Green Did you know a TV, running 5 hrs a day, only uses $21.09 of electricity a year?
Video Gary Shapiro discusses the impact of government policies on the economy.
CEA Get the big picture with CEA's digital imaging benchmark


Standards Details

Line 21 Data Services
Document Number:
Serves as a technical guide for those providing encoding equipment and/or decoding equipment to produce material with encoded data embedded in Line 21 of the vertical blanking interval of the NTSC video signal. It is also a usage guide for those who will produce material using such equipment. Revision incorporates analog content advisory, TSID, URL and other prior standards and bulletins.
Product Mark:
Committe Name:
R4.3 Television Data Systems Subcommittee
Publication Date:
April 01, 2008
$300.00 (Standard) $225.00 (Member)
CEA members receive 25 percent off regularly priced documents by calling TechStreet at 1-800-699-9277 or 1-734-780-8000. Visit  to buy the document. CEA members receive 25 percent-off regularly priced documents by using code CEA2014.
Digital television, DTV, embedded data, data stream, closed captioning, program guide, line 21, data, data services, encoding, encode, decoding, decode, transmission, NTSC, analog television, TV, content advisory, v-chip, video, CEA


Standard Preview:
IP Proffers

Join a CEA Standards Group

This is where consumer electronics professionals and enthusiasts gather to develop industry standards. Plus, it's free for CEA members!

Learn More

Buy a CEA Standard

Learn More

Contact Technology & Standards