3 ms·
This keeps needing to be pointed out every thread this appears on. Plenty of cables have eMarkers that claim "40Gbps" or whatever speeds, or support 240W PD...b
by nerdsniper 2mo ago
This keeps needing to be pointed out every thread this appears on. Plenty of cables have eMarkers that claim "40Gbps" or whatever speeds, or support 240W PD...but absolutely cannot deliver either of those. And none of these consumer level testers can test either of those claims.
Resistance measurements can cursorily test claims of 240W but resistance changes with temperature which changes with current...so unless your tester puts 5 amps down the wire for 5 minutes and then tests resistance it's not a very good test.
- maya335 2mo agoYeah — "the eMarker said 40Gbps" is basically the same problem as trusting the print on the jacket. For home use I've ended up treating real capability as an empirical property of the specific cable+port+device combo: does this exact cable drive this monitor at the mode I want, under load, for an hour? If yes, it gets a colored heat-shrink band and never leaves that use case. Everything else is a phone/charge cable until proven otherwise.
- ChrisMarshallNY 2mo agoThat’s a very practical approach.
- consp 2mo agoI had a cheap no-name cable which claims 3.1 speeds (and thus needs a marker), though it lacks all differential pairs and borks every usb connection (after I cut it, it was obvious). No clue why it contains a marker chip but doesn't have any conductors. Likely for usb-pd but you do not want to put any power though it anyway as the conductors were cheap copper clad aluminium.