Re: French DVB-T Channel IDs vs. EIT Channel IDs

On Thu, 1 Mar 2018 10:22:10 +0100
Patrick Boettcher <[email protected]> wrote:

> On Wed, 28 Feb 2018 11:01:23 +0100
> Klaus Schmidinger <[email protected]> wrote:
> 
> > On 27.02.2018 17:58, Patrick Boettcher wrote:  
> > > On Tue, 27 Feb 2018 16:54:35 +0100
> > > Klaus Schmidinger <[email protected]> wrote:
> > >     
> > >> Hello Patrick,
> > >> 
> > >> your scan doesn't contain the NIT, which is where the transponder
> > >> innformation is broadcast. Can you scan that, too, please?    
> > > 
> > > Hi Klaus,
> > > 
> > > NIT attached (from another multiplex with the same symptoms).    
> > 
> >              DVB-DescriptorTag: 90 (0x5a)  [=
> > terrestrial_delivery_system_descriptor] descriptor_length: 11 (0x0b)
> >              Center frequency: 0xffffffff (= 42949672.095 kHz)
> > 
> > @@ -219,6 +219,8 @@
> >                    cDvbTransponderParameters dtp;
> >                    int Source = cSource::FromData(cSource::stTerr);
> >                    int Frequency = Frequencies[0] =
> > sd->getFrequency() * 10;
> > +                 Frequency = Transponder() * 1000000;//XXX
> > +                 dsyslog("Frequency = %08X, Transponder = %d",
> > sd->getFrequency(), Transponder());//XXX static int Bandwidths[] =
> > { 8000000, 7000000, 6000000, 5000000, 0, 0, 0, 0 };
> > dtp.SetBandwidth(Bandwidths[sd->getBandwidth()]); static int
> > Constellations[] = { QPSK, QAM_16, QAM_64, QAM_AUTO };  
> 
> It works. I had to have VDR recreate the channels because it was
> mixing things up with the already existing ones.
> 
> As to why the frequency is set to "-10" I don't know (yet), but I
> remember it has always been like this since 2005. 

Here is the explanation why the frequency field in French DVB-T shall
not be used, (cf. CSA-Profil-de-signalisationv3.4.pdf, page 30,
terrestrial_delivery_system_descriptor):

  le terrestrial delivery_system_descriptor diffusés dans la NIT
  correspond au cas général. En effet, la NIT ne décrit pas de façon
  exhaustive le réseau actuel d’émetteurs, mais l’organisation des
  services des multiplex diffusés : ainsi les fréquences des multiplex
  renseignées par le paramètre centre_frequency ont une valeur fixée à
  0xFFFFFFFF. Ces fréquences ne sont pas à prendre en compte

It says, grosso modo, that the NIT does not describe the network in an
exhaustive manner, but it does for services. Le field centre_frequency
contains the value 0xFFFFFFFF and is not to be taken into consideration.

--
Patrick.




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