Originally Posted by avnstf
hi again sfhub....yes, that paragraph was cited months ago on the Sony 250/500 thread, as indicated with your link, but there was much subsequent discussion, and when people went to the regs on cecbs, while they found that Gemstar had URGED in comments on the draft regs, that cecbs be required to transfer ALL the vbi info, it doesn't appear to some readers (including me) that this little tidbit was actually adopted in the final regs...
I've read the NTIA ruling and the letter sent by TVGOS to NTIA
Gemstar letter to NTIAhttp://www.ntia.doc.gov/otiahome/dtv...omment0082.pdf
NTIA Ruling on CECBshttp://www.ntia.doc.gov/ntiahome/frn...le_031207a.pdf
What Gemstar mainly wanted to accomplish was to get NTIA to permit
TVGOS VBI data to be passed along and reinserted by CECB. Their worst case scenario would be if CECB rules specifically disallowed 3rd-party guide data, like they do with some features such as component output.
I think you can see from the NTIA's ruling and the comments from the Gemstar tech contact that they accomplished their goal of getting TVGOS VBI data to be allowable under CECB rules, otherwise DTV-PAL and RCA would not have included any TVGOS support.
If you read the letter from Gemstar (dated in 2006), you will see that it would take very minimal effort to support TVGOS VBI data if entered into the design process at an early enough stage.
The CECBs boxes already need to support VBI CC reinsertion into their analog output. The added effort to reinsert TVGOS VBI data, which is on a different line of VBI, is basically a bitmask or config entry.
Given that it is so little effort to include support and that TVGOS was on top of things early on, I don't see reasons a CECB manufacturer would specifically remove support for full VBI reinsertion since they likely get it automatically from the base configuration of the chipsets they use.
Whether the CECB manufacturer tested it is a different question as is whether they have done anything extra to assure that the data allows a VCR, DVD-recorder, etc. to control the box properly.
I think many people when asking about TVGOS support care about the whole enchilada, not just getting the TVGOS guide data but being able to control the CECB as well. From a pure technical standpoint of whether you will get the data I would think most CECBs would reinsert the TVGOS VBI data (as they would CC and other VBI data) onto their analog output. I would consider this reinsertion of TVOGS VBI data practically assured, but not guaranteed.
Now the real "optional" part IMO is that the NTIA ruling allowed (but did not require) CECB's to actually use TVGOS guide data to display an EPG. I think most if not all CECBs are choosing to skip that feature, at least for their CECB-level product.
Given that, I would take the Gemstar tech comments to supersede any ambiguity you might have from earlier NTIA discussions. The rest of the information provided seems to check out so the guy sounds like he knows what he is saying. There really isn't any incentive for them to obfuscate the issue. It isn't like they can really do anything at this point and people would find out soon enough if there is a problem.
So IMO w/r/t CECB TVGOS VBI data reinsertion, not guaranteed, but effectively
most if not all CECBs will do this. I wouldn't get particularly anxious that the DTV-PAL is the rare exception that will do TVGOS VBI reinsertion. If you really depend on the feature wait for some guinea pig to test it out for the box you want.
You can probably search on DVS706 to find out more info.