[linux-dvb] Re: Newby, channels.conf, ARM-stuff

[Ralph Metzler <rjkm@metzlerbros.de>]

Benjamin Forgeau writes:
 > 
 > 	Thanks for your long answer.
 > 
 > > The av711x has an arm core. This has nothing to do with the libdvb api
 > > since the api is supposed to be hardware independent. The stuff in
 > > gnufirm is a minimal skeleton for writing an ARM application for the
 > > AV7110 on a  Siemens/Technotrend/Hauppauge DVB-S board. It does not
 > > provide any functionality yet. Just as it states in the README file in
 > > gnufirm.
 > 
 > 	As far as I understood, there is an ARM processor inside only because 
 > the av711x is a chip aimed at the integration of all the components 
 > needed for a Set-Top Box. The PCI cards use this chip but do not need 
 > the ARM processor, because we already have our x86. Is that right?

No, that's wrong. The ARM still has to manage the whole DVB hardware
and move the filtered data to the dual ported RAM where the SAA7146
can move it to/from.
 

 > > Any data that is transmitted under the DVB standard via cable or
 > > satellite can be received by the DVB cards. Encrypted data has to be
 > > decrypted before you can use it, otherwise there is no limitation.
 > 
 > 	But I mean, if my neighbour is surfing via a cable-modem, can I read 
 > the downstream?? This must be encrypted within DVB, else it's a major 
 > security issue, no?

If they really use DVB (e.g. IP/MPE packets in sections) they should
encrypt it. But don't just assume that they do. Many IP over SAT services e.g. 
do not encrypt the data which is sent to single users (i.e., do not
fetch mail over SAT IP services!).


Ralph


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