[linux-dvb] DVB-S2 API vs. HVR4000: When?

Manu Abraham abraham.manu at gmail.com
Wed Nov 7 21:50:53 CET 2007


frankio wrote:
> Manu Abraham wrote:
>> Francesco Schiavarelli wrote:
>>  
>>> Johannes Stezenbach wrote:
>>>    
>>>> On Sat, Nov 03, 2007, Manu Abraham wrote:
>>>>      
>>>>> If you see H.2 and H.3, the difference is between CCM and VCM
>>>>> (Note: that both are cases of multiple "TS's")
>>>>>
>>>>> H.2 (CCM) is applicable for DVB-T muxes. Here there is a HP/LP stream
>>>>> selection in some fashion combined with the merger/slicer where
>>>>> stream id is used.         
>>>> What makes you think there is HP/LP involved? All H.2 says
>>>> is that two DVB-T streams are transmitted using one
>>>> DVB-S2 transponder to a DVB-T transmitter. The DVB-T transmitter
>>>> could then transmit them on two different frequencies in
>>>> non-hierarchical mode.
>>>>
>>>> (Indeed H.2 says "two DTT MUXes at 24 Mbit/s each" indicating
>>>> they are not hierarchical because you can't get that
>>>> bitrate in DVB-T hierarchical mode. But even if it were DVB-T
>>>> hierarchical mode it has nothing to do with DVB-S2 backwards
>>>> compatible mode hierarchical modulation.)
>>>>
>>>>       
>>> I agree with you, Johannes.
>>> There is no evidence of hierarchical modulation, nevertheless the two
>>> streams I was looking at had the same channel protection that is no
>>> HP/LP, and I was told it was DVB-S2 CCM.
>>>
>>> When the transponder will be up again I'll be able to do more tests.
>>>     
>>
>> Yeah, looks more like that, will have a patch soon to do some tests
>> for it.
>> STM's comments confirm that.
>>
>> Manu
>>
>>   
> Now the beam is up on 13.0E 11373 H 27500 8PSK 2/3
> It is made up of 2 DTT muxes (no HP/LP)
> ISI1   16QAM 1/2 1/4    9.953 Mbps
> ISI2   64QAM 5/6 1/4    24.882 Mbps
> 
> Unfortunately I don't  know how long it will last, so let the tests
> begin! :-)
> I'll wait for the patch.
>

In the meantime, can you please pull a copy of the multiproto tree
http://jusst.de/hg/multiproto/

and try to parse the S2 satellite delivery system descriptor ?
dvbsnoop, or even libucsi will be able to do this.
 
> thanks,
> Francesco
> 
> 

Regards,
Manu



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