Simulated telephone - test-drb@ccmp.vtda.org

26 Aug 2010

-----------------Original Message:
Date: Wed, 25 Aug 2010 23:16:11 -0700
From: Brent Hilpert <hilpert at cs.ubc.ca>
Subject: Re: Simulated telephone

On 2010 Aug 25, at 9:02 PM, Fred Cisin wrote:

...
  On Tue, 24 Aug 2010, Brent Hilpert wrote:
  If both modems in a given connection are older
('80s), lower-speed
 (300-1200/2400) it will likely work by simply connecting them together
 and commanding one off-hook in answer mode (ATA ?), then the other
 off-hook in originate mode (ATD ? ATH1 ?). I have successfully done
 this with particular modems up to 14.4Kbps but might be forgetting the
 commands. 
 Many of my older modems are from BEFORE "Hayes Compatible" became the
 standard for giving commands to the modem. 
Well, I was thinking of adding in that if you have a really old modem
you might have to flip the originate/answer switch appropriately if it
has one, but I think the OP indicated he was dealing with later stuff.

(I have a couple of pre-'smart' modems, too.)

--------------------Reply:
I was going to make the same point; the M100 he mentioned as an example
*does* indeed have an originate/answer switch (as well as a direct
connect/acoustic coupler switch).

I usually don't have any problem just connecting modems together without any
fancy line simulators, etc.

mike