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Port & Cable

The question index

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Find the distinction you need, then follow the exact reference. Connector forms, technology capabilities and named-device requirements stay separate.

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59 guides / 9 subjects · Each guide appears once. Subjects and questions follow their original order, not popularity.

11 guides

USB & Thunderbolt

Names, cable markings, charging and exact port roles.

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Jump to a question 11 in this subject

Reference question

Does USB-C mean USB 3, USB4 or Thunderbolt?

Short answer No. USB-C is only the connector shape; USB 3, USB4 or Thunderbolt support depends on the exact port and cable.

Separate the USB-C connector shape from the USB generation, USB4, Thunderbolt, video and charging capabilities implemented by a particular port or cable.

Related record types: Connector form · Technology standard · Cable / adapter reference

Related reading 17 references

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Reference question

Why does a USB-C cable charge but not carry a display?

Short answer Charging and video are separate features; a cable or port can support power without display output.

Treat charging and display transport as separate capabilities instead of assuming one successful USB-C function proves every other function.

Related record types: Connector form · Cable / adapter reference

Related reading 16 references

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Reference question

Why can two USB-C cables support different speeds?

Short answer Because USB-C ends do not fix a cable’s capability: data mode, Thunderbolt support, construction and length vary by cable.

Use USB-C only as an endpoint description; data generation, Thunderbolt support, construction, length and exact-product capability remain separate.

Related record types: Connector form · Technology standard · Cable / adapter reference

Related reading 17 references

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Reference question

Are all USB-C cables the same for charging?

Short answer No. Charging depends on the exact cable, charger and device, not on the USB-C ends.

Keep the connector form separate from cable-specific charging/current evidence and the exact devices participating in power negotiation.

Related record types: Connector form · Technology standard · Cable / adapter reference

Related reading 13 references

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Reference question

How do USB-C cable power and data markings differ?

Short answer Watts describe charging power, not data speed, and a missing speed label does not prove the cable has no data.

Read watts and data rates independently; a power-only USB 2 marking is not a no-data verdict.

Related record types: Connector form · Cable / adapter reference

Related reading 7 references

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Reference question

Is an e-marked USB-C cable necessarily active?

Short answer No. E-marker chips are used in passive cables too, so an e-marker does not make a cable active.

An electronic marker and signal-conditioning electronics answer different questions.

Related record types: Connector form · Cable / adapter reference

Related reading 8 references

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Reference question

Does a 120 Gbps Thunderbolt 5 cable mean 120 Gbps both ways?

Short answer No. It is 80 Gbps each way, or 120 Gbps one way and 40 the other for display-heavy use.

Keep balanced links, display-driven bandwidth boost and application throughput separate.

Related record types: Connector form · Technology standard · Cable / adapter reference

Related reading 5 references

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Reference question

What should I check on a long active USB-C cable?

Short answer Check the exact cable model: data speed, display support and charging are listed separately, and “active” or “Thunderbolt compatible” does not guarantee all three.

Keep exact length, retimer construction, USB modes, display conditions and power separate.

Related record types: Connector form · Cable / adapter reference

Related reading 8 references

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Named-device question

Which Nikon Z 8 USB-C socket is for data, and which is for power?

Short answer Use the USB data connector for transfers and the separate USB Power Delivery connector for power.

The two USB-C sockets have different documented jobs; computer detection and camera power are not interchangeable.

Exact model: Nikon Z 8Do not transfer these requirements to another model or revision.

Related record types: Connector form

Related reading 2 references

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Named-device question

Which CalDigit TS4 USB-C ports are for data, power or a display?

Short answer The ordinary USB-C ports carry data and have their own power ratings, while the Thunderbolt ports have different roles. Check CalDigit’s port table for display output.

Keep the ordinary USB-C data group separate from the host and downstream Thunderbolt connections.

Exact model: CalDigit TS4Do not transfer these requirements to another model or revision.

Related record types: Connector form

Related reading 3 references

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11 guides

Display connections

HDMI, DisplayPort and DVI questions, plus named capture-device paths.

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Jump to a question 11 in this subject

Reference question

Does the HDMI connector or cable shape tell me the HDMI version?

Short answer No. The shape tells you the HDMI connector type, not the HDMI version or what the cable or device can do.

Separate HDMI Type-A/Mini/Micro physical form from HDMI specification-version and exact cable/device capability.

Related record types: Connector form · Technology standard · Cable / adapter reference

Related reading 16 references

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Reference question

Why can a DisplayPort/HDMI adapter work only one direction?

Short answer Because the conversion inside works one way; use an adapter documented for your direction.

Treat source/sink direction and active/passive conversion as evidence questions rather than assuming a reversible physical path.

