> -----Original Message-----
> From: Dipperstein, Michael [mailto:mdippers@HARRIS.COM]
> Sent: Thursday, January 31, 2002 11:27 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [OT]:Anyone with Telephony/Data Communication knowledge,
> plea se enlighten me.
>
>
> >
> > Hi all,
> >
> > I have some questions below: -
>
> [snip]
>
> > 3. Actually the main reason of asking these questions is
> because I am
> > searching for a product which i do not know whether it
> > existed or not, or
> > maybe it does, but in a different form. But basically my
> > requirement are
> > these -
> >
> > There will be a modem like device that can be attached to a
> > normal PSTN
> > line. This device (when necessary) will dial a common number,
> > let say the
> > number 100.
> > Once the connection is established, the device will send a
> > small amount of
> > data ( let say 300 bytes) to the destination server. Once
> > done, the device
> > will automatically put the phone line to 'on hook'
> > again(disconnected).
> > The data are send using the FSK modulation method.
> >
> > That can be easily done, if there is only one line.
> >
> > Now, what if i wanted to do it just like those dial up
> > internet  connection?
> > Meaning, there will be a common number, and there could be 10
> > devices that
> > can be connected simultaneously at any one time. It will be
> > very much like
> > those dial up Internet  with the only difference, there will
> > not be TCP/IP
> > involve. The device will call the number, once connected,
> > dump a 300 bytes
> > data in the form of FSK and then disconnect.
>
> There is a service called Multi-line Hunt Group (or just Hunt
> Group) that gets
> you where you need to go.  If you want to handle 10 calls,
> you set up 10 server
> modems in a hunt group on the same phone number.  A client
> dials the hunt group
> number and it is redirected to one of the server modem lines
> (there are a few
> different styles of hunt groups, with different rules to
> govern which modem line
> will receive the call).
>
> Since hunt groups are a service in the PSTN switch, they
> don't require any
> additional routing equipment to direct the call to an
> available modem.  You just
> need to figure out how to handle 10 calls at once, your phone
> company will make
> sure that the calls get through to you.
>
> -Mike
>
> --

Thanks Mike, but some more question -

1. so if I apply for 10 hunting lines then the phone company will be giving
me physically 10 PSTN line?

2. I believe it is possible to build up a device with 10 modems and a
Controller just to take care of the answering and forwarding of data to a
server. But are there any commercial product available that do this kind of
function?

3. I am still unclear of how a dial up internet is connected the server. I
have tried to read up the product datasheet for Cisco Router 7500 and the
terms there are very intimidating. Needless to say, I understand nothing
from there.

Finally, are there any forum/mailing list on this area of electronics?


Thanks for reading and have a nice day.

Rgds,

Pang

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