[AG-TECH] Bidirectional video/audio conference problem

[Jason Bell]

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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