Multipoint Cascading Issue!

Roni Even Roni_e at ACCORD.CO.IL
Tue May 18 01:50:23 EDT 1999


Gaurav,
I think that it is a good question. In H.320 that was the initial
cascaded mode supported. In recent a version the MIH BAS code was added
and a process describing multi hierarchy was defined in a tree structure
similar to T.120.
Roni Even

**********************************************
Roni Even
VP Product Marketing
Accord Video Telecommunication
Email: roni_e at accord.co.il
Tel: +972-3-9251412
Fax: +972-3-9211571
***************************************************

> -----Original Message-----
> From:	gmakkar at hss.hns.com [SMTP:gmakkar at hss.hns.com]
> Sent:	Monday, May 17, 1999 8:57 PM
> To:	h323implementors at imtc.org; ITU-SG16 at mailbag.cps.intel.com
> Subject:	Multipoint Cascading Issue!
> 
> 
> 
> 
>      Please refer to H.323 recommendation, clause 8.4.5, "There shall
> only be
> one master MC in a conference. A slave MC shall only be cascaded to a
> master MC.
> Slave MCs shall not be cascaded to other slave MCs. This allows only
> dumb-bell
> or star cascaded configurations.".
> 
>      My query is: why the above restriction? If one can have a
> multi-level tree
> structure in a T.120 conference, why should the above restriction be
> applied to
> an H.323 conference? Also, using the above, a conference (using a
> single MC) can
> have only 256 participants (terminal label is 8-bits). Cascading would
> be
> required to increase the size of the conference - again limited to
> 65536
> participants (that ofcourse is large-enough for a planned conference,
> if not
> adopt H.332) and that too in a "wierd" star configuration. Point is
> why have the
> Master MCU and its network subnet be overloaded with information from
> all slave
> MCs - why not permit a configuration in which an MC can act as a slave
> to one MC
> and a master to another. That way a tree configuration for the
> conference could
> be built.
> 
>      Am I missing something?? I would be greatful if someone could
> give some
> direction on this account.
> 
>      Thanks!
> 
> Regards,
> 
> Gaurav Makkar
> Senior Technical Leader,
> Hughes Software Systems
> 
> 
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