But if you want to go the other way round, you will need to dive a whole lot deeper into your pockets. The reason? And is there a difference between consumer and professional use? In this article, we explore the complete reasoning. As already explained in a previous article , DisplayPort and HDMI were created by different consortiums, with different applications in mind.
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To avoid frustration, we must carefully consider DisplayPort signal path conversion early on, during AV system design. A user connects to the wall-plate using DisplayPort, selects the correct Input on the display, and they are off and running — right?
Not so fast; there needs to be a conversion from DisplayPort to HDMI somewhere, and if that converter is not in the right place it will not work. This often causes frustration and misplaced blame. You might think why not just put that converter behind the display, right at the HDMI input port so the user does not see it or behind the wall-plate, but you would be wrong.
You should not use an adapter to convert DisplayPort to HDMI anywhere in the signal chain other than right at the source. Most DisplayPort cables do not have this pin or it is not connected inside the cable because it will cause a short-circuit when connecting source to sink.
It does have a dual-mode version that will support TMDS in compatibility mode. DisplayPort signals operate at 3. These adapters are powered by pin 20 in the DisplayPort receptacle, and can only be used right at the source device — if they are used with a DisplayPort cable in front of them, the signal does not get converted because no power is available on the DisplayPort cable pin This conversion process uses more current than the power pin on the receptacle can provide and must be an externally powered adapter.
The DisplayPort and HDMI device receptacles both provide limited power on a single pin to power some external devices such as adapters, converters, active cables, and basic switches. A wall-plate, patch cable, or table cubby jack breaks this power signal chain. You cannot use an HDMI cable with built-in extender in most situations because they draw power from the missing pin.
The HDMI specification for source and sink devices provides 5v power on pin DisplayPort specification is 3. Most cables do not have this pin — it is missing. Look at any reputable HDMI or DisplayPort cable and see for yourself — there is either no contact on one of the corner pins or that pin is not electrically connected.
Damage can occur to the connected devices if this pin is electrically connected and some of the off-brand cables do just that. Any time a reputable patch cable is used in the signal path this power connection is broken as it should be.
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