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SCART
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=== Cables === The cables for connecting equipment together have a male plug at each end. Some of the wires such as ground, data, switching and RGB connect to the identical pin number at each end. Others such as audio and video are swapped so that an output signal at one end of the cable connects to an input signal at the other end. The complete list of wires that are swapped are: pins 1 and 2, pins 3 and 6, pins 17 and 18, pins 19 and 20. The original SCART specification provided for different cable (cordset) types denoted by a key color, but color-coding is rarely used and cables often use different, non-standard configurations. {| class="wikitable" |- ! colspan="2" | Type ! Ring color ! Pins ! Description ! Symmetric |- | '''U''' | Universal | black | 1β20, 21 | Fully wired cable. | no |- | '''V''' | Video only | white | 17β20, 21 | Only composite wires. | yes |- | '''C''' | Combined | grey | 1β4, 6, 17β20, 21 | Composite Video and Audio | yes |- | '''A''' | Audio only | yellow | 1β4, 6, 21 | Audio | yes |- | '''B''' | Bus | green | 10, 12, 21 | Only data connections | Depends on protocol used |} Maximum SCART cable length is estimated to be about 10 to 15 metres without amplification.{{Citation needed|date=January 2009}} Due to the relatively high signal voltages used in SCART, "hot plugging" (connecting or disconnecting devices while they are on) is not recommended. Although there is no risk of personal injury, there is the possibility of damaging electronics within the devices if the connector is inserted improperly.{{Citation needed|date=January 2009}} Also, since many TVs are [[appliance classes|Class II]] (double-insulated) rather than earthed, the large exposed shield on the SCART connector will be held at approximately half mains voltage if it is plugged into a powered TV with the other end unplugged. If the cable is then plugged into an earthed device with a metal case, inadvertent contact with the SCART cable shield while the earthed device is touched with the other hand can cause a painful electric shock. For this reason the device end of the cable should always be plugged in first and the TV end plugged in last.<ref>{{cite web|url=http://www.diynot.com/forums/viewtopic.php?t=11972 |title=Electric shock off aerial coax |date=7 August 2004 |publisher=DIYnot.com |access-date=2012-06-15}}</ref><ref>{{cite web|url=http://www.dtg.org.uk/dtg/press_releases/dtg_napit_201110.pdf|title=Guide to preventing shocks from entertainment systems|work=Digital TV Group|url-status=dead|archive-url=https://web.archive.org/web/20160306172331/http://dtg.org.uk/dtg/press_releases/dtg_napit_201110.pdf|archive-date=March 6, 2016|access-date=15 June 2012}}</ref><ref>{{cite web|url=http://www.chatzones.co.uk/cgi-bin/discus/show.cgi?tpc=5557&post=15775#POST15775|title=:: EPE Chat Zone :: Radio Bygones Message Board ::: SCART Shock|publisher=Chatzones.co.uk|url-status=dead|archive-url=https://web.archive.org/web/20160416195814/http://www.chatzones.co.uk/cgi-bin/discus/show.cgi?tpc=5557&post=15775|archive-date=April 16, 2016|access-date=2012-06-15}}</ref> Quality differences exist in SCART cables. While a proper SCART cable uses miniature [[coaxial cable]]s for the video signals, cheap SCART cables often use plain wires for all signals, resulting in a loss of image quality and greatly reducing the maximum cable length. A common problem on a cheap SCART cable is that a TV outputs a composite video signal from its internal tuner and this is induced or [[crosstalk]]ed onto an incoming video signal due to inadequate or non-existent screening; the result is ghostly images or shimmering superimposed on the incoming signal. To non-destructively verify if a SCART cable uses coaxial cables, unscrew the [[strain relief]] at the SCART connector and fold open the plastic shell. Using higher-quality cables such as those with ribbon cords that have properly shielded coaxial cables inside might help in reducing a 'ghosting' effect, but it does not always eliminate it due to various factors. A more permanent method is to remove pin 19 (Video Out) from the SCART plug that is put into the TV, preventing a signal from being broadcast by the TV into the cable, so it cannot cross-talk with the incoming signal.
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