[AG-TECH] Bidirectional video/audio conference problem

N. Satyanarayana nanduris at cdac.in
Wed Feb 2 23:25:27 CST 2011


Hi Jason,

Thank you for your inputs. I will go thru the material and hope the
problem will be solved.

Regards,
Satya

On Thu, Feb 3, 2011, Jason Bell <j.bell at cqu.edu.au> said:

> G'day Satya
> 
> Generally speaking, the Access Grid uses the network protocol "Multicast" by default to enable communication between "joined" parties. 
> 
> You might find the following document http://www.accessgrid.org/firewall-doc useful.
> 
> I am not 100% sure whether the AG supports " Source Specific Multicast ", but I simply know that the AG by default uses the multicast protocol (whether this is Source Specific or not - I am not sure, haven't heard the use of that terminology much before).
> 
> In regards to your problems, I suspect that the issue is more related to audio device and configuration.  You could conduct some self-testing on each of your Access Grids to assist with trouble shooting.  I suggest you have a look at http://www.accessgrid.org/qa-improve, as it provides some practical examples on testing Access Grid systems.
> 
> Additionally, you may wish to attend the ASIA-Pacific weekly test session to receive feedback about your Access Grid from other AG users.  Details for the session are as follows:
> 
> When:       	Every Monday
> 
> Time:       
> 		Bangkok                	8.00am
> 		Beijing		    	9:00am
> 		Manila                  	9.00am
> 		Singapore               	9.00am
> 		Taipei                  		9.00am
> 		Perth                   		9.00am
> 		Seoul                  		10.00am
> 		Tokyo                  		10.00am
> 		Brisbane               	11.00am
> 		Adelaide               	11.30am
> 		Canberra               	12.00pm
> 		Hobart                 		12.00pm
> 		Melbourne              	12.00pm
> 		Sydney                 	12.00pm
> 		Auckland                	2.00pm
> 
> Venue:      	APAG Lobby -> AG-EVO at AU Bridge Lobby -> EVO-AG Testing Room
> 		(https://130.102.78.178:8000/Venues/ac10cd0111eb76b4d3d7bb213a5aa975b) 
> 
> Version:    AG3
> 
> Additionally, some presentation material, including AG testing and network information can be found http://www.arcs.org.au/index.php/component/content/article/77-video-collaboration/390-video-collab-pres.
> 
> Anyway - I hope helps you with solving your problems.
> 
> Cheers,
> Jason.
> 
> 
> -----Original Message-----
> From: ag-tech-bounces at lists.mcs.anl.gov [mailto:ag-tech-bounces at lists.mcs.anl.gov] On Behalf Of N. Satyanarayana
> Sent: Tuesday, 1 February 2011 03:00 PM
> To: ag-tech at mcs.anl.gov
> Subject: [AG-TECH] Bidirectional video/audio conference problem
> 
> Hi,
> 
> We are facing problem in realizing two way interaction with Access grid.
> We have a dedicated network across three different cities with multicast enabled in our routers. I believe each venue can be configured with only one multicast group ip address with separate ports for video and audio transmission.
> 
> The network provider is saying that a node cannot be source as well as receiver at the same time but in AG it is observed that all the hosts participating in a particular venue session are transmitting both audio and video. He is saying it is not the right way of experimenting bidirectional communication thru audio/video.
> 
> He is asking whether AG supports Source Specific Multicast or not, because he is saying bidirectional communication thru audio/video can be realized only thru SSM support. But i did not find any means on how to configure SSM in access grid. I am using AG 3.1 all in one windows installer.
> 
> Some times we are facing audio echo and some times noise problem. I am not able to understand whether it is because of audio devices or network configuration.
> 
> Can you throw some light on where the problem could be as we are not able to conclude whether it is due to network or audio devices.
> 
> Regards,
> Satya
> --
> N. Satyanarayana
> Centre for Development of Advanced Computing (C-DAC) No. 1, Shivbagh Ameerpet Hyderabad - 500 016
> 
> (Off) +91-40-23737124/25
> 
> http://www.cdachyd.in/econtentquality
> 
> 
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-- 
N. Satyanarayana
Centre for Development of Advanced Computing (C-DAC)
No. 1, Shivbagh
Ameerpet
Hyderabad - 500 016

(Off) +91-40-23737124/25

http://www.cdachyd.in/econtentquality
http://180.149.48.114/ccr



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