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Article #21Re: Front Panel USB Headers - some devices dont work
From: Jim McCARDLE
Date: Sun, 15 Jun 2008 06:01
Date: Sun, 15 Jun 2008 06:01
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I think it may be that often the usb wires to the front panel are NOT twisted or proper USB cabling. I have seen many that are flat multi colored ribbon leads and I suspect they create a transmission line of sorts but the impedance etc will be wrong. Kind of like using some 50 ohm coax and then 75ohm coax (looks similar but in Vietnam Tee shirt language "Same Same But Different"). In the days of coax ethernet I saw this quite often where someone had tinkered with the network cabling. J McC jmccardl@bigpond.net.au ------------------------------------------------------------------------------------------------------- On Sat, 14 Jun 2008 22:20:40 -0700 (PDT), BigAl.NZ@gmail.com wrote: >Hi All, > >I have come across this once or twice and its never really bothered >me, but I am curious as to why: > >Occasionally I fond certain devices wont work on front panel usb >headers, yet when plugged into the rear USB connectors that are "hard >wired" to the motherboard, they are fine. > >At the moment, I have two external HDDs (with there own power supply) >that wont work on the front but do work on the rear, however various >other devices such as mouse and USB thumb drives do work on the front. > >Why???? > >Cheers > >-Al >PS: seen it on both XP and Vista.
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