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USB using nonstandard connectors
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Twoflower:

--- Quote from: T3sl4co1l on November 11, 2018, 08:34:54 pm ---FYI, I suspect 001 is trolling...

Tim

--- End quote ---
In retro perspective: You're probably right. And I fell for it... |O
Buriedcode:

--- 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.
Richard_L:

--- Quote from: Gyro on November 09, 2018, 01:26:07 pm ---If you look closely at a standard USB connector you will see that the VBUS and GND contacts are longer - they are designed to make contact before the D+ and D-. This is for ESD and proper signalling purposes. Whatever connector you use would have to mimic this action.

Normally you would want a pretty good reason for deviating from standard USB connectors.

--- End quote ---

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)

[/url]https://www.apc.com/shop/uk/en/products/UPS-Communications-Cable-Simple-Signalling-USB-to-RJ45/P-AP9827?isCurrentSite=true[url]
Monkeh:

--- 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.
Buriedcode:

--- 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.
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