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09-28 19:54
http://en.wikipedia.org/wiki/DisplayPort
Pin 20 DP_PWR Power for connector (3.3 V 500 mA)


Full-size DisplayPort connector
The standard DisplayPort connector (now generally called "full-size" to distinguish it from the mini connector) was the sole connector type introduced in DisplayPort 1.0.
It is a 20-pin single-orientation connector with a friction lock and an optional mechanical latch.
The standard DisplayPort receptacle has dimensions of 16.10 mm (width) ¡¿ 4.76 mm (height) ¡¿ 8.88 mm (depth).

The standard DisplayPort connector pin allocation is as follows:

12 pins for the main link — the main link consists of four shielded twisted pairs. Each pair requires 3 pins; one for each of the two wires, and a third for the shield.
3 pins for the auxiliary channel — the auxiliary channel uses another 3-pin shielded twisted pair (pins 15–17)
1 pin for HPD — hot-plug detection pin (pin 18)
2 pins for power — 3.3 V power and return line (pins 19 and 20)
2 additional ground pins — (pins 13 and 14)


DP_PWR Pin
Pin 20 on the DisplayPort connector, called DP_PWR, provides 3.3 V (¡¾10%) DC power at up to 500 mA (minimum power delivery of 1.5 W).
This power is available from all DisplayPort receptacles, on both source and display devices.
DP_PWR is intended to provide power for adapters, amplified cables, and similar devices, so that a separate power cable is not necessary.

Standard DisplayPort cable connections do not use the DP_PWR pin.
Connecting the DP_PWR pins of two devices directly together through a cable can create a short circuit which can potentially damage devices, since the DP_PWR pins on two devices are unlikely to have exactly the same voltage (especially with a ¡¾10% tolerance).
For this reason, the DisplayPort 1.1 and later standards specify that passive DisplayPort-to-DisplayPort cables must leave pin 20 unconnected.

However, in 2013 VESA announced that after investigating reports of malfunctioning DisplayPort devices, it had discovered that a large number of non-certified vendors were manufacturing their DisplayPort cables with the DP_PWR pin connected:

Recently VESA has experienced quite a few complaints regarding troublesome DisplayPort operation that ended up being caused by improperly made DisplayPort cables.
These "bad" DisplayPort cables are generally limited to non-DisplayPort certified cables, or off-brand cables.
To further investigate this trend in the DisplayPort cable market, VESA purchased a number of non-certified, off-brand cables and found that an alarmingly high number of these were configured improperly and would likely not support all system configurations.
None of these cables would have passed the DisplayPort certification test, moreover some of these cables could potentially damage a PC, laptop, or monitor.

The stipulation that the DP_PWR wire be omitted from standard DisplayPort cables was not present in the DisplayPort 1.0 standard. However, DisplayPort products (and cables) did not begin to appear on the market until 2008, long after version 1.0 had been replaced by version 1.1. The DisplayPort 1.0 standard was never implemented in commercial products.


DP_PWR ÇÉ
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ÀÌ Àü¿øÀº ¼Ò½º ¹× µð½ºÇ÷¹ÀÌ ÀåÄ¡ÀÇ ¸ðµç DisplayPort ¼ÒÄÏ¿¡¼­ »ç¿ëÇÒ ¼ö ÀÖ½À´Ï´Ù.
DP_PWRÀº ¾î´ðÅÍ, ÁõÆø µÈ ÄÉÀÌºí ¹× À¯»çÇÑ ÀåÄ¡¿¡ Àü¿øÀ» °ø±ÞÇϱâÀ§ÇÑ °ÍÀ̹ǷΠº°µµÀÇ Àü¿ø ÄÉÀ̺íÀÌ ÇÊ¿äÇÏÁö ¾Ê½À´Ï´Ù.

Ç¥ÁØ DisplayPort ÄÉÀÌºí ¿¬°áÀº DP_PWR ÇÉÀ» »ç¿ëÇÏÁö ¾Ê½À´Ï´Ù.
ÄÉÀ̺íÀ» ÅëÇØ µÎ ÀåÄ¡ÀÇ DP_PWR ÇÉÀ» Á÷Á¢ ¿¬°áÇϸé ÀåÄ¡°¡ ¼Õ»ó µÉ ¼öÀÖ´Â ´Ü¶ôÀÌ ¹ß»ýÇÒ ¼ö ÀÖ½À´Ï´Ù. µÎ ÀåÄ¡ÀÇ DP_PWR ÇÉÀÌ Á¤È®È÷ µ¿ÀÏÇÑ Àü¾ÐÀ» °¡Áú °¡´É¼ºÀÌ ¾ø±â ¶§¹®ÀÔ´Ï´Ù (ƯÈ÷ ¡¾ 10 % Çã¿ë ¿ÀÂ÷).
ÀÌ·¯ÇÑ ÀÌÀ¯·Î DisplayPort 1.1 ¹× ÀÌÈÄ Ç¥ÁØÀº ¼öµ¿ DisplayPort-DisplayPort ÄÉÀ̺íÀÌ ÇÉ 20À» ¿¬°áµÇÁö ¾ÊÀº ä·Î µÎ¾î¾ßÇÑ´Ù°í ±ÔÁ¤ÇÕ´Ï´Ù.

±×·¯³ª 2013 ³â¿¡ VESA´Â DisplayPort ÀåÄ¡ÀÇ ¿ÀÀÛµ¿¿¡ ´ëÇÑ º¸°í¼­¸¦ Á¶»çÇÑ °á°ú DP_PWR ÇÉÀ» ¿¬°á ÇÑ ¸¹Àº ºñ °øÀÎ °ø±Þ ¾÷ü°¡ DisplayPort ÄÉÀ̺íÀ» Á¦Á¶ÇÏ°í ÀÖÀ½À» ¹ß°ßÇß½À´Ï´Ù.

ÃÖ±Ù VESA´Â DisplayPort ÄÉÀ̺íÀ» ºÎÀûÀýÇÏ°Ô Á¦ÀÛÇÏ¿© ¹ø°Å·Î¿î DisplayPort ÀÛµ¿¿¡ °üÇÑ ºÒ¸¸À» °Þ¾ú½À´Ï´Ù.
ÀÌ·¯ÇÑ "ºÒ·®"DisplayPort ÄÉÀ̺íÀº ÀϹÝÀûÀ¸·Î DisplayPort°¡ ¾Æ´Ñ ÄÉÀÌºí ¶Ç´Â ºê·£µå ÄÉÀ̺í ÀÌ¿ÜÀÇ ÄÉÀ̺í·Î Á¦Çѵ˴ϴÙ.
DisplayPort ÄÉÀÌºí ½ÃÀå¿¡¼­ ÀÌ·¯ÇÑ Ãß¼¼¸¦ ´õ ÀÚ¼¼È÷ Á¶»çÇϱâ À§ÇØ VESA´Â ÀÎÁõµÇÁö ¾ÊÀº ¿ÀÇÁ ºê·£µå ÄÉÀ̺íÀ» ¿©·¯ °³ ±¸ÀÔÇßÀ¸¸ç ³î¶ø°Ôµµ ¸¹Àº ¼öÀÇ ÄÉÀ̺íÀÌ ºÎÀûÀýÇÏ°Ô ±¸¼ºµÇ¾úÀ¸¸ç ¸ðµç ½Ã½ºÅÛ ±¸¼ºÀ» Áö¿øÇÏÁö ¾ÊÀ» ¼ö ÀÖ½À´Ï´Ù.
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