Title text: The other side of USB-C is rotationally symmetric except that the 3rd pin from the top is designated FIREWIRE TRIBUTE PIN.
| This explanation may be incomplete or incorrect: Created by a FIREWIRE TRIBUTE PIN. Should include a column for the actual purpose of the pin. Do NOT delete this tag too soon.|
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Electronics connecters are designed to transport both information and power. A pinout diagram describes the function of each pin such as to communicate data, transport power, physical function (keying), etc. In this comic there is an absurd alternative to the actual pins used in connectors.
|Label||Explanation||Pin No.||Actual purpose|
|+3.3V DC||3.3V is a typical voltage in digital electronics. The "+" Indicates a||1||TMDS Data2+|
|Data||Most digital communications cables contain at least one wire that carries data. Typically there will be a more descriptive name if there are multiple data pins.||2||TMDS Data2 Shield|
|-3.3V DC||Negative voltages were used more frequently in the past, however modern systems typically generate any negative voltages they might require internally from the given positive voltages.||3||TMDS Data2-|
|+5V||Many actual pin configurations use +5 volts to supply power to a device. That's not what this means.||4||TMDS Data1+|
|Tx||"Tx" typically refers to pins used to transmit as opposed to "Rx"/receive||5||TMDS Data1 Shield|
|+6VI||V is usually used to represent volts, but here, VI represents the Roman numeral 6. (See Pin 4)||6||TMDS Data1-|
|Wx||"Wx" does not typically exist in the "Tx"/"Rx" scheme. In the weather forecasting community, Wx means "weather" .||7||TMDS Data0+|
|+7VII||V is usually used to represent volts, but here, VII represents the Roman numeral 7, continuing the pattern from above.||8||TMDS Data0 Shield|
|Rx Only||"Rx" typically refers to pins used to receive as opposed to "Tx"/transmit. In this case "Rx" is used as part of a pun on "Rx (prescription) only"||9||TMDS Data0-|
|Antidata||Some ports use differential signaling, where a signal and its inverse are sent over a pair of pins (e.g. D+ and D-). This mixes that practice with a humorous reference to the notion of matter versus antimatter. There is no such thing as antidata.||10||TMDS Clock+|
|Unknown||Occasionally extra pins will be included for future use, however they will typically be labeled "reserved" to point out that their usage is not yet defined.||11||TMDS Clock Shield|
|Water||Labs often have ports connecting to common supplies of various supplying (Oxygen, water, fuel, vacuum).||12||TMDS Clock-|
|+240V DC||High voltage DC is not typically used in small communications connectors. It would need to be low current to avoid generating excess heat.||13||CEC|
|Vacuum||Labs often have ports connecting to common supplies of various supplying (Oxygen, water, fuel, vacuum).||14||Reserved (1.0-1.3a), Utility (1.4+, optional)|
|5V AC||Pins often supply low voltage direct current to devices. This pin supplies 5V alternating current, which is not typically supplied.||15||SCL (I²C serial clock for DDC)|
|Amazon Copyright Pin||HDMI can optionally be protected by a digital rights management (DRM) scheme, known as HDCP. This pin humorously implies the presence of a different DRM scheme specific to Amazon.com, 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).||16||SDA (I²C serial data for DDC)|
|GND||GND typically refers to "ground" on pinout diagrams. Remarkably, this is correct.||17||DDC/CEC Ground|
|Decorative||Decorative elements are pieces of an assembly that serve only an aesthetic purpose without any technical function. This would not be particularly useful inside a connector, as almost no one will ever see it--however, in HDMI, pin 14 was reserved for future use in versions 1.0–1.3a (and was only assigned an official use in 1.4).||18||+5V|
|Ground||Compared to Pin 17 ("GND"), this appears to be the same ground pin. However, the presence of both GND and Ground seems to imply that GND represents something other than the standard "ground" pin. Some systems have different grounds for analog and digital sections, but they would typically be disambiguated by terms like AGND.||19||Hot Plug Detect|
HDMI uses four pairs of shielded twisted-pair connectors, along with seven other connectors. (Twisted-pair means a wire is wrapped with the other wire that returns the current to the original device, thus minimizing electromagnetic noise. Shielding refers to wrapping a cable with a conductor to absorb the energy of noise.) Three of these pairs are for data (TMDS Data0, Data1, and Data2) and the other is a clock. These pairs take up three pins as one of them is a ground pin for the shielding wrapped around each pair. TMDS stands for "Transition-minimized Differential Signaling" and is also used in the DVI standard.
