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

[<mocm@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, the arm in the av711x drives the mpeg decoder, the section
filters and of course the communication with the PC. The PC just tells
the ARM what to do. That is why when your PC crashes sometimes the ARM
keeps on running and you can still see the last program you selected.
If you wouldn't have the ARM, you'd have a NOVA card, where the PC
does all that stuff.


 > 
 > > 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?
 > 

Sure, it is. It's the same as if you would use an unswitched ethernet
connection. I would check if my provider encrypts the data they send
to you. I don't know how it is with cable modems, they may even have
switches, so that you only get the data you are supposed to get, but
e.g. for satellite Deutsche Telekom seems to encrypt the data they
send. 

Marcus

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| Dr. Marcus O.C. Metzler        |                                   |
|--------------------------------|-----------------------------------|
| mocm@metzlerbros.de            | http://www.metzlerbros.de/        |
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