Re: [PATCH 6/6] Documentation: Update to include DVB-T2 additions

[Andreas Oberritter <obi@linuxtv.org>]

On 05/08/2011 09:13 PM, Steve Kerrison wrote:
> Hi Mauro
> 
>> +		<para>3) DVB-T specifies 2K and 8K as valid sizes.</para>
>>> +		<para>4) DVB-T2 specifies 1K, 2K, 4K, 8K, 16K and 32K.</para>
>>
>> It makes sense to add here that ISDB-T specifies 2K, 4K and 8K.
>> (yeah, sorry, it is my fault that I didn't notice it before ;) )
> 
> Actually note 1) in that list declares the sizes supported by ISDB-T;
> but the patch doesn't show it. So there is no blame to assign :)
> 
>> -#define DTV_MAX_COMMAND                         DTV_ISDBS_TS_ID
>>> +#define DTV_DVBT2_PLP_ID	43
>>> +
>>
>> Please document the PLP_ID as well. Just like ISDB-T, the best seems to
>> create a section with DVB-T2 specific parameters, and add this one there,
>> explaining its meaning.
> 
> I have created a section for DVB-T2 parameters. It's within the main
> ISDB-T section. If that's not appropriate I guess it can be hauled out
> as it grows. However, much like Antti, I don't know much about PLP or
> the other features of the T2 specification, so cannot contribute a great
> deal yet. PLP_ID isn't used by the cxd2820r driver - it's simply
> specified in Andreas' API patch.

In DVB-T2, each TS is contained in a 'Physical Layer Pipe' (PLP).
Multiple PLPs with individual tuning parameters may be combined on a
single transmitter frequency.

I don't know whether multiple PLP mode is or will be used in any
country. If no PLP ID or an invalid PLP ID is specified, the behaviour
of a demod may be undefined, i.e. it may select a random PLP or fail to
tune.

In DVB-SI, the PLP ID is carried within the T2 delivery system descriptor.

Regards,
Andreas