[SGVLUG] 56kbps over cable phone?

[Joshua Haglund]

Interesting topic, here's an article:

http://eetimes.com/electronics-news/4138167/MoIP-Making-PSTN-Modems-Work-on-IP-Networks



On Sun, Dec 2, 2012 at 7:08 PM, Christopher Smith <cbsmith at gmail.com> wrote:

> So, it's kind of a weird case, because technically VoIP can allow for more
> bandwidth than a regular phone line, but in practice all the voice
> compression algorithms are designed to get you well below the bandwidth of
> a regular phone line. Add in the timing issues from buffering... ick.
>
>
> On Sun, Dec 2, 2012 at 5:59 PM, Dan Kegel <dank at kegel.com> wrote:
>
>> I'll go out on a limb and predict that you'll get at most
>> 28Kbps regardless of whether you use a real POTS line.
>> To get 56Kbps, you have to have an ISDN-like connection
>> on the server side, otherwise you run into Shannon's limit.
>> See http://en.wikipedia.org/wiki/56_kbit/s_modem
>> - Dan
>>
>> On Sun, Dec 2, 2012 at 5:51 PM, Jess Bermudes <jbermudes at gmail.com>
>> wrote:
>> > I've never had phone service through a cable company. Do the phones
>> plug in
>> > to some special box that hooks up to the cable system via coax?
>> >
>> > Perhaps you can do an experiment and try to sign up for netzero or some
>> > other dialup ISP to see if your modem signals can travel over the line?
>> >
>> >
>> >
>> > On Sun, Dec 2, 2012 at 5:34 PM, Christopher Smith <cbsmith at gmail.com>
>> wrote:
>> >>
>> >> I have no idea if it'd work, but it'd be funny as all get out to try.
>> My
>> >> bet is it works but not nearly at 56kbps. I'd try to get one of the
>> cheapest
>> >> phone lines the phone company offers instead.
>> >>
>> >> --Chris
>> >>
>> >> On Dec 2, 2012, at 5:24 PM, Braddock Gaskill <braddock at braddock.com>
>> >> wrote:
>> >>
>> >> >
>> >> > On Sun, 2 Dec 2012 17:20:36 -0800, Jess Bermudes <
>> jbermudes at gmail.com>
>> >> > wrote:
>> >> >> You want a POTS line specifically to only use for a 56k connection
>> to
>> >> > the
>> >> >> internet?
>> >> >
>> >> > I was thinking of setting up a dial-up bbs.
>> >> >
>> >> > -braddock
>> >> >
>> >> >>
>> >> >>
>> >> >> On Sun, Dec 2, 2012 at 5:18 PM, Braddock Gaskill
>> >> >> <braddock at braddock.com>wrote:
>> >> >>
>> >> >>>
>> >> >>> Does a 56kbps analog modem have any hope of traversing a Time
>> Warner
>> >> >>> Cable
>> >> >>>
>> >> >>> (voip?) phone line?
>> >> >>>
>> >> >>>
>> >> >>>
>> >> >>> If not, what is the cheapest way to get an old fashioned hard POTS
>> >> > line?
>> >> >>>
>> >> >>>
>> >> >>>
>> >> >>> -braddock
>> >> >
>> >>
>> >
>>
>>
>
>
> --
> Chris
>
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