UKVoIPTalk.com

In message <ftsokn$scd$1@energise.enta.net>, Gordon Henderson
<gordon+usenet@drogon.net> writes[color=blue]
>They went by various names - eg. Livingston Portmonster, or "not
>modems" .... They plumbed into the PSTN via E1 / ISDN30 lines and took
>the data digitally with no intervening analogue conversion stage, other
>than the modem at the customers end. (hence the term "not modem")[/color]
Sort of a Mod without the EM[color=blue]
>They
>did clever DSP type work internally to recreate the original digital
>data out of the digitally encoded analogue data, ran the other end of
>the (usually) PPP link, then presented it as an IP connection out on an
>Ethernet line.
>
>Gordon[/color]

--
Clint Sharp

Clint Sharp <clint@clintsmc.demon.co.uk> wrote:[color=blue]
> In message <ftsokn$scd$1@energise.enta.net>, Gordon Henderson
> <gordon+usenet@drogon.net> writes[color=green]
> >They went by various names - eg. Livingston Portmonster, or "not
> >modems" .... They plumbed into the PSTN via E1 / ISDN30 lines and took
> >the data digitally with no intervening analogue conversion stage, other
> >than the modem at the customers end. (hence the term "not modem")[/color]
> Sort of a Mod without the EM[/color]

That was the sort of thing I was thinking of: after all, I imagine Sipgate
don't have a big bank of analogue lines plugged into thousands of ATAs.
They'll have an E3 or STM-1 feeding into a box with an Ethernet port on the
other side, and data is converted digitally. Assuming all this conversion
was in software (it probably won't be) it'd just be a case of reprogramming
to turn from a VOIP gateway to a 'modem' bank. It's probably harder work to
convert modem tones into PPP than voice samples into VOIP but the I/Os
are the same.

I could buy a box that did the same, the problem being that unlike IP it's
hard for the consumer to get access to the digital PSTN (without renting an
E1 or similar).

Looks like V.150.1 is exactly what I wanted, but I'll have to wait a few
years until it's deployed.

Theo

Theo Markettos <theom+news@chiark.greenend.org.uk> wrote:[color=blue]
> That was the sort of thing I was thinking of: after all, I imagine Sipgate
> don't have a big bank of analogue lines plugged into thousands of ATAs.
> They'll have an E3 or STM-1 feeding into a box with an Ethernet port on the[/color]

Well, probably more like an E1 per box... I was getting myself confused
between the quantity of numbers they issue (lots) and the quantity of
incoming lines (much smaller).

Theo

On Tue, 15 Apr 2008 13:06:38 +0100, Theo Markettos wrote:
[color=blue]
> Theo Markettos <theom+news@chiark.greenend.org.uk> wrote:[color=green]
>> That was the sort of thing I was thinking of: after all, I imagine
>> Sipgate don't have a big bank of analogue lines plugged into thousands
>> of ATAs. They'll have an E3 or STM-1 feeding into a box with an
>> Ethernet port on the[/color]
>
> Well, probably more like an E1 per box... I was getting myself confused
> between the quantity of numbers they issue (lots) and the quantity of
> incoming lines (much smaller).[/color]

I wouldn't go that far. I'd wager they get their incoming calls delivered
over IP by whoever they get their numbers from [eg Magrathea or Gamma].

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Convergence, n: The act of using separate DSL circuits for voice and data