Related record types: Connector form · Cable / adapter reference

Related reading 11 references

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Reference question

How should I count DVI contacts: grid, blade or analog group?

Short answer Say which count you mean: the pin grid has 18 positions (single-link) or 24 (dual-link), separate from the flat blade and the analog contacts C1–C5.

Read DVI-D and DVI-I single-/dual-link counts without mixing a visible contact pattern with a numbered assignment table.

Related record types: Connector form

Related reading 7 references

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Reference question

DVI to VGA: when is a passive adapter not enough?

Short answer When the DVI port outputs only digital video. A passive adapter cannot create analog video; you need an active converter.

Separate access to a documented analog signal from conversion of a digital-only signal.

Related record types: Connector form

Related reading 7 references

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Reference question

Which DVI pinout view am I looking at?

Short answer Check whether the diagram shows the socket face or the plug face: they are mirror images.

Keep receptacle-front orientation, digital-only and integrated assignments, and device-specific labels separate.

Related record types: Connector form

Related reading 6 references

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Reference question

Can I reverse a DVI-to-VGA converter?

Short answer Usually not. A converter works in its documented direction (for example DVI in, VGA out) unless its documentation says otherwise.

Start with the documented source and display, then distinguish passive analog adaptation, active conversion and a bidirectional digital cable.

Related record types: Connector form · Cable / adapter reference

Related reading 14 references

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Reference question

Why does a DVI adapter have a USB lead?

Short answer It depends on the adapter: some use the USB lead for power, others to add audio. Check that exact product’s instructions.

A USB connection can have a different documented job on different adapters. Separate optional power from audio insertion.

Related record types: Connector form · Cable / adapter reference

Related reading 8 references

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Reference question

HDMI/DVI cable or USB-audio adapter: what changes?

Short answer A plain HDMI–DVI cable carries video but is not documented for audio; a USB-audio adapter such as DVI2HD adds stereo audio.

Do not promote bidirectionality, a full DVI grid or a published timing into unsupported audio and performance guarantees.

Related record types: Connector form · Cable / adapter reference

Related reading 10 references

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Named-device question

How do Elgato 4K X input, passthrough and USB capture differ?

Short answer HDMI In takes the source, HDMI Out passes it to your display and USB-C sends the captured video to your computer.

An image on the connected display does not prove that the same signal can be captured in the requested format.

Exact model: Elgato Game Capture 4K XDo not transfer these requirements to another model or revision.

Related record types: Connector form

Related reading 3 references

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Named-device question

How many HDMI outputs does ATEM Mini Pro ISO have, and what is USB-C for?

Short answer Four HDMI inputs and one HDMI program output. The USB-C port has several documented uses, which are not documented as all available at once.

One HDMI program output is not the same as the specification’s total-output count or the USB interface’s list of uses.

Exact model: Blackmagic ATEM Mini Pro ISODo not transfer these requirements to another model or revision.

Related record types: Connector form

Related reading 3 references

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2 guides

Ethernet & network cables

Connector names and cable-category wording.

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Reference question

Is RJ45 the connector or Ethernet?

Short answer RJ45 (properly 8P8C) names the plug shape. Ethernet is one of the things that can run through it.

Keep the familiar RJ45/8P8C modular form separate from Ethernet service, link rate, PoE and exact wiring/application.

Related record types: Connector form · Cable / adapter reference

Related reading 6 references

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Reference question

Can I tell Cat5e, Cat6 or Cat6A from the plug?

Short answer No. Read the printing on the cable jacket or the product documentation.

Use the modular ends only to identify the cable family; category, shielding, construction and installed-channel performance require markings or exact product/system evidence.

Related record types: Connector form · Cable / adapter reference

Related reading 4 references

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3 guides

Coax & RF

Connector families, impedance and product-specific performance evidence.

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Reference question

Are all BNC cables 75 ohms?

Short answer No. BNC parts exist in both 50-ohm and 75-ohm versions; check the rating of the exact cable or assembly.

Keep BNC connector appearance separate from exact cable impedance, cable type, SDI/RF use, loss and run-length capability.

Related record types: Connector form · Cable / adapter reference

Related reading 4 references

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Reference question

BNC, Mini-BNC and HD-BNC: are they the same connector?

Short answer No. BNC, Mini-BNC and HD-BNC are separate connector families; match exact parts or use a documented adapter between them.

A panel-density illustration is not a mating-interface drawing, and similar names do not identify the same counterpart.

Related record types: Connector form

Related reading 4 references

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Reference question

Does an HD-BNC connector guarantee 75 ohms or 12G-SDI?

Short answer No. HD-BNC comes in both 50-ohm and 75-ohm versions, and 12G products are a separate line.

