Talk:DVB-RCS

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My apologies to the original author but I read this article and found the paragraphs I edited to be poorly put together and they seemed 'wrong'. I'm not qualified to make much in the way of amendments but I believe it is now less confusing and feels more 'grown up'. I did briefly research the MFTDMA reference and am taking it to be a modification of TDMA (there are a number of google-able references relating to satellite transmissions using this protocol). I also think that shedular was a mis-spelling... --Thickycat (talk) 15:04, 18 January 2009 (UTC)[reply]

Comment

There is a big mistake. DVB-RCS is not a digital broadcasting technology. It is a return link specification. There is no broadcasting involved in satellite user uplink. —Preceding unsigned comment added by SatcomMan (talk • contribs) 17:10, 31 March 2010 (UTC)[reply]

I read it again, and can't believe in my eyes. I am sorry but this article is rubbish, pure and simple; great argument for people who believe wikipedia is unreliable. I don't have enough time at the moment to correct it. DVB-RCS is a satellite return link specification, designed for geostationary satellites in Ku and Ka bands. The specification was developed by the DVB organisation, and endorsed by European Telecommunications Standards Institute (ETSI). SES Astra is a satellite operator that uses DVB-RCS among many others. There is no need of mentioning Astra, or any other commercial entity, specifically.

GMSK is not part of DVB-RCS specification. QPSK is. Indeed, a satcom terminal transmitting in GMSK is not DVB-RCS compliant.

DVB-RCS terminals are compliant with DVB-S and DVB-S2 signals on the forward link. Now, DVB-S and DVB-S2 are broadcasting specifications. DVB-RCS uses multi-frequency TDMA on the return link. Nothing fancy, apart from the name. MF-TDMA enables terminals with smaller antennas and lower transmission powers. The return link band is divided into smaller chunks and each chunk is allocated dynamically on a TDMA-basis. Dynamic allocation is based on CF-DAMA.

If you're a student like me, don't waste your time with this article. Just go to http://pda.etsi.org/pda/queryform.asp and download the specification. Also read the implementation guidelines. Specification doc no: EN 301 790 Implementation Guidelines doc no: TR 101 790 ......................................................

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