continuous audio/video test request

Jonas Talandis jonast at evl.uic.edu
Fri Apr 7 09:22:10 CDT 2000


Your plan works for us. Please note that the EVL AG Node will be 
inoperative today through Monday Apr 10. Our room is undergoing qualified 
disarray courtesy of UIC physical plant.

**EVL will not be able to participate in the Corridor One test cruise today**



At 04:53 PM 4/6/00 -0500, you wrote:
>Based on our experience today with audio/video dropouts at ACCESS-DC, I'm 
>beginning to worry about another possible network failure mode.
>
>It seems that our earlier testing worked fine when we were doing 
>straightforward audio sound checks:  "Hey can you hear me?  Testing 1, 2, 
>3."  "Yes we hear you."  But when we went to one site transmitting 
>continuously for more than a couple of minutes, we started seeing 
>occasional dropouts.
>
>I would like to see us do some longer-term audio testing in our upcoming 
>cruises.  Each participating site should be prepared to transmit 20 
>minutes of continuous audio, perhaps from a Compact Disc or a local radio 
>station.  We might wish to use a "boom box" so that we include the local 
>site microphone/Gentner/audio-capture systems as well.  During the test 
>session, the sites would alternate transmitting for 10-15 minutes 
>each.  While a given site transmits, each of the other sites would report 
>(through the mud) whether they experience any audio dropouts or other 
>anomalies.
>
>Once we have the various site problems worked out, we would repeat the 
>test while a large set of video sources are active.  (Perhaps each site 
>could play a movie into their Access Grid node.)  This would provide us 
>the opportunity to test the networks for loss while under a heavy 
>load--much like we see during an actual event.
>
>Cruise Directors: may we incorporate this type of testing in the agenda 
>for upcoming session(s)?
>===
>Bill Nickless    http://www.mcs.anl.gov/people/nickless      +1 630 252 7390
>PGP:0E 0F 16 80 C5 B1 69 52 E1 44 1A A5 0E 1B 74 F7     nickless at mcs.anl.gov


---------------------------------------------------------
Jonas Talandis
Electronic Visualization Laboratory
University of Illinois at Chicago
voice: 312-996-3002  fax: 312-413-7585
jonast at evl.uic.edu 



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