[linux-dvb] Re: DVB-CI question

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

> > I'm talking about the layer below that: Each of those TPDU fragments can
> > be further re-fragmented into multiple link layer packets when they're
> > actually written to the CAM. Link layer packets can be up to 65535 bytes.
> > I suppose I could use knowledge of the fact that the higher layers will
> > never send anything more than 2048 bytes to optimise that though.
>
> I don't know that much about the CI cruft, but IMHO
> EN50221 says that link-layer fragments are of the same size
> as the pyhsical layer fragement (annex A.3.2), and the
> buffer size for the physical layer is negotiated between
> the CAM and the host (annex A.2.2.1.1, buffer size negotiation
> protocol). The av7110 implementation uses the minimum required
> buffer size of 256 bytes (or less, according to negotiation).

Yeah, we're talking about the same thing here: LPDUs. An LPDU is a fragment of 
a TPDU.

However, TPDUs themselves have their own fragmentation system for some reason, 
which is *different* from the LPDU fragmentation. Klaus is talking about this 
TPDU fragmentation.

Lovely innit? :)


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