Video Buses

[Component Video] [Composite Video] [DVI] [HDMI]
[DisplayPort] [Monitor Buses] [RS-170] [SCART] [SDI] [S-Video]


Component Video

Component Video is also called YPbPr, or YCbCr and transmits the picture information in a luminance and phase-opposite chrominance pair over three coax cables [Red, Green, and Blue].
RGB [Red, Green, Blue] is some times also called Component Video, but combine the color, black and white signal.

The gear, as in the Blu-ray player rear panel shown below is sometimes labeled;
'Y' for the Green cable
'PB' for the Blue cable
'PR' for the Red cable
Normally the connectors are also colored to match up with the cables.

Component Video Cable
Component Video Cable

YPbPr is 'sometimes' used when discussing the three-wire analog video component interface EIA-770 [EIA-770.2-a SMPTE-240M and others]. The luminance (Y) is represented separately from the color components (Pb and Pr).
In some cases The Y output is provided as a Green jack, the Pb is provided as a Blue jack, and the Pr is provided as a Red jack. The 'Y' signal carries the black and white information, The 'Pb' and 'Pr' signals carry the color difference signals.

YCbCr is used when discussing a digital component interface ITU-601 or ITU-656 digital interfaces (formerly CCIR-601, CCIR-656).
Y is Luminance, Cb is Blue Chromanance, and Cr is Red Chromanance. CCIR-601 defines an 8-bit DIGITAL 2's compliment coding for component video

RGB is the component format in which the primary colors (red, green, and blue) are transmitted as three independent components. The color, black and white signals are combined within these three signals. Only using RGB inputs requires separate horizontal and vertical sync inputs. RGB presents a better [TV] signal than the other forms of Component video, S-Video, Composite Video, or RS-170. RGB sends each signal on a separate cable and does not mix the color signals.

Rear Panel Sony BDP-N460 Blu-ray Player with Composite Video Connections
Component Video on a Blu-ray Player Rear Panel

The Component Video connections are the Green, Blue and Red RCA jacks.
While the Red, White and Yellow RCA jacks represent Composite Video connections.

{Video Bus top}

Composite Video

Single "Yellow" (shielded) RCA jack [75 ohm coax cable], which is not to be confused with the Audio (Red and White) jacks of the newer three cable systems, or just a single black wire in the older systems.
It's a composite of the black-and-white information (Y) and the color information (C).
Composite Video may also be called VBS [Video, Blanking and Syncs], or CVBS [Color, Video, Blanking, and Sync].
The video signal is on the yellow cable, while the white carries the left audio and the red carries the right audio.
S-Video is better than Composite Video, and Component Video is better than either of them.

 Composite Video Cable
Composite Video Cable
Rear Panel Composite Video Connections
Composite Video Connections

Although the Composite Video interface is still found on Audio-Visual gear as of 2010, you don't want to use it.
The next better video interface is S-Video [below], again the A/V gears needs to have the interface.
Of course if you have no other option than Composite video it is. However these days Composite Video is used a little differently.
The Composite Video interface is used in combination Component Video, as the audio input. Recall that Component Video is video only with no audio input.
So when you use Component Video between devices, you may also be using the white and red cables of Composite video to hold the left and right audio channels.

These days, the HDMI cable is the one you want. But you still need to retain compatibility with your old gear.

{Video Bus Index}


Digital Visual Interface [DVI] .. standard for high-speed, high-resolution digital displays. Developed by the Digital Display Working Group (DDWG).

Refer to the DVI page for additional info and connector pinout, signal names and a description.

Digital Video Broadcasting/Digital Audio-Visual Council (DVB/DAVIC), developed by DAVIC [inactive] and DVB [].
DVI has also been adopted by European Telecommunication Standards Institute (ETSI) and International Telecommunication Union (ITU)

DVI has a number of different types connectors:
DVI-D Digital only connector; 24 pins [modified D style]
DVI-I Digital and Analog [RGB]; 29 pins [modified D style]
DFP Digital only connector

DVI Video Cable
DVI Video Cable

You may still desire a DVI connector on a personal computer,
but on an A/V or TV system you want a HDMI connector.

{Video Bus top}


SCART: Euro-Audio/video connection system to BS 6552:1984 (EN 50-049).
The SCART interfaces provides the physical and electrical interconnection between two pieces of audio-visual gear.
May also be called "Euro", or "Perri" connector. The SCART connector pin out is shown in the table below.

Note that in these examples that the cable side is a male connector, and the device side is a female connector.
It's common for the unit side of the connector to be female, which protects the pins when no connection is made.
The cable end shows a straight cable connection, while the cable assembly below shows a right-angle connector.

Note the current usage of the SCART connector is unknown, the date in the standard indicates 1984.

Male SCART Connector at the end of a ribbon cable
SCART Connectors

SCART Vendors;

Foxconn {Single/Double Scart Connector, Right angle 42 pos}

Dual SCART Connectors on the rear panel of a unit
SCART Connectors

Two SCART female connectors.
SCART connectors as found on the back of a unit.
One used for a TV and one for a VCR.
The use of a VCR input may tend to date the picture.

