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

Manu Abraham abraham.manu at gmail.com
Wed Nov 7 22:07:54 CET 2007


Manu Abraham wrote:
> 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/
> 

Just try whether you can acquire a lock.

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

Was too fast about this one. :-(

Regards,
Manu




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