Re: TI-H: Networking
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Re: TI-H: Networking
>From: Grant Stockly <gussie@alaska.net>
>>SHIVANJJS@aol.com (SHIVANJJS@aol.com) wrote:
>>
>>>i thought it was possible, don't large companys alow their employees
to dial
>>>up to their networks with modems to connect to company resources
>>
>>Yes, they do. But they have digital lines that can support many
>>connections through the same phone number. It works like how you dial
>>into an ISP.
Not always, you can do the same thing with standard analog lines.
>its a phone switching station. Any house can have 50 phones on the
same
>line.
if the owner can pay for it. :)
>Digital lines go into it (I think about 68) and you get analogue phone
>lines on the other side.
Around here (texas) its called DigiLine, a form of ISDN PRI, 23
digital bearer (B) channels, plus two signaling (D) channels.
You can run it directly into a PM3 with up to 48 digital "modems"
and bypass the final D->A conversion (helps to reach that magical
56k line speed).
>Usually you have analogue signals installed to your house, your line
goes
>to the phone utility, then your call is translated to digital signals,
>routed, then changed back into analogue.
Yep. Usually the analog line from your house is routed to a
substation with a few miles of your house, where it may or may
not be converted to digital before being placed on a trunk.
Most calls go through at least 4 A<->D conversions before reaching
their destinations. Many go through as many as 12. The more
A-D conversions a call goes through, the less likely it is that
you will be able to reach high connection rates (56k is not
possable where I live, too many conversions, best is around 34k).
DK
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