Re: Open Heart Surgery broadcast....

Mark Thacker, Internet Specialist (
Fri, 01 Mar 1996 12:45:27 -0600

Oh my.... guess what? I misunderstood the documentation!!!
I thought you had to use the -broadcast on the 'receiving'
reflectors, not the primary one!?!?!?!

Dang it.

Well, I just tested it and everything works just fine.
Great... just moments before the open heart surgery is to
be broadcast....

Well folks, we think we might do a 'rebroadcast' off video
tape later on. More details on that as they are available.

For the curious, to do the "NASA-like" receive only
broadcast, I did the following using Cornell's CU-SeeMe
Reflector version 4.00B3 for Solaris:

Main Reflector receives signal from Mac/PC
Main has the following in it's reflect.conf file:

ADMIT-SENDER x.x.x.x (this is the source Mac/PC)
CONF-ID 0 We are Using Conference 0
CAP 80 1 Using to high of a CAP, disconnected for 1 min
MAX-PARTICIPANTS 20 message goes here
MAX-SENDERS 1 Max senders message here
MAX-LURKERS 19 Max lurkers here

* start the reflector with the -broadcast option:
"$ reflect -broadcast &"
(DON'T tell anyone this machine's address)

Reflector #2 is in a 'receive only' type mode and
has the following in it's reflect.conf:
OBTAIN-GENERAL-BCC x.x.x.x 0 (where x.x.x.x is Ref #1)
(the rest can be the same as in Ref #1)

Start this reflector normally "$reflect &".
Tell the whole world about Reflector #2.

Thanks again folks. Of course, I didn't get all of this
information until AFTER I needed it (my fault for getting
so wrapped up in the problem that I ignored potential

On Thu, 29 Feb 1996 11:37:14 -0500 Brian O'Shea
<> wrote:

> >We are currently considering this for Friday around noon
> >Central time. > >
> >Thanks to all of the people that provided me with
> >information about limiting the video/audio broadcast to
> >just a single source (i.e. like NASA does). WhitePine
> >software had the best overall suggestion for how to do this
> >and have multiple mirror sites.
> Your welcome. I'm glad you sent this mail, I was going to have to search back
> to find your address. One of the things that I'm not sure I mentioned in my
> description. If there is only one video source connected to the primary
> reflector, which will be feeding the downstream reflectors, you must start the
> primary reflector with the -broadcast switch to force the single video sender
> to send his video. Otherwise, the single client doesn't think anyone is
> watching, and like a repsonsible bandwidth user, won't send it's video.
> -bos
> +***********************************************************************+
> + Brian O'Shea White Pine Software +
> + Network/OS Software Engineer 15 Messenger Square +
> + Suite 8A +
> + Fax 508-695-2378 Plainville MA, 02762 +
> + All it takes is all you've got. +
> +***********************************************************************+

Mark Thacker, Internet Specialist  214-648-2568
UT Southwestern Medical Center at Dallas
5323 Harry Hines, Dallas, Texas  75235-9049