[linux-dvb] dvb-s2 parameters - rolloff & pilot

Andreas Oberritter obi at linuxtv.org
Fri Dec 14 20:28:12 CET 2007


Hi Igor,

Igor wrote:
> can somebody to explain when need switch on or switch off this options ?
> 
> dvb-s2 initial pilot on/off
> 0 OFF
> 1 ON

At least on Astra it depends on the FEC:

http://www.aps.de/resources/pdf/en-shared/technical_support/Digital_Satellite_Front-End_1_1_0.pdf

> dvb-s2 rolloff
> 0=0.20 (DVB-S2)
> 1=0.25 (DVB-S2)
> 2=0.35 (DVB-S2/DVB-S)

You can get the roll-off factor from the satellite delivery system
descriptor, which is specified in ETSI EN 300 468 V1.8.1 (2007-10). The
syntax of this descriptor was changed with the introduction of DVB-S2.

Regards,
Andreas




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