Antwort: IP over DVB-RCS

[Torsten.Jaekel@FTK.rohde-schwarz.com]

Hi,

I am not (yet) so familiar with RCS but a bit with ATM.
There are different ATM Adaption Layers (AAL). AAL5 (using jumbo frames) has
just a 32 bit CRC, no approaches for data integrity (issue of
higher layers).
But if you use AAL1 (I do not know if intended for RCS, perhaps because this is
also used for MPEG-2 via ATM),
there is an ATM based FEC algorythm (Reed Solomon), in addition to MPEG-2 FEC.

Is this similar to CableModems (DOCSIS) where the Uplink is also ATM-like ?

Best regards

Torsten

Torsten Jaekel
Product Marketing Datacasting
Rohde & Schwarz FTK GmbH
Wendenschlossstr. 168, Haus 28
12557 Berlin
Germany
Phone: +49 30 65 89 1 - 103
Mobile: +49 171 765 09 06
FAX:     +49 30 65 55 02 21
email: Torsten.Jaekel@FTK.rohde-schwarz.com

|+-----------------------------+-----------------------------------------------|
||   "Fabrice Arnal"           |                                               |
||   <fabrice.arnal@tesa.prd.fr|           An:        "Liste de diffusion IP / |
||   >                         |   DVB" <ip-dvb@erg.abdn.ac.uk>                |
||                             |           Kopie:        (Blindkopie: Torsten  |
||   03.04.2002 15:54          |   Jaekel/FTK)                                 |
||   Bitte antworten an ip-dvb |           Thema:        IP over DVB-RCS       |
||                             |                                               |
|+-----------------------------+-----------------------------------------------|






Hi everybody,


Something is not clear for me, with the DVB-RCS standard.

It is possible, for coding, to use either reed-solomon / convolutionnal coding,
either turbo-codes. But in specifications, it is possible not to use MPEG-2 TS
over DVB-RCS, whereas the (reed-solomon) redundancy is well defined (trailer of
the mpeg-2 TS packet). How can we do, for coding, if we use for instance ATM
cells ? Is some specific headers are defined for this ? How can we use DVB-RCS
without MPEG-2 TS about that?



With regards,
_______________________________________

Fabrice Arnal - Laboratoire TéSA
2, rue Charles Camichel
BP 7122 - 31071 Toulouse Cedex 7 France
Tel : 05 61 58 80 15