2317: Pinouts - Revision history

42.book.addict: added Category:DRM using HotCat

2025-01-22T18:09:24Z

added Category:DRM using HotCat

Whoop whoop pull up: /* HDMI */

2024-09-28T00:15:36Z

‎HDMI

172.71.242.176: /* Explanation */ puncs

2024-05-03T14:20:46Z

‎Explanation: puncs

172.70.100.169 at 22:42, 2 May 2024

2024-05-02T22:42:06Z

Pie Guy: /* USB-C */ the magic smoke is how electronics work

2023-11-14T18:48:38Z

‎USB-C: the magic smoke is how electronics work

172.70.215.3 at 18:36, 9 November 2023

2023-11-09T18:36:07Z

ChristmasGospel: Edit by ClassicalGames

2023-05-09T03:44:15Z

Edit by ClassicalGames

Jacky720: rv

2022-05-04T21:08:54Z

Show changes

Ex Kay Cee Dee at 20:21, 4 May 2022

2022-05-04T20:21:19Z

Show changes

Davidy22: Reverted edits by X. K. C. D. (talk) to last revision by NotaBene

2022-05-04T02:10:07Z

Reverted edits by X. K. C. D. (talk) to last revision by NotaBene

Show changes

← Older revision		Revision as of 18:09, 22 January 2025
Line 297:		Line 297:
	{{comic discussion}}		{{comic discussion}}
	[[Category:Computers]]		[[Category:Computers]]
		+	[[Category:DRM]]

@@ Line 79: / Line 79: @@
 | +240V DC
 | This is a reference to heavy-duty home and commercial appliances, which use 240V AC for power. Additionally, many cable specifications try to provide a way to power devices over them (PS/2, USB, Power over Ethernet,) but these small communication cables usually carry only DC and not AC electricity.
-High voltage power is only sometimes used in small communications connectors. It might help to keep the current of power lines low to avoid generating excess heat. With +240V DC inside the HDMI cable, monitors would not need any longer a separate power plug. This is similar to Power-over-Ethernet, which does not exceed 60V, or ISDN, which goes up to 110V depending on country, and helps surveillance cameras or telephones to work with one connecting cable only. But with this much voltage on such a small cable, a short could lead more likely to melting the insulation and wiring in a sudden burst of toxic smoke. The produced thermal power through a short with resistance R_short that is building up is U²/R_short, increasing with the square of the voltage (also the breakdown voltage of the isolation is more easily reached). However, a high voltage reduces the chance of a peripheral drawing too much current, which could cause a fire on thin wires otherwise: The current through the cable for a device, needing a given power of P, is I = P_dev/U, the thermal power of the cables with resistance R is P_cables = R_cables*I² = R_cables*P_dev²/U², so it is reduced by the square of the voltage.
+High voltage power is only sometimes used in small communications connectors. It might help to keep the current of power lines low to avoid generating excess heat. With +240V DC inside the HDMI cable, monitors would not need any longer a separate power plug. This is similar to Power-over-Ethernet, which does not exceed 60V, or ISDN, which goes up to 110V depending on country, and helps surveillance cameras or telephones to work with one connecting cable only. But with this much voltage on such a small cable, a short could lead more likely to melting the insulation and wiring in a sudden burst of toxic smoke. The produced thermal power through a short with resistance R_short that is building up is U²/R_short, increasing with the square of the voltage (also the breakdown voltage of the insulation is more easily reached). However, a high voltage reduces the chance of a peripheral drawing too much current, which could cause a fire on thin wires otherwise: The current through the cable for a device, needing a given power of P, is I = P_dev/U, the thermal power of the cables with resistance R is P_cables = R_cables*I² = R_cables*P_dev²/U², so it is reduced by the square of the voltage.
 | 13
 | CEC

@@ Line 63: / Line 63: @@
 |-
 | 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.
+| 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
 | TMDS Clock+
@@ Line 235: / Line 235: @@
 === 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) {{Citation needed}}, 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.
+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),{{Citation needed}} 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==

@@ Line 235: / Line 235: @@
 === 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), 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.
+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) {{Citation needed}}, 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==

@@ Line 173: / Line 173: @@
 |-
 | +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, 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.
+| 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, letting out the {{w|magic smoke}} and melting the metal together such that the cable likely couldn't be removed. 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
 | Rx2-

@@ Line 94: / Line 94: @@
 |-
 | Amazon Copyright Pin
-| 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.
+| HDMI can optionally be restricted by a {{w|digital rights management|digital restrictions 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
 | SDA (I²C serial data for DDC)

@@ Line 89: / Line 89: @@
 |-
 | 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 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 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
 | SCL (I²C serial clock for DDC)