RE: Adding ULE into a network already using MPE...

["Allison, Art" <AAllison@nab.org>]

Fixed PID associations constrain multiplexers. I suggest you seek the
complexity impact assessment (both OTO and ongoing) from mux vendors to
have a 'fixed' or 'well known' PID. MPEG2 systems folks will tell you
this is a bad thing to do.  
__________________
Art Allison
Director, Advanced Engineering
NAB Science & Technology
1771 N St NW, Washington DC 20036
202 429 5418 
-----Original Message-----
From: owner-ipdvb@erg.abdn.ac.uk [mailto:owner-ipdvb@erg.abdn.ac.uk] 
Sent: Wednesday, August 03, 2005 2:39 PM
To: ipdvb@erg.abdn.ac.uk
Subject: Re: Adding ULE into a network already using MPE...


    I was thinking along those lines.  The sender associates the
encapsulation method with a particular PID and "knows" (via AR) which
PID to use to send to a particular receiver.  Receivers which only
understand MPE only use MPE PIDs.  Receivers which understand ULE and
MPE determine which method is being used by which PID is being received.
(I think the ULE capable receivers will still need to support MPE for
multicast traffic that is shared with "older" terminals.)

    I was wondering if there is a way for the receiver to look at the
header and determine if it is ULE or MPE on the fly.  I haven't taken a
close look at it yet.  But, I suspect that it is not reliably
possible...


John


Marie-Jose Montpetit wrote:

>I think this is one thing that could be solved by some of the 
>configuration work that was started where you could associate a PID to 
>an encapsulation. You may not want to ignore the new encapsulation.
>
>Marie-Jose
>
>  
>
>>-------- Original Message --------
>>Subject: RE: Adding ULE into a network already using MPE...
>>From: "Allison, Art" <AAllison@nab.org>
>>Date: Wed, August 03, 2005 2:05 pm
>>To: <ipdvb@erg.abdn.ac.uk>
>>
>>Use of the MRD will enable a device on a MPEG-2 network that does not 
>>understand that MRD's signaling/meaning to ignore the new
encapsulation.
>>
>>
>>Of course if the existing network just used private data with out 
>>signaling what it was, a problem may exist.
>>__________________
>>Art Allison
>>Director, Advanced Engineering
>>NAB Science & Technology
>>1771 N St NW, Washington DC 20036
>>202 429 5418
>>-----Original Message-----
>>From: owner-ipdvb@erg.abdn.ac.uk [mailto:owner-ipdvb@erg.abdn.ac.uk]
>>Sent: Wednesday, August 03, 2005 11:32 AM
>>To: ipdvb@erg.abdn.ac.uk
>>Subject: Adding ULE into a network already using MPE...
>>
>>
>>    Has anyone looked at the operational problems associated with 
>>adding ULE use to a network which has some deployed terminals which 
>>only understand MPE?
>>
>>
>>John
>>    
>>
>
>  
>