. If it takes more than $50 to get a 386(something) CPU, 4 meg
of memory, case, PS, etc, you're not looking hard enough. Ethernet cards are
$5 a piece for the level of performance a packet switch is going to need.
>
> 1. Software (drivers)
> 2. 56k Modem
> 3. DMA card
> 4. Ethernet card
> 5. CPU card (or use the PC)
> 6. Passive backplane (or an obsolete 386)
> 7. Transverter
> 8. Primary/Secondary HDPLX frequency plan (xtals)
> 9 Primary/Secondary FDPLX frequency plan (xtals)
> 10. Antenna
>
> The idea in a project like this is to make a single frequency popular,
> and then be able to switch easily to a secondary when it get's crowded
> (uh huh). Sort of like 145.01 really sucked them in. Items 8, 9, 10
> are probably already well known in Georgia. Most people have 4. To
> package a product really requires 1, 2, 3, 7, 8, 9, 10. With 4, 5, 6
> being optional. What most Hams enjoy is getting a box on the porch,
> string some coax into the yard, stick a pole in the ground and hang
> the antenna :-) Then next week after seeing if it all works, clean it
> up and hang it on the roof or tower...
1, 4, 5, (6), and 10 are pretty much free or trivial. Most of the cost is
associated with 2 and 7. A cost reduced version of the WA4DSY modem is fairly
easily designed and should be quite cheap. If we can get someone to produce a
good number of transverters at a low cost, we're in. (3) can be a simple
85c30
on an ISA card.
Cheers,
David
------------------------------
Date: Mon, 26 Aug 1996 17:37:49 -0400
From: Barry McLarnon <barry.mclarnon@crc.doc.ca>
Subject: advanced networking
Dennis Rosenauer writes:
>We are running a 56K network up here. 56K goes into the shack!
>We have encountered all the problems that are being talked about here.
>There is no solution but to go out an do something about it. Griping
>about it doesn't get anything done. Yes you have to spend some money,
>it is still a pretty cheap hobby compared to drag racing, sailboats, etc.
>
>56K isn't all that expensive, if you look at some of the HF types
>around here you will find thousands of dollars of ham gear in the shack.
>A nominal HF transceiver will set you back $1000 easily these days.
>Go to any swap meet and you will find lots of hams with $500 handhelds
>strapped to their belt as a form of status symbol.
>
>To solve some of the problems mentioned we did the following:
[Lots of good stuff deleted]
Dennis neglected to mention that he and I are the ringleaders behind a
3-hour workshop on 56K, being held in conjunction with the ARRL/TAPR
Digital Communications Conference in Seattle next month (Sept 21-22...
workshop's on the 22nd). If you want to see the hardware and talk to folks
who've 'been there, done that', try to get to the DCC this year...
Barry
--
Barry McLarnon VE3JF/VA3TCP | Radio Broadcast Transmission
Email: barry.mclarnon@crc.doc.ca | Communications Research Center
WWW: http://www.crc.doc.ca/crchome.html | Ottawa, Ontario, Canada
------------------------------
Date: Mon, 26 Aug 1996 11:47:05 -0700 (MST)
From: Shawn Rutledge <ecloud@goodnet.com>
Subject: advanced networking
All this talk about dedicated routers... My first instinct is I hate to
waste a whole pc on just one task like that. And it will cost $1000 or more
by the time you get the ethernet card, mobo, ram, disk, GRAPES, transverter...
What I'd like to see is a GRAPES-like card that doesn't require a separate
PI card. It should plug into the ISA bus and pretend to be a serial port
(but have other IRQ selections for those of us that actually use both our
serial ports). It should have a BNC on the back into which you plug your
transverter (or perhaps two BNC's - separate xmit and receive). There should
also be an external version of this that plugs into a serial port. These days
most all computers are fast enough to keep up with port I/O at 115K and not
waste too great a percentage of CPU time doing it; 16550's help a lot too, and
most people have them. The DMA thing is not really necessary anymore, and so
I
think we should get away from the proprietary PI card and go with normal
serial
I/O. We will need to reinvent things again at higher speeds anyway... the
next generation for 2mbps or whatever should be PCI.
By cheapening and standardizing the "modem" the users can do whatever they
want - make a dedicated router iff they really need that kind of horsepower,
or plug it into their Windows PC and run it like a modem if not.
For the ultimate plug-and-play solution the external serial modem could have
the transverter built in too. One box - plug into computer, plug into
antenna, install CD-ROM (which comes with Windows, Mac and Linux versions)
and get going.
--
_______ KB7PWD @ KC7Y.AZ.US.NOAM ecloud@goodnet.com
(_ | |_) Shawn T. Rutledge on the web: http://www.goodnet.com/~ecloud
__) | | \__________________________________________________________________
* packet * Star Trek * VRML * OO * X window * freedom of information *
------------------------------
Date: Tue, 27 Aug 1996 08:26:07 +1000
From: Terry Dawson <terry@perf.no.itg.telstra.com.au>
Subject: advanced networking
> > I've successfully built a single 1.44Mb floppy disk that was bootable
> > that contained enough to boot linux and act as a router with ethernet,
> > ax25, netrom and ppp support, and supported firewalling, masquerade
> > etc as well. It requires 4Mb of ram in the machine, but the rest is
> > easy.
>
> Surely the normal reason for a reboot in a remote environment is power
> failure. Given that, a power failure would normally be a result of some
> unusual weather conditions.
>
> In that instance, the dramatic temperature changes would not suggest
> that a bootable floppy would fare well in the long term.
Graham,
my point was not that this would be a suitable arrangement for a
mountain
top router/repeater, but that it takes quite minimal resource to get a
working linux configuration running. I see little reason why one of
To be continued in digest: tcp_96_173C
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