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From: David Nebenzahl on 2 Jan 2010 19:20
I know it can be done, but am having trouble making it work.

The idea is to connect 2 PCs directly through their modems. Not cable
modems, ordinary 56K modems. I call it my "Poor Man's Network".

I've found the following pages that describe this operation:

http://phorums.com.au/archive/index.php/t-120530.html
http://www.jagshouse.com/modem.html

That second link suggests powering the connecting line with ~24 VDC, but
I don't think that's actually necessary. (The first link describes
connecting two computeri via modem with no extra hardware needed.)

So when I set this up--2 computeri with connected modems, using
HyperTerminal at each end, with the following commands:

o sending computer: ATX3D
o receiving computer: ATA

I hear stuff through the speaker on the RX end, typical modem connect
tones to start, but I don't hear all that "chirping" usually associated
with dial-up connections; just a steady, low tone that lasts for, say,
30 seconds or so, then the connection goes dead and I get "NO CARRIER"
at both ends.

Everything seems configured correctly: I've set the speed at both ends
to 56K and disabled waiting for dial tone.

So what am I doing wrong here?

Please don't suggest using Ethernet or something else instead. I'm
trying to use what's at hand here.

Thanks for any help.


--
You were wrong, and I'm man enough to admit it.

- a Usenet "apology"
From: Adrian C on 2 Jan 2010 19:37
David Nebenzahl wrote:
>
> Everything seems configured correctly: I've set the speed at both ends
> to 56K and disabled waiting for dial tone.
>
> So what am I doing wrong here?
>

The maximun speed you should set for is 33.6 kbps analogue.

Above that, the communication relies on connection to an ISP's modem
rack port supporting digital network signalling, something that is
missing on your back-to-back attempt.

--
Adrian C
From: David Nebenzahl on 2 Jan 2010 20:37
On 1/2/2010 4:37 PM Adrian C spake thus:

> David Nebenzahl wrote:
>>
>> Everything seems configured correctly: I've set the speed at both ends
>> to 56K and disabled waiting for dial tone.
>>
>> So what am I doing wrong here?
>
> The maximun speed you should set for is 33.6 kbps analogue.
>
> Above that, the communication relies on connection to an ISP's modem
> rack port supporting digital network signalling, something that is
> missing on your back-to-back attempt.

Thanks. I bumped the speed down to 19,200 (I think*); the sounds were
different, but still no success.

Couple questions:

1. Are the sounds one hears on the RX side those of the sending modem,
the RX one or both?

2. * Hard to tell with HyperTerminal what speed is actually being used.
I configured to modem to use a maximum speed of 19,200, but HT still
said "112xxx" (forget the exact #s) until I went and re-configured the
modem, at which time it then said 19200.

This really should work.


--
You were wrong, and I'm man enough to admit it.

- a Usenet "apology"
From: Allodoxaphobia on 2 Jan 2010 23:17
On Sat, 02 Jan 2010 16:20:44 -0800, David Nebenzahl wrote:
> I know it can be done, but am having trouble making it work.
>
> The idea is to connect 2 PCs directly through their modems. Not cable
> modems, ordinary 56K modems. I call it my "Poor Man's Network".

Whoa! This brings back memories! Several hundred years ago -- back in
the DOS 5.0/6.0 and Windows 3.1 days -- we ran The $25 Network in our
SOHO. It used the serial ports on the machines for their connection.
IIRC, the drives on all the other machines appeared as 'extra' drive
letters on each machine, and a common printer could be shared, as well.

I'd be surprised to find that software sourced anywhere... (I might
have it on either a 5 1/4" or 3.5" disk in one of the lower stratums of
a basement closet.)
Then again, this might be that piece of sotware:

http://www.funkymonkey.ie/file-archive.html?func=fileinfo&id=117

Another, undated, web page makes reference to the $25 Network. And,
straining my failing memory, the address listed seems Very Familiar:

http://www.jamesroe.com/astro/$25net.htm

All it took was the DOS-based program and an RS-232 cable you could
cobble up yourself.

gl & hny
Jonesy
--
Marvin L Jones | jonz | W3DHJ | linux
38.24N 104.55W | @ config.com | Jonesy | OS/2
* Killfiling google & XXXXbanter.com: jonz.net/ng.htm
From: Peter Kolbe on 2 Jan 2010 23:53
Needing a Supply Voltage may be necessary depending on the type of modems
you are using.
There are some models that give out enough voltage by themselves, and then
there are others that need the extra boost.

Here is a good link for what u are trying to do (it refers to linking a fax
and modem, but will work the same for 2 modems
http://www.epanorama.net/documents/telecom/fax_to_modem.html


Regards
Peter



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