[linux-dvb] Re: DVB-CI question

[Andrew de Quincey <adq_dvb@lidskialf.net>]

On Friday 26 March 2004 15:14, Klaus Schmidinger wrote:
> Andrew de Quincey wrote:
> > ...
> > Its just it makes the driver's IO routines _really_ complex, as they have
> > to deal with multiple connections, multiple slots, the possibility that
> > the CAM can be yanked out by the user at any time, and lots of other
> > things. There is a LOT of complex locking involved to ensure it can't
> > break.
> >
> > Add to that the fact that each de-fragmented packet can be up to 65536
> > bytes,
>
> Strange, from what I know a TPDU can be at most 2048 byte long...

Out of interest, where does that 2048 figure come from? I can't see it in 
EN50221 or R206-001. I'm wondering if its an implementation limit imposed by 
the av7110 firmware. I can see why it would be like that; it really 
simplifies the defragmenter (I'll probably do the same myself).

However, the worrying thing is that I can't see how the *CAM* knows the 
maximum TPDU size; there doesn't seem to be a protocol for negotiating it. 
Can anyone suggest what I'm missing?


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