USB Power Delivery 240W: what Revision 3.1 changed
A technical reference on when 240W arrived, the added voltage levels, cable context, and the currently published PD specification.
Primary-source backed
Evidence-first knowledge & utilities
Knowledge built for questions, not chronology
Heliacal Dawn is not a reverse-chronological blog. We start with real questions and decision problems, then publish the representation that best fits the job: technical references, comparisons, utilities, data, or other evidence-backed forms. The substantive catalog is English-first, with a small Japanese-original set retained for publication lineage and direct reading.
Verified public assets: 40Primary-source backed: 40/40Original-language mix: 36 EN / 4 JA
Published now
Available knowledge
Most substantive assets are published as English originals, while a small Japanese-original set is retained. Each item keeps one durable canonical URL and discovery pages state the original language explicitly.
USB & Power
USB Power Delivery, USB-C cable capability, data performance, and compatibility decisions.
Display LinksHDMI, DisplayPort, USB-C video paths, cable classes, and bandwidth decisions.
Wi-Fi & NetworkingWi-Fi generation differences, 6 GHz, MLO, channel width, and security decisions.
Wireless PowerQi2, Qi2 25W, magnetic alignment, certification, and wireless charging compatibility.
USB PD SPR vs EPR: understanding 100W through 240W
A concept guide separating standard and extended power ranges and the voltage levels behind 100W, 140W, 180W, and 240W.
Primary-source backed
How to verify a 240W USB-C cable: separate EPR, 5A, E-Marker, and certification
A 240W USB-C cable decision guide that separates EPR power capability, 5A operation, electronic cable identification, USB-IF certification, and data-rate requirements.
Primary-source backed
USB-C data speed and power are separate: 80Gbps does not imply 240W
USB-IF expresses data performance as 5/10/20/40/80Gbps and USB-C cable power capability as 60W/240W. One number cannot be used to infer the other.
Primary-source backed
HDMI 2.2 96Gbps vs the 48Gbps HDMI 2.1 era: bandwidth is not the whole decision
HDMI 2.2 expands the link to as much as 96Gbps with next-generation FRL, but real display modes still depend on the source, display, and cable implementing compatible capabilities.
Primary-source backed
DisplayPort DP54 vs DP80: choose by UHBR13.5 or UHBR20 bandwidth needs
VESA DP54 certification covers four-lane UHBR13.5 operation up to 54Gbps, while DP80 covers four-lane UHBR20 operation up to 80Gbps.
Primary-source backed
Wi-Fi 6E vs Wi-Fi 7: 6 GHz support is not the whole generation difference
Wi-Fi 6E extends Wi-Fi 6 operation into 6 GHz, while Wi-Fi 7 adds capabilities such as Multi-Link Operation, 320 MHz channels, and 4K QAM.
Primary-source backed
Qi2 vs Qi2 25W: what changed from the 15W generation to 25W
The original Qi2 generation introduced magnetic alignment with up to 15W charging, while Qi v2.2.1 is branded Qi2 25W and extends the certified power class to 25W.
Primary-source backed
Not a blog taxonomy
One durable asset, only the representations that earn their place.
A single intellectual asset may later support a web page, utility, dataset, feed, or platform-native representation. We do not publish empty shells for formats or channels that do not yet exist.
Evidence first
Prefer primary and official sources, and keep observation separate from inference.
Stable identity
Distribution, experiments, and presentation can change without redefining the asset's durable identity.
Format follows the job
Choose the form that best solves the user's problem instead of optimizing for article count.
Trust surface
Content, method, and site operations remain independently inspectable.
Editorial methodology, privacy, terms, and contact policy remain independently inspectable. Operational and distribution choices do not decide whether a factual claim is true or whether an information asset should exist.
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