Separate physical form, impedance, the named 12G subset and a complete path’s operating requirements.

Related record types: Connector form

Related reading 4 references

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7 guides

Fiber connections

Coupling, polish, patch-cable labels and polarity wording.

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Reference question

Can LC and SC fiber connect just because an adapter or jumper fits?

Short answer Only physically. Fiber type, polish, wavelength and transceivers must also match for a working link.

Separate connector-form mating from fiber type, polish, wavelength, transceiver and optical-budget requirements.

Related record types: Connector form · Cable / adapter reference

Related reading 5 references

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Reference question

FC vs ST: what should I check before connecting them?

Short answer FC and ST lock in different ways (ST uses a bayonet). An FC–ST adapter makes them fit, but fitting does not guarantee a working optical path.

Separate connector coupling, ferrule construction and hybrid adapters from polish and optical-path requirements.

Related record types: Connector form · Reference guide

Related reading 4 references

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Reference question

Can I connect UPC and APC fiber connectors together?

Short answer No. Mating UPC and APC directly performs poorly and can damage the endfaces; use a correctly specified hybrid cord.

Do not confuse a hybrid patch cord or a non-contact test port with direct mating of unlike polished endfaces.

Related record types: Reference guide · Connector form

Related reading 5 references

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Reference question

How do I read a fiber patch-cable label?

Short answer Read the connector on each end first, then polish, fiber type (such as OM4 or OS2), simplex or duplex, and polarity.

Separate connector ends, each end’s polish, fiber category, fiber count and path mapping before checking the equipment.

Related record types: Connector form · Reference guide · Cable / adapter reference

Related reading 10 references

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Reference question

Does a reversible LC uniboot prove the polarity of my link?

Short answer No. It shows the cable can be reversed, not how your whole link is wired right now.

Keep a named cable’s factory mapping, its change mechanism and the actual end-to-end duplex path separate.

Related record types: Connector form · Cable / adapter reference

Related reading 5 references

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Reference question

What does A–B mean on a one-fiber simplex cable listing?

Short answer Nothing definite: a one-fiber cable has no pair to map, so that listing wording stays unresolved.

Do not turn generic marketing wording into a documented two-fiber mapping.

Related record types: Connector form · Reference guide · Cable / adapter reference

Related reading 6 references

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Reference question

Is a hybrid fiber adapter the same as a hybrid patch cord?

Short answer No. A hybrid adapter joins two different connector types; a hybrid patch cord is a cable with a different connector on each end.

Separate a documented mechanical coupler from an assembled fiber cable and from an optical compatibility result.

Related record types: Connector form · Reference guide · Cable / adapter reference

Related reading 10 references

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6 guides

Audio connections

Analog and optical paths, cable roles and format distinctions.

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Reference question

Does an XLR cable automatically work with every microphone setup?

Short answer Not automatically. The plug fits, but wiring, signal type and phantom power still have to match your microphone and interface.

Keep the 3-pin XLR cable form separate from device-specific pin assignment, phantom-power behavior, signal role and exact equipment compatibility.

Related record types: Connector form · Cable / adapter reference

Related reading 4 references

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Reference question

What do RCA colors mean: audio, composite or component?

Short answer Colors are hints that overlap: red is right-channel audio and also a component-video color; yellow is composite video.

Read labels and signal roles before choosing a connection by color.

Related record types: Connector form

Related reading 3 references

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1 guide

Across connection types

Why a physical fit is not the whole connection.

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Reference question

Why can a cable or adapter fit but still not work?

Short answer Because fitting is only physical: direction, signal type, cable capability and power must also match.

Use physical fit as only the first layer; direction, protocol, conversion, cable capability, power, performance and exact-device evidence can still remain unresolved.

Related record types: Connector form · Cable / adapter reference

Related reading 10 references

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13 guides

Storage & memory cards

Card contacts, M.2, readers, host requirements and performance labels.

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Jump to a question 13 in this subject

Reference question

How many contacts do SD and microSD cards have?

Short answer Standard SD has 9 contacts and microSD has 8; UHS-II and SD Express cards add more.

Identify the conventional first row without assuming every SD generation has the same contact count.

Related record types: Connector form · Technology standard

Related reading 6 references

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Reference question

SDHC, SDXC, UHS-I, U3 and V30: which label answers which question?

Short answer SDHC and SDXC are capacity, UHS-I is the bus interface, and U3 and V30 are performance classes.

Separate card shape, capacity family, bus interface and recording class instead of comparing unlike labels.

Related record types: Connector form · Technology standard

Related reading 6 references

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Reference question

Do microSD Express and microSD UHS-II use the same extra contacts?

Short answer No. They add different second rows of contacts in different positions.

