[opendtv] Re: More Questions
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Mon, 21 Nov 2005 12:26:08 -0500
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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