[BC] IP STL

[Bob Boxer]

I'm testing pair of Access' right now to see if it=92s a viable =
replacement
for remotes.  We want to see if we can eliminate ordering ISDN lines and
possibly POTS lines by using the remote location's existing internet
connection.  We also envisioned adding other services such as call
screening, remote printing, web browsing, possibly VOIP.

I've got one end connected to a moderately loaded DSL line at the =
station,
the other end connected to a lightly loaded cable connection at my =
house.

As expected, the more lightly loaded the internet connection is, the =
better
the quality is.  Audio delay is virtually always well below 200 ms, so =
doing
a two-way broadcast would not be a problem.  On the other hand, as
congestion on the HS connections increased, audio would start to =
degrade,
first developing an under-water, out of phase sound, reminiscent of what
I've heard on the Comrex Matrix under less than ideal conditions.  At =
its
worst, the audio would completely tear up, making it unusable.  Also, in
(joint) stereo mode we were aware of bleed between the left and right
channels.  Dual mono mode uses more bandwidth but seems to eliminate the
crosstalk.=20

While I don't think what I've heard would be acceptable for remoetes on =
my
stations, using this as a fixed STL is a completely different ballgame.
You're in control of the pipes at both ends, so you can order nice fat =
ones
and keep it clear of other traffic.  You can also turn on FEC =
(increasing
bandwidth requirements) and adjust some of the other settings (at the
possible expense of latency). =20

The units come equipped with standard modems, so I'm sure there's a way =
they
can be configured to autodial a POTS connection in the event that the =
high
speed connection drops.

I'd be inclined to call Comrex and arrange for a test.



=20

>=20
> I would love to hear more from anyone that has used or=20
> experimented with the Comrex Access or any other IP STL hardware.
>=20
>=20
> Thanks again,
>=20
> William J. Spry


----------------------------------------------------------------
Bob Boxer
ESPN-1000 Engineering
312-980-1042 - Office
847-778-6063 - Cell
bob.n.boxer at abc.com
bob.boxer at comcast.net
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