david@quad1.quad.com (David A. Fox) (08/14/87)
I wonder if anyone can help me figure something out.
We are the "proud" owners of an NEC neax, which is some sort of PBX or
something. We use it for all our voice telephony, as well as to do all
our RS-232 switching within our offices.
We make our outgoing modem calls through this thing. This allows us to
effectively steal trunk lines from voice use, so that our dedicated
data lines can be used only as dial-up lines. Also, we can share
outgoing modems between systems. This is helpful, since I have one
modem and 3 or 4 machines wanting to use it.
Here's my simple problem: In order to make an outgoing modem call, our
computers tell the PBX what number to dial. When the connection is
made, the PBX connects the outgoing truck line it used to the modem,
and waits for the modem to detect carrier and bring up DCD. It then
connects the modem to whichever system was placing the call.
This is neat, except, as you will note, the modem has to pretend that
it is placing the call even though it is actually answering it. I am
lucky in that we just happened to have an older-style 1200 baud modem
that has *many* switches inside of it -- One switch happened to be
called "Force originate mode on answer". This seems to be just what I
needed. Unfortunately, I only have one. Also, I need some faster
modems, something switchable between 2400-9600 baud would be nice.
None of the modem literature I have found mentions an ability to answer
in originate mode, although some modems seem to be able to originate in
answer mode.
I have two questions:
1. Is this switch setting actually necessary, or will modern modems hear
each other squealing and manage to connect anyway?
2. If it is necessary, can anyone recommend any modems that will do
what I need?
Any advice shall be greatly appreciated.
--
David A. Fox Quadratron Systems Inc.
Inet: david@quad.com
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