[Sis-ipo] Fwd: Re: IP over DVB-S2

[Adrian J. Hooke]

>Date: Wed, 22 Jun 2005 17:40:29 +0100
>From: Gorry Fairhurst <gorry at erg.abdn.ac.uk>
>Subject: Re: IP over DVB-S2
>To: ipdvb at erg.abdn.ac.uk
>Organization: Univesrity of Aberdeen
>
>The article bu K. Hogie et al is interesting, but seems not to have taken 
>a detailed look at DVB, specifically, I notice on page 661, section 4, it says;
>
>"one of the most important issues in this paper is to note that unlike 
>current space communication systems, commercial network products perform 
>forward-error-correction (FEC) coding, such as Reed-Solomon or 
>convolutional, independently from the data link framing. This is..."
>
>- I don't believe this was true of DVB bearers, in which the R-S codec is 
>synchronised using the MPEG-2 TS Synch byte, rather than embedding a 
>physical-layer synch word.
>
>- In DVB-S2, the waveform is more like a burst modulation. Two modes are 
>supported. One mode uses MPEG-2 TS formatting, the other mode (GS) could 
>utilise the BB frame header construct as the synchronisation point for a 
>new encapsulation protocol directly mapping IP and other network protocols 
>to the BB frame. The details of this have still to be defined.
>
>Gorry