[opendtv] Re: PSIP, cable guide info, and Zap2It

  • From: "John Shutt" <shuttj@xxxxxxxxx>
  • To: "OpenDTV" <opendtv@xxxxxxxxxxxxx>
  • Date: Mon, 9 Jul 2007 15:41:58 -0400
----- Original Message ----- From: "johnwillkie" <johnwillkie@xxxxxxxxxxxxx> 



John;

I'd be interested in knowing what provision is in A/65C (and not in -b or
the original) that you feel limits the ability of one station to carry the
PSIP information for other stations.

Maybe I missed a new word here or there in the latest version, but I know
of
no such limitation in PSIP.


Since I don't live and breathe PSIP, I qualified my statement with "I'm not
sure" because a cursory review of A/65 showed that all references for TVCT
(Terrestrial Virtual Channel Table) were to "the transport stream" which
could have been interpreted as excluding information not in the transport
stream. CVCT was more inclusive, referring to all transport streams, as one
would expect for a cable version of the standard.

However, after your challenge, I read more thoroughly and I did find one
sentence applying to Terrestrial that allows for multiple transport stream
guide data, so what was originally proposed vis a vis PBS stations is still
technically feasible, if not politically so.  A/65C, Section 5.1,
Requirement 5:

"Requirement 5: The PSIP tables shall describe all of the digital channels
multiplexed in the Transport Stream. For convenience, the tables may
optionally include information about analog channels as well as other
digital channels available in different Transport Streams."


Also, I should point out that A/65c isn't required by the FCC: the
20030318
version of A/65 is.
I know, and it mystifies me why the ATSC doesn't keep legacy versions of their standards (that are referenced by the FCC as the official rules) on their web site. 

John





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