Extended Data Services is an American standard classified under Electronic Industries Alliance

Electronic Industries Alliance

The Electronic Industries Alliance was a standards and trade organization composed as an alliance of trade associations for electronics manufacturers in the United States. They developed standards to ensure the equipment of different manufacturers was compatible and interchangeable...

 standard CEA-608-Ehttp://www.ce.org/Standards/browseByCommittee_2523.asp for the delivery of any ancillary data

Data

The term data refers to qualitative or quantitative attributes of a variable or set of variables. Data are typically the results of measurements and can be the basis of graphs, images, or observations of a set of variables. Data are often viewed as the lowest level of abstraction from which...

 (metadata

Metadata

The term metadata is an ambiguous term which is used for two fundamentally different concepts . Although the expression "data about data" is often used, it does not apply to both in the same way. Structural metadata, the design and specification of data structures, cannot be about data, because at...

) to be sent with an analog television

Analog television

Analog television is the analog transmission that involves the broadcasting of encoded analog audio and analog video signal: one in which the message conveyed by the broadcast signal is a function of deliberate variations in the amplitude and/or frequency of the signal...

 program, or any other NTSC

NTSC

NTSC, named for the National Television System Committee, is the analog television system that is used in most of North America, most of South America , Burma, South Korea, Taiwan, Japan, the Philippines, and some Pacific island nations and territories .Most countries using the NTSC standard, as...

 video signal.

XDS is used by TV stations, TV networks, and TV program syndication

Television syndication

In broadcasting, syndication is the sale of the right to broadcast radio shows and television shows by multiple radio stations and television stations, without going through a broadcast network, though the process of syndication may conjure up structures like those of a network itself, by its very...

 distributor

Distributor

A distributor is a device in the ignition system of an internal combustion engine that routes high voltage from the ignition coil to the spark plugs in the correct firing order. The first reliable battery operated ignition was developed by Dayton Engineering Laboratories Co. and introduced in the...

s in the USA for several purposes.

Here are some of the most common uses of XDS:

• The "autoclock" system delivers time
  Time
  Time is a part of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change such as the motions of objects....
  
   data via an XDS "Time-of-Day Packet" for automatically setting the clock
  Clock
  A clock is an instrument used to indicate, keep, and co-ordinate time. The word clock is derived ultimately from the Celtic words clagan and clocca meaning "bell". A silent instrument missing such a mechanism has traditionally been known as a timepiece...
  
   of newer TVs & VCRs sold in the USA. Most PBS
  Public Broadcasting Service
  The Public Broadcasting Service is an American non-profit public broadcasting television network with 354 member TV stations in the United States which hold collective ownership. Its headquarters is in Arlington, Virginia....
  
   stations provide this service.
• Rudimentary program information which can be displayed on-screen, such as the name and remaining time of the program,
• Station identification
  Station identification
  Station identification is the practice of radio or television stations or networks identifying themselves on air, typically by means of a call sign or brand name...
  
  ,
• V-chip
  V-chip
  V-chip is a generic term for technology used in television set receivers in the USA, Canada, and Brazil which allows the blocking of programs based on their ratings category. It is intended for use by parents to manage their children's television viewing...
  
   content rating
  Content rating
  Content rating most often means the suitability-to-audience of TV broadcasts, movies, comic books, or computer games.The introduction of Internet to the global population has revolutionized the way of consuming and gaining access to the virtually unlimited variety of contents...
  
  s data.

XDS is also used by the American TV network ABC

American Broadcasting Company

The American Broadcasting Company is an American commercial broadcasting television network. Created in 1943 from the former NBC Blue radio network, ABC is owned by The Walt Disney Company and is part of Disney-ABC Television Group. Its first broadcast on television was in 1948...

 for their Network Alert System (NAS). NAS is a one-way communication system used by ABC to inform and alert their local affiliate

Affiliate

An affiliate is a commercial entity with a relationship with a peer or a larger entity.- Corporate structure :A corporation may be referred to as an affiliate of another when it is related to it but not strictly controlled by it, as with a subsidiary relationship, or when it is desired to avoid...

 stations across the USA of information regarding ABC's network programming (such as program timings & changes, news special report information, etc.), using a special decoder

Decoder

A decoder is a device which does the reverse operation of an encoder, undoing the encoding so that the original information can be retrieved. The same method used to encode is usually just reversed in order to decode...

 manufactured for ABC by EEG Enterprises http://www.eegent.com, a manufacturer of related equipment for the TV broadcast industry such as closed captioning

Closed captioning

Closed captioning is the process of displaying text on a television, video screen or other visual display to provide additional or interpretive information to individuals who wish to access it...

 and general-purpose XDS encoder

Encoder

An encoder is a device, circuit, transducer, software program, algorithm or person that converts information from one format or code to another, for the purposes of standardization, speed, secrecy, security, or saving space by shrinking size.-Media:...

s. The CBS

CBS

CBS Broadcasting Inc. is a major US commercial broadcasting television network, which started as a radio network. The name is derived from the initials of the network's former name, Columbia Broadcasting System. The network is sometimes referred to as the "Eye Network" in reference to the shape of...

 Television Network uses a similar method to transmit three separate internal messaging services to stations: one for programming departments, one for master control operations, and one for newsrooms.

XDS uses the same line in the vertical blanking interval

Vertical blanking interval

The vertical blanking interval , also known as the vertical interval or VBLANK, is the time difference between the last line of one frame or field of a raster display, and the beginning of the first line of the next frame. It is present in analog television, VGA, DVI and other signals. During the...

 as closed captioning (NTSC line 21), and shares the available second video field

Field (video)

In video, a field is one of the many still images which are displayed sequentially to create the impression of motion on the screen. Two fields comprise one video frame...

bandwidth with the closed captioning channels CC3 and CC4, and with the text channels TXT3 and TXT4.

External links

• Does anybody really know what time it is? - Faults & Failures October 2000 IEEE Spectrum - about some failures in the autoclock system in 2000