Editing 2317: Pinouts
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| Antidata | | Antidata | ||
− | | Some ports use differential signaling, where a signal and its inverse are sent over a pair of pins (e.g. D+ and D-). The combined signal is more robust to interference. This mixes that practice with a humorous reference to the notion of matter versus antimatter. Currently there is no such thing as antidata | + | | Some ports use differential signaling, where a signal and its inverse are sent over a pair of pins (e.g. D+ and D-). The combined signal is more robust to interference. This mixes that practice with a humorous reference to the notion of matter versus antimatter. Currently there is no such thing as antidata{{Citation needed}}. Antidata pins could be needed in the future as low-entropy or high-entropy source in quantum communication connectors to securely dispose of data. |
| 10 | | 10 | ||
| TMDS Clock+ | | TMDS Clock+ | ||
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| 5V AC | | 5V AC | ||
− | | Pins often supply low voltage direct current to devices. This pin supplies 5V {{w|alternating current}}, which is not typically supplied. AC is used in {{w|Electric power transmission|electrical transmission}} because it can be stepped up to high voltage to minimize transmission losses, then stepped down to more useful voltages right before loads. DC power is required for logic circuitry like in computers. Conversion between the two kinds of power everywhere would make for transformers being embedded in most modern devices, taking extra materials to manufacture and losing a significant percentage of all electricity in the conversion. Having both is not entirely unheard of: the Commodore 64 power supply provides both DC, for the logic of the motherboard; and AC, for powering the tape drive. | + | | Pins often supply low voltage direct current to devices. This pin supplies 5V {{w|alternating current}}, which is not typically supplied. AC is used in {{w|Electric power transmission|electrical transmission}} because it can be stepped up to high voltage to minimize transmission losses, then stepped down to more useful voltages right before loads. DC power is required for logic circuitry like in computers. Conversion between the the two kinds of power everywhere would make for transformers being embedded in most modern devices, taking extra materials to manufacture and losing a significant percentage of all electricity in the conversion. Having both is not entirely unheard of: the Commodore 64 power supply provides both DC, for the logic of the motherboard; and AC, for powering the tape drive. |
| 15 | | 15 | ||
| SCL (I²C serial clock for DDC) | | SCL (I²C serial clock for DDC) | ||
|- | |- | ||
| Amazon Copyright Pin | | Amazon Copyright Pin | ||
− | | HDMI can optionally be | + | | HDMI can optionally be protected by a {{w|digital rights management}} (DRM) scheme, known as {{w|High-bandwidth Digital Content Protection|HDCP}}. This pin humorously implies the presence of a different DRM scheme specific to {{w|Amazon (company)|Amazon}} the company, as well as poking fun at the fact that copyright is an explicit part of the HDMI protocol (although it is not assigned to a specific pin). This is likely a reference to how chips and cables and specifications often have specific strange additions or functionality in them to meet the requests of various bodies invested in the design process: additionally after reverse engineering many strange things have been found laying around in the functionality of hardware that do unexpected special things. |
| 16 | | 16 | ||
| SDA (I²C serial data for DDC) | | SDA (I²C serial data for DDC) | ||
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| +120V AC | | +120V AC | ||
− | | Residential supply voltage in the United States; its use on an electronics connector would be very unusual, as it would burn out any unguarded transistor-logic electronics, | + | | Residential supply voltage in the United States; its use on an electronics connector would be very unusual, as it would burn out any unguarded transistor-logic electronics, producing smoke and melting the metal together such that the cable likely couldn't be removed. But this high a voltage might be an allusion to the high voltages USB-C screens and similar devices can request in order to get enough energy without exceeding the cable's current limit. |
| A10 | | A10 | ||
| Rx2- | | Rx2- | ||
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=== Coax === | === Coax === | ||
− | A {{w|RF connector|coaxial RF connector}} has two contacts - one pin, and the shield; typically the whole connector is labeled with whatever function/signal is carried by the pair. The joke here is that the label is ''technically'' correct (the best kind of correct), | + | A {{w|RF connector|coaxial RF connector}} has two contacts - one pin, and the shield; typically the whole connector is labeled with whatever function/signal is carried by the pair. The joke here is that the label is ''technically'' correct (the best kind of correct), but not very useful to the end user, as it does not specify the voltage rating, impedance, connector size, or other useful information about the cable. Some serial data transmission systems, such as {{w|Ethernet|Ethernet}}, used coaxial cable early on as a low cost, widely available solution, however most of these have largely become obsolete. A common coaxial cable still widely in use is {{w|RG-6|RG-6}}, which is typically used to deliver satellite television, cable television, and cable Internet services in the United States and Canada. |
==Transcript== | ==Transcript== |