[BC] Program links on the internet

[Dana Puopolo]

I understand Bernie...
BUT...good sounding digital audio can be had with as little as 24K bandwith
these days (AAC+ mono). Directway (and others) had better ALWAYS have that
much available!

I have an STL that is 60K mono MPEG-2. It runs from Framingham, Massachusetts
to Phidelphia, PA It is completely Internet based using Verizon DSL on both
ends, and Barix boxes for the transcoding (UDP protocol). It's been running
for over eight months with one outage-the DSL modem in PA had to be rebooted
after six months of operation. We now reboot it once a month.
I'm talking NO problems whatsoever other then that one hardware one.
NO outages, NO glitches...NOTHING! I run a four second buffer so the 
receiving Barix can conceal errors.
Sound quality is great-we get compliments on how clear the (AM) station
sounds.

We're using 60K of the 1500K download capability of the DSL. We made sure that
the noise margins were good on both DSL circuits before we put it into
service.

Keep the bandwith requirements less then 10% of the circuits' rated bandwith
and there will be no problems...

-D

------ Original Message ------
Received: Thu, 26 Apr 2007 09:38:09 PM EDT
From: Bernie Courtney <bcourtney at metrobcast.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Subject: [BC] Program links on the internet

QOS does not work unless its implemented end-to-end, including the 
core terminal equipment and routers, otherwise you are just 
controlling the bandwidth you are putting on the network, not anybody else's.

There is still no way on a system like Directway, or even any other 
readily available consumer grade connection to GUARENTEE x amount of 
bandwidth, even within their own network.  You can get a connection 
bigger then you need and roll the dice, but you are still doing just 
that- rolling the dice.  I'm well aware of the limitations, 
technologies, and protocols involved; that's why I said that I'd 
never trust a program link to any such setup.

Bernie

-----Original Message-----
From: Dana Puopolo

QOS routers are available for 49 bucks these days. Using an ISP like
Directway
(satellite) universally would insure that the delay is constant between all
stations. Staying within one company's infrastructure also eliminates the use
of peering points, which is usually where packets get lost.

There are ways of making IP audio transfer work well and reliably. You simply
have to know the limitations and follow the rules.

-D

------ Original Message ------
From: Bernie Courtney <bcourtney at metrobcast.com>

"could" is the key word in there, depending on network conditions, various
backbones and routing paths, there is really no way to precisely, 100% of the
time, sync all client sites as you can when you have a known constant like a
dedicated transponder on a satellite with X amount of delay end to end.

The other issue would be reliability, IP networks for remotes - sure.  Using
public, non QOS enabled networks, for an STL or for live long form program
delivery, you'd have to be nuts or just like playing with fire.

Bernie


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