[opendtv] Re: More Questions

At 4:52 PM -0800 11/20/05, Ron Economos wrote:
>SMPTE 292M blanking is not necessarily all nulls. Typically,
>it's used for SMPTE 299M embedded audio.
>//
>http://www.smpte.org/smpte_store/standards/pdf/s299m.pdf
>
>Just out of curiosity, can you provide a link or reference to a
>product that uses HD-SDI in an alternative way (file download,
>2x transfer, etc.)?
>

Yes, the packets that are not used for transporting the synchronous 
video can be used to carry other info, even in synchronous operations.

There is another SMPTE standard for the carriage of packet data over 292M:

SMPTE 348M-2000: for Television - High Data-Rate Serial Data 
Transport Interface (HD-SDTI)
This standard provides the mechanisms necessary to facilitate the 
transport of packetized data over a synchronous data carrier. The 
HD-SDTI data packets and synchronizing signals provide a data 
transport interface which is compatible with SMPTE 292M (HD-SDI) such 
that it can be readily used by the infrastructure provided by this 
standard.

Many 292M products support 348M, however, it appears that there is 
not much of a market for this application. Probably because Gigabit 
Ethernet owns that market and the costs are much lower.

If you Goggle 348M you will get about three pages of hits. It looks 
like Thomsom/GVG may be using 292M as a serial data interface in 
their newsroom systems.

Regards
Craig

 
 
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