Thomas;Without knowing more about your actual network topology the best I
can do is offer a few pointers, but here goes.384k is generally considered
the lowest common denominator for acceptable quality professional
videoconferencing. This was originally based on a 3-Bri h.320 (ISDN) system.
If people are not moving around much it is not necessary to send screen
updates as often in order to maintain a subjectively acceptable experience.
It depends on whether your doing a talking head type of thing where someone
is sitting at a table as opposed to distance learning with a person moving
around alot. While Polycom is generally considered the professional's
choice, VCON http://www.vcon.commakes excellent h.320 and h.323 (IP) based
videoconferencing systems which include a rate adaptive algorithm which can
reduce the rate of updates sent out based upon network congestion. They also
have an interactive multicast capability which is unmatched by any other
vendor as far as I know. I would highly recommend their products.One of the
possible solutions to your bandwidth limitations would be to use an h.320 to
h.323 gateway such as the Accord MCU (for PRI...now owned by Polycom) which
will also give you a "Brady Bunch" group view of multiple participants or
Radvision L2W-323 (for BRI). These would allow you to do your
videoconferencing over IP within your campus(es) and use ISDN to extend the
calls to other sites without impacting your data network as well as adding
the capability of calling outside of your corporation to anyone else's h.320
based system.Of course this is all assuming you were interested in
videoconferencing. If video streaming is part of your query, you had best
plan on at least 1.5Mb/sec for an acceptable MPEG1 stream. There are several
players, Minerva probably being the best of the breed for encoders, Optibase
being another. I get CNBC to the desktop at work via IP multicast. It's
pretty cool I must say, just make sure you have IGMP snooping, er excuse me
CGMP enabled on your switches.As mentioned by others QOS is also important
whenever you are running any latency sensitive traffic, but especially for
IP Telephony and Video.HTH> > > From: [EMAIL PROTECTED]>
[mailto:[EMAIL PROTECTED]]On Behalf> Of> > > Thomas N.> > > Sent:
Monday, September 10, 2001 8:35 PM> > > To: [EMAIL PROTECTED]> > >
Subject: Video/Voice over IP [7:19351]> > >> > >> > > Hi All,> > >> > > My
company is concerning about running> voice/video over IP> > > network. Our
WAN> > > is running on fractial T1, so bandwidth> limitation is a big
problem> to> us.> > > What will be the mininum bandwidth requirement> for
voice and> > > video traffic?> > > 128k? Thanks!> > >> > > Thomas N.> > > >
> Message Posted at:>
http://www.groupstudy.com/form/read.php?f=7&i=19368&t=19351>
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