----- Original Message -----
From: "Brian Candler" <[EMAIL PROTECTED]>
To: "Olivier Krief" <[EMAIL PROTECTED]>
Cc: <asterisk-dev@lists.digium.com>
Sent: Friday, July 28, 2006 3:05 PM
Subject: Re: [asterisk-dev] Routing data modem calls
On Fri, Jul 28, 2006 at 12:49:14PM +0200, Olivier Krief wrote:
In many cases, I noticed (though I didn't experienced) data modems could
simply be replaced by serial-to-ethernet converters plus dialup routers.
What do you think of that ?
That won't work for me:
(1) EPOS terminals may have modems built-in. It would require
modifications
to the terminals to get at the RS232 signals.
I totally agree with you : if you have a built-in modem and no way to use
another communication port (which obviously could be the case with some
terminals), you have find a way to transport modem signals.
(2) The other end (i.e. the bank or whatever) would also need to install
serial-to-ethernet convertors, in addition to their existing modem bank.
Then I would need to install a secure IP link into the bank or whatever,
whereas at the moment all these calls just come in over the PSTN.
I was thinking of this case :
Instead of :
Terminal --- Data Modem ---- PBX ---- PSTN -----Modem Bank ---- Whatever
Use this :
Terminal --- Serial-to-Ethernet ---- LAN ---- Dialup router ---- PSTN ----
Modem Bank ---- Whatever
In the latter situation, you can concentrate several terminals spread on
different locations with a single router (and then cut several TDM lines to
PSTN). And when the other side (i.e. the bank or whatever) moves to IP,
changing the router is enough.
I met this case with legacy Payment Terminals which have a built-in serial
port and a FXO port while new ones (and high end) now have a built-in
Ethernet port.
Regards,
Brian.
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