什麼是usb upstream port - wangchangruei - 博客园
Startech 4 Port USB 2.0 Hub - 4 x 4-pin Type A Female USB 2.0 - USB Downstream 1 x 4-pin Type B Female USB 2.0 - USB Upstream - External - Walmart.com
Overview Features Description
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Tripp Lite 7-Port USB 2.0 Hi-Speed Hub Compact Desktop Mobile Tower - 7 x 4-pin Type A Female USB 2.0 USB Downstream, 1 x 4-pin Type B Female USB 2.0 USB Upstream - External" - R&A Office Supplies
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