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Ghosting occurs when impedance mismatches cause signals to be reflected. A correctly impedance matched cable (75 ohm) should prevent this, however, ghosting with long cables may be caused by equipment with incorrect signal termination or by passive cable splitters rather than the cables themselves. Some laptops and other portable devices in the early to mid-2000s contained a two-row mini-VGA connector that is much smaller than the three-row DE-15 connector, as well as five separate BNC connectors. The VGA interface includes no affordances for hot swapping, the ability to connect or disconnect the output device during operation, although in practice this can be done and usually does not cause damage to the hardware or other problems. The VESA DDC specification does, however, include a standard for hot-swapping. [5] PS/2 signaling [ edit ] For conversions to and from digital formats like HDMI or Displayport, a scan converter is required. VGA outputs to interfaces with different signaling, more complex converters may be used. Most of them need an external power source to operate and are inherently lossy. However, many modern displays are still made with multiple inputs including VGA, in which case adapters are not necessary. VESA Enhanced Display Data Channel Standard Version 1.1. Video Electronics Standards Association. 24 March 2004. p.18.
VGA extension cable, VGA Male to Female Cable,1.8 BENFEI VGA extension cable, VGA Male to Female Cable,1.8
VESA DDC/CI Standard Version 1.1. 2004. p.31. DDC/CI supports hot plugging, provided the display can detect a disconnection of the video cable Find sources: "VGA connector"– news · newspapers · books · scholar · JSTOR ( December 2016) ( Learn how and when to remove this template message) With the implementation of the VESA DDC specification, several of the monitor ID pins were reassigned for use by DDC signaling, and the key pin was replaced with a +5V DC output per the DDC spec. Devices that comply with the DDC host system standard provide 5 V ± 5%, from 50 mA to 1 A. [7] PS/55 signaling [ edit ]
Devices continue to be manufactured with VGA connectors, although newer digital interfaces such as DVI, HDMI and DisplayPort are increasingly displacing VGA, and many modern computers and other devices do not include it. [3] Physical design [ edit ]
What Is VGA? (Definition of Video Graphics Array) - Lifewire
Some high-end monitors and video cards used multiple BNC connectors instead of a single standard VGA connector, [ which?] providing a higher quality connection with less crosstalk [10] by utilising five separate 75 ohm coaxial cables. Whether you want to build your own home theater or just learn more about TVs, displays, projectors, and more, we've got you covered. Engst, Adam; Pogue, David (23 November 1999). Crossing Platforms – A Macintosh/Windows Phrasebook: A Dictionary for Strangers in a Strange Land. O'Reilly Media. ISBN 978-1-4919-1679-7 . Retrieved 16 February 2021. This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. ( April 2021) ( Learn how and when to remove this template message) Other connectors have been used to carry VGA-compatible signals, such as mini-VGA or BNC, but " VGA connector" typically refers to this design. [2]While shorter VGA cables are less likely to introduce significant signal degradation, good-quality cable should not suffer from signal crosstalk (whereby signals in one wire induce unwanted currents in adjacent wires) even at greater lengths. All VGA connectors carry analog RGBHV (red, green, blue, horizontal sync, vertical sync) video signals. Modern connectors also include VESA DDC pins, for identifying attached display devices. Some pins on the connector were also different: pin 9 was keyed by plugging the female connector hole, and four pins carried the monitor ID. [6] This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.
VGA connector - Wikipedia
A VGA extender is an electronic device that increases the signal strength from a VGA port, most often from a computer. They are often used in schools, businesses, and homes when multiple monitors are being run off one VGA port, or if the cable between the monitor and the computer will be excessively long (often pictures appear blurry or have minor artifacts if the cable runs too far without an extender). VGA extenders are sometimes called VGA boosters.What is the VGA connector and how to use it". Tyfon Tech. 8 February 2018 . Retrieved 26 July 2022. Within a 15-pin connector, the red, green, and blue signals (pins 1, 2, 3) cannot be shielded from each other, so crosstalk is possible within the 15-pin interconnect. BNC prevents crosstalk by maintaining full coaxial shielding through the circular connectors, but the connectors are very large and bulky. The requirement to press and turn the plug shell to disconnect requires access space around each connector to allow grasping of each BNC plug shell. Supplementary signals such as DDC are typically not supported with BNC.
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