Two cards can share the microSD outline without sharing their second-row geometry or host interface.

Related record types: Connector form · Technology standard · Reference guide

Related reading 7 references

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Reference question

Does an M.2 key tell me SATA, PCIe or NVMe support?

Short answer No. The key shows physical fit only; check whether the slot supports SATA or PCIe/NVMe.

Keep the module format, key, wired interface, storage protocol and exact host requirements separate.

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Related reading 6 references

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Reference question

Does M.2 2242 or 2280 tell me whether a drive will fit?

Short answer Partly. The numbers give the size (22 × 42 mm or 22 × 80 mm); the slot must also match the key, mounting point and interface.

Decode nominal module sizes without turning a format code into a mating drawing or clearance guarantee.

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Related reading 2 references

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Reference question

Are Mini PCIe, mSATA and M.2 the same connector?

Short answer No. Mini PCIe and mSATA share a socket shape but differ in interface, and M.2 is a different connector.

Distinguish a shared socket outline from its electrical role, then separate both from M.2.

Related record types: Connector form · Reference guide

Related reading 6 references

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Reference question

Why can installing M.2 disable SATA ports or change PCIe lanes?

Short answer Motherboards share resources between slots. Your board’s manual lists which ports switch off when an M.2 slot is used.

Use one exact motherboard manual to separate connector shape from CPU wiring and shared resources.

Related record types: Connector form · Reference guide

Related reading 6 references

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Reference question

Will an M.2 adapter or USB enclosure work with my SSD?

Short answer Only if it supports your drive’s interface (SATA or NVMe), key and size.

Read the drive-facing and host-facing requirements separately, with two named products rather than a universal adapter rule.

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Related reading 5 references

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Reference question

Is CFexpress Type A or B the same as its generation?

Short answer No. Type A or B is the card’s physical form; a version such as 4.0 is its specification generation.

Separate the physical type, specification generation, protocol and exact equipment support.

Related record types: Connector form · Reference guide

Related reading 5 references

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Reference question

Does an XQD slot automatically support CFexpress Type B?

Short answer No. The shape matches, but support depends on the camera’s firmware; Nikon, for example, added it to the D850 by update.

Use an exact firmware example without extending it to every camera or reader.

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Related reading 5 references

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Reference question

What do UDMA, UHS and USB mean on a multi-card reader?

Short answer They label different parts: UDMA for CompactFlash, UHS-I for SD cards and USB for the link to the computer. None is a measured transfer speed.

Keep each card slot’s interface separate from the computer connection.

Related record types: Connector form · Reference guide

Related reading 8 references

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Reference question

Do two supported card families mean two usable slots?

Short answer Not necessarily. Sony’s MRW-G2, for example, has one shared slot for CFexpress Type A or SD, so only one card at a time.

Distinguish alternative cards, physical slots, insertion and simultaneous access.

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Related reading 3 references

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Reference question

Is VPG the same as a card’s read speed or USB speed?

Short answer No. VPG guarantees a minimum sustained write for video, not read speed or USB speed.

Check sustained-write profile requirements separately from offload claims.

Related record types: Connector form · Reference guide

Related reading 4 references

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5 guides

Analog video & conversion

VGA, RCA and the documented direction of conversion.

All subjects ↑

Reference question

Why do VGA pinout tables disagree?

Short answer Some pins (5, 9 and 11) are used differently by different devices, so check your device’s manual.

Compare named device manuals instead of combining their assignments into a universal HD15 wiring map.

Related record types: Connector form

Related reading 1 reference

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Reference question

Does VGA carry audio?

Short answer No. VGA carries video only; audio needs a separate cable.

Keep the conventional VGA video path separate from the audio path and any combined cable assembly.

Related record types: Connector form

Related reading 3 references

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Reference question

Will a VGA-to-RCA cable convert my video signal?

Short answer No. A plain cable does not convert ordinary VGA video for an RCA video input.

Separate a documented multi-mode port and breakout cable from actual signal conversion.

Related record types: Connector form

Related reading 2 references

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Reference question

HDMI to RCA or RCA to HDMI: which direction does the converter support?

Short answer Each converter works one way: HDMI-to-RCA for an HDMI source, RCA-to-HDMI for an RCA source.

Compare two named powered converters by input, output, separate audio and power—not by the connector pair alone.

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Related reading 6 references

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Reference question

Why can three RCA plugs mean component video or composite plus audio?

Short answer Three RCA plugs can be component video or composite video plus stereo audio; the count alone does not tell you which.

Keep three-channel video separate from one video signal plus two audio channels, using named cable-series and converter evidence.

Related record types: Connector form · Cable / adapter reference

Related reading 12 references

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