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Originally Posted by gfunkdave
(Post 29424903)
In fact, I think A-A USB cables are prohibited by the USB people.
Part of the problem with an A-A type connector is that USB is a serial connection - there are 2 power wires (5v+, 5v-) and 2 communication wires (TX, RX). A device using an A-A connector would either need to have the TX and RX reversed onboard (in the hardware), or would need the cable to be non-standard by connecting TX to RX and vice versa - much like a null modem cable in the days of old. I know that the wires are actually Vcc/Gnd/D+/D-, but it doesn't really affect the understanding of the issue, so I simplified) |
Originally Posted by Qwkynuf
(Post 29425292)
Possibly, but I have a small handful of USB Portable hard drives which use A-A cables. They seem to be sturdier than the "micro-B 10 pin" connectors on my others.
Part of the problem with an A-A type connector is that USB is a serial connection - there are 2 power wires (5v+, 5v-) and 2 communication wires (TX, RX). A device using an A-A connector would either need to have the TX and RX reversed onboard (in the hardware), or would need the cable to be non-standard by connecting TX to RX and vice versa - much like a null modem cable in the days of old. I know that the wires are actually Vcc/Gnd/D+/D-, but it doesn't really affect the understanding of the issue, so I simplified) |
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