- Extended Data Services
Extended Data Services (now XDS, previously EDS), is an American standard classified under
Electronic Industries Alliancestandard CEA-608-E[http://www.ce.org/Standards/browseByCommittee_2523.asp] for the delivery of any ancillary data( metadata) to be sent with an analog televisionprogram, or any other NTSC video signal.
XDS is used by
TV stations, TV networks, and TV programsyndication distributors in the USA for several purposes.
Here are some of the most common uses of XDS:
* The "autoclock" system delivers
timedata via an XDS "Time-of-Day Packet" for automatically setting the clockof newer TVs & VCRs sold in the USA. Most PBS stations provide this service.
* Rudimentary program information which can be displayed on-screen, such as the name and remaining time of the program,
V-chip content ratings data.
XDS is also used by the American TV network ABC for their
Network Alert System(NAS). NAS is a one-way communication system used by ABC to inform and alert their local affiliatestations across the USA of information regarding ABC's network programming (such as program timings & changes, news special report information, etc.), using a special decodermanufactured for ABC by EEG Enterprises[http://www.eegent.com] , a manufacturer of related equipment for the TV broadcast industry such as closed captioningand general-purpose XDS encoders.
XDS uses the same line in the
VBIas closed captioning (NTSC line 21), but it utilizes the second video field (as opposed to closed captioning's line 21, field 1).
* [http://www.csc.uvic.ca/~csc454/notes/fault.vcrtime.html Does anybody really know what time it is?] - Faults & Failures October 2000 IEEE Spectrum - about some failures in the autoclock system in
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