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<blockquote data-quote="Vipersan" data-source="post: 983755" data-attributes="member: 325666"><p>Spent all last night trying to get to the bottom of what might lie at the bottom of all my issues ..</p><p>I suspect there might be some problem usb sockets on the Optiplex 990.</p><p>I built a clean OS specifically to test them ..on a new drive so as not to destroy what I have already.</p><p>Then went to Dell ..and ran their online PC doctor tests ...specifically USB tests ..</p><p>There are 6 ports to the rear and 4 at the front ..</p><p>Supposedly all USB2</p><p>Running the interactive tests ..plugging in usb pens ..</p><p>All ports passed ..</p><p>So ran it again ...plugging in compound bulk in interface devices ..</p><p>ie ...dongles ..</p><p>3 of the rear ports failed</p><p>2 of the front ports also failed ..</p><p>The rest passed ..</p><p>So my conclusion is that although these ports sort of work ...it may be some are only partially functional/compliant ...and may well be the reason I'm having so much trouble.</p><p>If it is hardware failure I see no way round other than ..the inclusion of a low profile 4 port pcie card..</p><p>I only need 4 fully working ports at the rear ..</p><p>Now ...I cannot get a USB 2 version ..but there are USB3 low profile 4 external port cards available ...and are relatively cheap..</p><p>This would solve my problem ..</p><p>a) If the Optiplex 990 can accept it</p><p>b) If USB2 bulk interface devices are compatible with usb3</p><p>I assume the usb3 standard accomodates and is ok with older usb2 legacy devices ?</p><p></p><p>Well I ordered one just to see ....</p><p>Its a gamble but a relatively inexpensive one.</p><p>Price wise there is little difference between the card and an external USB hub ...which might well require external 5v power ....whereas the pcie card would not.</p><p></p><p>It could well be that running 4 SDR dongles 24/7 demanded too much current ..and is responsible for port failure ..</p><p>If the pcie card solution _does_ work ...</p><p>I feel this may be the way to go ...as they are easily replaced if they fail in the future.</p><p>Whereas ports on a motherboard are not.</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 983755, member: 325666"] Spent all last night trying to get to the bottom of what might lie at the bottom of all my issues .. I suspect there might be some problem usb sockets on the Optiplex 990. I built a clean OS specifically to test them ..on a new drive so as not to destroy what I have already. Then went to Dell ..and ran their online PC doctor tests ...specifically USB tests .. There are 6 ports to the rear and 4 at the front .. Supposedly all USB2 Running the interactive tests ..plugging in usb pens .. All ports passed .. So ran it again ...plugging in compound bulk in interface devices .. ie ...dongles .. 3 of the rear ports failed 2 of the front ports also failed .. The rest passed .. So my conclusion is that although these ports sort of work ...it may be some are only partially functional/compliant ...and may well be the reason I'm having so much trouble. If it is hardware failure I see no way round other than ..the inclusion of a low profile 4 port pcie card.. I only need 4 fully working ports at the rear .. Now ...I cannot get a USB 2 version ..but there are USB3 low profile 4 external port cards available ...and are relatively cheap.. This would solve my problem .. a) If the Optiplex 990 can accept it b) If USB2 bulk interface devices are compatible with usb3 I assume the usb3 standard accomodates and is ok with older usb2 legacy devices ? Well I ordered one just to see .... Its a gamble but a relatively inexpensive one. Price wise there is little difference between the card and an external USB hub ...which might well require external 5v power ....whereas the pcie card would not. It could well be that running 4 SDR dongles 24/7 demanded too much current ..and is responsible for port failure .. If the pcie card solution _does_ work ... I feel this may be the way to go ...as they are easily replaced if they fail in the future. Whereas ports on a motherboard are not. rgds VS [/QUOTE]
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