Re: Multiple modems configuration in Linux
klam_at_vcn.bc.ca
Date: 09/20/03
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Date: Sat, 20 Sep 2003 23:11:06 +0800
Thank you for your kind input, I think you explain clearly to me about
different options. In fact, I consider using a multi-modem card as the first
preference, but as you said it seems quite expensive. I believe using PnP
internal modems seems to be the most cost effective.
"Nico Kadel-Garcia" <nkadel@verizon.net> wrote in message
news:sBC9b.5456$U41.3265@nwrdny01.gnilink.net...
> klam@vcn.bc.ca wrote:
>
> > Hi All,
> >
> > Just want to seek for any recommendations for using multiple modem
> > configuration in Linux (currently using Redhat 7.2, may consider
migrarte to
> > 9.0). I'm going to install 4 modem lines connected to the Linux system
> > (using the vgetty package on a voice application). I'm thinking about
the
> > following different possibilities:
>
> I'd use HylaFAX, at www.hylafax.org. The modem configurations are better
> maintained and so far as I know, it gets used more in industrial grade
> environments.
>
> > 1. Use the 2 com ports on the PC to connect to 2 external modems and add
2
> > internal modems (I believe most modems can be configured as COM3 and
COM4).
>
> That won't work. COM3 and COM4 use the same IRQ's as COM1 and COM2, via
> an extremely confusing and often irritating signal splitting scheme. You
> need another serial card, perhaps a Rocketport 8-port serial card, or
> another couple of PCI modems. I'd actually recommend grabbing the
> Rocketport and using similar if not identical external modems, to avoid
> having to deal with those !@#$ Winmodems.
>
> > 2. Buy a port extender card (which can have 2 upto 8 more COM. ports),
then
> > connect all the COM ports to external modems.
>
> This is pretty well guaranteed to work.
>
> > 3. Buy a multiple modem card (some cards can have 4 to 8 modems on one
> > single card).
>
> Yeah, although these are often quite expensive.
>
> > 4. Buy 4 different internal modem cards (I'm not sure if its possible to
use
> > them as COM1 to COM4 ?)
>
> Maybe, their IRQ's will be assigned depending on their jumpers, any PNP
> settings, etc. They'll show up as /dev/tty* devices on a modern Linux
> kernel.
>
> > 5. Or any other combination ???
>
> Two el cheap throwaway computers both running HylaFAX or vgetty with a
> pair of modems each. I've done this, rather than buy hardware.
>
> > Could anybody share any experience? What types of modems cards
(especially
> > for multiport modem card) or extender card are recommended, since I want
to
> > make sure that the Linux and vgetty driver can support them. Thanks in
> > advance.
>
> Rocketport has a very, very good name. I've used the ECPA expanders and
> not been real thrilled with them: whoever packaged their kernel driver
> tools should have been shot.
>
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