Pin name Description Pin name Description
1 AOR Audio Out Right 2 AIR Audio In Right
3 AOL Audio Out Left + Mono 4 AGND Audio Ground
5 BGND RGB Blue Ground 6 AIL Audio In Left + Mono
7 B RGB Blue 8 SWTCH Audio, RGB switch,16:9
9 GGND RGB Green Ground 10 CLKOUT Clock Out
11 G RGB Green 12 DATA Data Out
13 RGND RGB Red Ground 14 DATAGND Data Ground
15 R RGB Red / Chrominance 16 BLNK Blanking Signal
17 VGND Composite Video Ground 18 BLNKGND Blanking Signal Ground
19 VOUT Composite Video Out 20 VIN Composite Video In, Luminance
21 SHIELD Chassis Ground, cable Shield - - -

{Video Bus top}


Serial digital interface [SDI] standard is based on a 270 Mbps transfer rate, over a single 75 ohm coaxial cable, up to 600 feet.
Serial Digital Interface is a digital broadcast television standard providing digital encoding of standard NTSC and PAL formats, with embedded audio. SDI is used in Television stations, cable channels, and professional production Equipment. Refer to the SDI page for more information.

SDI Cable
Serial Digital Interface Cable; 75 Ohm Coax

The coax cable shown above would also work as an analog antenna input as well.
Which would be the Tuner input or Antenna input on your TV.

{Video Bus Index}


Cable end of a male S-video connector

S-Video [Super-video] sends video signals over a multi-wire cable, dividing the video information into two separate [75 ohm coax or twisted pair cables] signals: one for luminance (Light) 'Y' and one for chrominance (Color) 'C'. Each signal is sent shielded, inclosed in a 4-pin Mini-DIN. S-Video is synonymous with Y/C "Component" video. However Y/C is the correct term, but the term S-Video is widely used to indicate the interface when in fact refers to a VCR tape format.
"S-video is a consumer form of component video used primarily with Hi8 and S-VHS".
The black rectangular pin is an alignment pin and does not carry a signal.
Graphic of a rear panel A/V receiver showing S-Video connectors

S-Video Cable Drawing .. S-Video Connector Pinout
S-Video Cable and Connector Pinout

Although S-video did work well in the latter days of VHS tape drives,
You really want to at least upgrade to Component Video [above].
Or better yet a digital interface like HDMI.

Sony STR-DE995 Receiver

In this particular Audio/Visual receiver [Sony STR-DE995] the S-video connectors are highlighted. This 5.1 A/V receiver uses S-video on five different video channels; TV, DVD, Video 1 and Monitor.
However this receiver has the option to also use Composite Video instead of S-video depending on the connections on the rest of the gear.

Around 2006 when this receiver was purchased S-Video was still in wide-spread usage. However even if S-Video was in decline by 2006, the interface would still be required to connect to other A/V gear in the system.
As of 2010 the HDTV purchased came with one S-Video interface, but a Blu-ray player did not.

{Video Bus top}

DisplayPort: The DisplayPort interface: is listed on its own page.

RS-170 EIA/TIA-170 Electrical Performance Standards - Monochrome Television Studio Facilities. RS170 is now listed on the RS-170 page.

High Definition Multimedia Interface, Refer to the HDMI page.
The High Definition Multimedia Interface HDMI cable supplies both high-definition video and multi-channel, digital audio for consumer Audio Visual [AV] entertainment equipment [HDTV, Amplifiers]. The HDMI interface is all digital, with no analog signals. HDMI is backward compatible with the DVI interface, but without the more advanced upgrades and no audio. Converters for HDMI to DVI cables are being produced. The HDMI cable is 5 meters in length and uses 28 AWG wire.

{Video Bus Index}

Computer Video Monitor Information Pages on this site

DFP [Digital Flat Panel] provides info and connector pinout descriptions
EVC [Enhanced Video Connector] page provides additional info and connector pin-out descriptions
EGA [Enhanced Graphics Adapter] is an obsolete but provided for reference.
XGA [eXtender Graphics Adapter] is an Out-dated but provided for reference.
VGA [Video Graphics Adapter] was made obsolete by the SVGA interface.
SVGA [Super Video Graphics Adapter] This is the current VGA standard that would be found on a PC.
PC Video Buses, which gives the video interfaces used on computers

ATSC "Advanced Television Systems Committee" []; Recommends specifications for Digital TV to the FCC []
SMPTE "Society of Motion Picture and Television Engineers"
VESA [] With FTP down-loads

Additional data:
DTVLink: DTV over IEEE-1394

NTSC [National Television System Committee] is used in US [and Japan]
PAL [Phase Alternation by Line] 50Hz, at 652 lines, is used outside the US
.... M-PAL [Phase Alternation by Line] is used outside the US [Brazil]
.... N-PAL [Phase Alternation by Line] is used outside the US
SECAM [Sequential Color with Memory] is used outside the US [France/Russia/Africa]

SCART Resources

SCART wiring examples and equipment sales
SCART on Wikipedia
More details and pinouts from

Modified 9/13/15
© 1998 - 2016 All rights reserved Larry Davis