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| USB using nonstandard connectors |
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| Monkeh:
--- Quote from: Buriedcode on November 12, 2018, 01:46:30 am --- --- Quote from: Monkeh on November 12, 2018, 01:42:11 am --- --- Quote from: Buriedcode on November 11, 2018, 08:42:38 pm --- --- Quote from: ConKbot on November 09, 2018, 02:34:52 pm ---Depends on the application. Inside a PC, front panel USB2.0 is connected to a motherboard with 0.1" pitch pin headers (separate pin for grounds and shield) 10-20mm of wire that's not impedance controlled as it makes its way from the cabled bundle to the pin header. Not a high-end or really impedance matched connector in the least. --- End quote --- And those rarely run at high speed, not without errors. It doesn't matter how expensive the case is, front panel connectors and the cabling will be the cheapest you can get. The exception is with USB 3.0 which actually uses a USB 3.0 cable to connect to the motherboard. But I have yest to find a PC where the front panel USB 2.0 connectors allow for high speed. --- End quote --- I.. have yet to encounter a reasonable one which doesn't. I've put many terabytes through front panel USB ports on my own machines. --- End quote --- Then I'd like to know which case manufacturer you use. I don't really need >35MB/sec, I can just use the rear ports if I need ~50MB/sec, but I have never been able to use phones MPT reliably using front panel ports. --- End quote --- Antec, Silverstone, Coolermaster, Corsair, Fractal, NZXT, prebuilts from Dell, HP, Lenovo, 3.5" modules from various brands including cheapo card readers, Silverstone is the only one I remember.. |
| NiHaoMike:
--- Quote from: Richard_L on November 11, 2018, 11:42:05 pm ---The USB to RJ45 cable that APC insist on using for communication with many of their UPSs is in widespread use for reasons I don't understand (and the use of RJ45 surely fails to satisfy the V and GND first rule). (Try not to look at the price, btw) --- End quote --- The price is the reason why - they want to sell the overpriced cables! They also use a modified RJ45 to prevent crimping your own. |
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