UKVoIPTalk.com

"harrogate3" <nospam3@ntlworld.com> wrote in message
news:LUAGi.29464$ka7.21918@newsfe4-gui.ntli.net...[color=blue]
>
> "Tim" <nutnews@kooky.org> wrote in message
> news:46ead764$0$654$bed64819@news.gradwell.net...[color=green]
> > harrogate3 wrote:[color=darkred]
> > > I have an application where I need to be able to send audio from A[/color][/color]
> to[color=green][color=darkred]
> > > B about 40 miles apart. There is no audio circuit between the[/color][/color]
> sites[color=green][color=darkred]
> > > but there is a (fairly) high capacity data circuit.
> > >[/color]
> >
> > I would use a pair of Snom370s and connect to the headset ports to[/color]
> get[color=green]
> > your audio.
> >
> > Reason for this is that Snom370 support G.722 wide band audio, so[/color]
> will[color=green]
> > give you the best audio quality.
> >
> > I can't think of a better way of doing it without buying broadcast[/color]
> sound[color=green]
> > style encoders and decoders. Mega bucks.
> >
> >
> > Tim
> >[/color]
>
> Thanks for the reply gents, but I suspect you have misunderstood my
> requirement. I very specifically do NOT want any form of dial-up
> circuit. The line must be end-to-end permanently open - just like a BT
> private wire which would cost a fortune. Presentation should ideally
> be 600R floating or balanced.[/color]

if you have PBXes (or the IP equivalent) then you may be able to program a
fixed link between them - cost approx zero....

"real" IP audio codecs are not cheap (for some definition of cheap of
course) - these are usually stereo (at least) and 15 or 22 KHz audio
channel.

They also tend to eat bandwidth, so you should check how much you are
willing to use.

as an example, you are going to need 400 Kbps+ to get 16 bit sampled stereo
using enhanced APTX compression (which is what a lot of radio broadcasters
seem to use)

[url]www.broadcom.co.uk[/url] is 1 source we have used.

if codecs are a bit steep then esp if you have a typical corporate network,
some cisco router models can take analog speech interfaces - set them up to
do point to point permanent G.711 and you get 3.5 Hkz / 8 bit sampled sound

this could still run out several £100 when you add voice grade feature upgra
des for the routers, voice interfaces and DSPs - but 2nd and more channels
will be cheaper.....[color=blue]
>
> I suppose I really need some form of single line mux.
>
>
> --
> Woody
>
> harrogate3 at ntlworld dot com[/color]
--
Regards

[email]stephen_hope@xyzworld.com[/email] - replace xyz with ntl

"stephen" <stephen_hope@xyzworld.com> wrote in message
news:qNVGi.59294$h11.38866@newsfe7-gui.ntli.net...[color=blue]
> "harrogate3" <nospam3@ntlworld.com> wrote in message
> news:LUAGi.29464$ka7.21918@newsfe4-gui.ntli.net...[color=green]
> >
> > "Tim" <nutnews@kooky.org> wrote in message
> > news:46ead764$0$654$bed64819@news.gradwell.net...[color=darkred]
> > > harrogate3 wrote:
> > > > I have an application where I need to be able to send audio[/color][/color][/color]
from A[color=blue][color=green]
> > to[color=darkred]
> > > > B about 40 miles apart. There is no audio circuit between the[/color]
> > sites[color=darkred]
> > > > but there is a (fairly) high capacity data circuit.
> > > >
> > >
> > > I would use a pair of Snom370s and connect to the headset ports[/color][/color][/color]
to[color=blue][color=green]
> > get[color=darkred]
> > > your audio.
> > >
> > > Reason for this is that Snom370 support G.722 wide band audio,[/color][/color][/color]
so[color=blue][color=green]
> > will[color=darkred]
> > > give you the best audio quality.
> > >
> > > I can't think of a better way of doing it without buying[/color][/color][/color]
broadcast[color=blue][color=green]
> > sound[color=darkred]
> > > style encoders and decoders. Mega bucks.
> > >
> > >
> > > Tim
> > >[/color]
> >
> > Thanks for the reply gents, but I suspect you have misunderstood[/color][/color]
my[color=blue][color=green]
> > requirement. I very specifically do NOT want any form of dial-up
> > circuit. The line must be end-to-end permanently open - just like[/color][/color]
a BT[color=blue][color=green]
> > private wire which would cost a fortune. Presentation should[/color][/color]
ideally[color=blue][color=green]
> > be 600R floating or balanced.[/color]
>
> if you have PBXes (or the IP equivalent) then you may be able to[/color]
program a[color=blue]
> fixed link between them - cost approx zero....
>
> "real" IP audio codecs are not cheap (for some definition of cheap[/color]
of[color=blue]
> course) - these are usually stereo (at least) and 15 or 22 KHz audio
> channel.
>
> They also tend to eat bandwidth, so you should check how much you[/color]
are[color=blue]
> willing to use.
>
> as an example, you are going to need 400 Kbps+ to get 16 bit sampled[/color]
stereo[color=blue]
> using enhanced APTX compression (which is what a lot of radio[/color]
broadcasters[color=blue]
> seem to use)
>
> [url]www.broadcom.co.uk[/url] is 1 source we have used.
>
> if codecs are a bit steep then esp if you have a typical corporate[/color]
network,[color=blue]
> some cisco router models can take analog speech interfaces - set[/color]
them up to[color=blue]
> do point to point permanent G.711 and you get 3.5 Hkz / 8 bit[/color]
sampled sound[color=blue]
>
> this could still run out several £100 when you add voice grade[/color]
feature upgra[color=blue]
> des for the routers, voice interfaces and DSPs - but 2nd and more[/color]
channels[color=blue]
> will be cheaper.....[color=green]
> >
> > I suppose I really need some form of single line mux.
> >
> >
> > --
> > Woody
> >
> > harrogate3 at ntlworld dot com[/color]
> --
> Regards
>
> [email]stephen_hope@xyzworld.com[/email] - replace xyz with ntl
>
>[/color]

Just what I wanted - the circuit concerned uses Cisco routers!

I should have said at the start that I only need a single audio (i.e.
mono) pathe with a 300-3000Hz audio response, the flatter the batter.
Looks like the last option will fit the job perfectly.

Many thanks.


--
Woody

harrogate3 at ntlworld dot com