Johannes Stezenbach wrote:
It really a bummer that EN 300 468 uses the term
"normative broadcast mode" without defining it,
It indeed says, in the very first line.
Normative Broadcast Mode (NBC-BS) [This is (Non Backwards Compatible -
Broadcast Service) ]
Page 12 (Abbreviations) EN 300 468
NBC-BS Non Backwards Compatible Broadcast Services (DVB-S2)
And it refers the same to EN 302 307, what it is in S2 satellite
delivery system descriptor
So what is the confusion ?
but I am now convinced that "normative broadcast mode (NBC-BS)"
means "those parts of NBC-BS which are mandatory",
i.e. "normative broadcast mode" means a subset of NBC-BS.
I thought NBC-BS = Non Backward Compatible - Broadcast Service
Look at EN 302 307 table 1.
*Looking at 302 307 Table 1*
They just mean it is Optional, that means those parameters can be there
or not, that is what i understand from the table. It is *not* a must
that, VCM since marked as "O" is Normative Broadcast Mode or Backward
Compatible
E.g. MIS is NBC-BS, but not part of "normative broadcast mode"
since MIS is an *optional* feature of NBC-BS.
Well EN 300 468 says, MIS is present in the
S2_satellite_delivery_system_descriptor.
And that descriptor is present *only* in Backward Compatible Mode (BC-BS)
One more interesting thing is that the STB0899 spec says,
SIS/MIS (1 bit): describes whether there is a single input stream or
multiple input streams. If SIS/
MIS = multiple input stream, then the second byte is the input stream
identifier (ISI), otherwise
the second byte is reserved.
This exactly matches EN 300 468, S2 satellite delivery system
descriptor's MIS and Input Stream Identifier.
So, if the standard and the device specs match correctly, shouldn't we
go for that ?
Manu
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