DDC stands for "Display Data Channel" and is based on the I²C serial standard. It is used to allow the transmitting device to learn what formats of data the receiving device can accept.
CEC stands for "Consumer Electronics Control" and is supposed to allow a single remote control to control multiple devices.
"Hot Plug Detect" refers to hot-plugging, where a cable is connected to a device already turned on. The device should then ideally detect that the cable has been plugged in and respond appropriately.
A ground pin is commonly found on USB and other pin connectors. At least one ground is necessary to complete the circuit, and some cables use multiple ground lines to distribute current or to support twisted pairs. However, there is no purpose served by having many more ground pins than data pins. Therefore, it seems rather silly for the micro USB to have 4 ground pins and only 1 functional "USB" pin. It also does not give much information about what the "USB" pin would do, as opposed to a standard pinout diagram. This diagram also leaves out the +5V power pin that is present in the real micro USB connector, which would render most USB peripherals unable to function.
|GND||A ground pin|
|GND||A second ground pin|
|GND||A third ground pin|
|USB||Apparently the only data pin in this connector.|
|GND||A fourth ground pin. A real micro USB only has one ground pin.|
|+5V DC||A common electronics supply voltage.|
|+3.3V DC||Another common electronics supply voltage. This pin is not present on USB type C, mostly because the voltage is too low to supply useful levels of power at the current limit of the pins.|
|+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.|
|Boobytrap Pin (Pure Solder)||Solder is a metal alloy with a low melting temperature, used to bond electronic components together permanently. Making a connector pin out of it would likely result in the pin overheating and melting, thus bonding the connector to its receptacle, and thereby "trapping" the receptacle.|
|Mechanical||All connectors include portions whose job is to ensure a solid connection between the cable and the port. This is typically not the job of the pins, however. In real USB type C connectors, this task is performed by the center tongue of the female connector.|
|+3.3eV/C||Electron-volts per coulomb would be a very unusual unit to see in a pinout. It is equivalent to volts, however, so technically this pin would be a +3.3V pin.|
|Candlepin||Randall is making a pun on the word pin, which refers to a electrical connector pin as well as a thing to knock down in bowling. Candlepin bowling is a form of bowling.|
|Facebook use||This would imply that Facebook had a hand in specifying USB type C, and had a pin dedicated to their use. This would be strange given Facebook's primary business is web technology and would have little need for a dedicated pin in the USB standard.|
|+5V (Positrons)||Positrons are the antimatter counterparts to electrons. So this pin is supplying +5V, but does so by sourcing positrons into the device rather than sinking electrons out. NOTE: Positrons cannot be conducted through normal matter conductors as they would annihilate with the electrons.|
|Pin Roulette||Presumably in the same vein as "Chat Roulette", this pin's purpose is not rigidly defined and is instead left to chance. According to the title text, this pin's counterpart on the other side of the connector is the "FireWire Tribute Pin", so this cable would only be truly rotationally symmetric (which is the whole point of the USB-C connector) when the pin roulette ball lands on that same function.|
|GND||Ground pin. Typically denoted as "GND".|
|SKY||Reference to the ground pin, which refers to the common grounding on the larger metal body. There is no corresponding "sky" pin, although sky is often thought as the opposite of ground.|
|FireWire Tribute Pin||In Title text: FireWire is Apple's version of IEEE 1394 which is a 6 pin connector that has a ground pin a power pin and two pairs of data pins. It was something of a competitor to USB, and had faster data rates than USB 2.0, but is much less popular now. Presumably the writers of the USB-C standard (which far outpaces its data rates) wished to memorialize it somehow, although it's not clear how the pin actually works for that purpose.|
|Pin||An 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.|
- [Caption at top]
- Quick Reference Guide
- [Four common connectors are depicted - vertically, rather than the usual horizontal orientation.]
- [The first connector is a 19-pin HDMI connector.]
- [The nine pins on the left are labeled:]
- Amazon Copyright Pin
- [The ten pins on the right are labeled:]
- +3.3V DC
- -3.3V DC
- Rx Only
- +240V DC
- 5V AC
- [The second connector is a 5-pin Micro USB connector.]
- [The five pins are labeled:]
- [The third connector is a 24-pin USB-C connector, with only the right side labeled.]
- [The twelve pins on the right are labeled:]
- +5V DC
- +3.3V DC
- +120V AC
- Boobytrap Pin (Pure Solder)
- Facebook Use
- +5V (Positrons)
- Pin Roulette
- [The fourth and final connector is a 1-pin COAX connector.]
- [The one pin in the center is labeled:]
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