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USB to Serial Adapter USB-A/DB9-M
By Tripp Lite

Tripp Lite's USB to serial adapter enables a serial device to be connected to a computer through the USB port. Perfect for a PDA, digital camera, modem or ISDN terminal with a serial port. The adapter upgrades a traditional RS-232 serial port (DB9 male) to USB (a male). The unit features a portable design that does not require external power or complicated set-up procedures. ... 

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DUB-H4 High-Speed USB 2.0 4-Port Hub
By D-Link Systems

The D-Link DUB-H4 2.0 is a Hi-Speed Universal Serial Bus 2.0 4-port hub with backward compatibility to USB 1.0 and 1.1. It provides an out of the box industry standard that allows connection of up to four USB peripherals or devices to your USB ready PC or Mac. The D-Link DUB-H4 is targeted at PC and Mac users that are expanding the number of USB ports on their system. ... 

DUB-H7 QuickMedia High-Speed USB 2.0 7-Port Hub
By D-Link Systems

The D-Link QuickMedia DUB-H7 2.0 is a Hi-Speed USB 2.0 7-port hub that is backward compatible with USB 1.0 and 1.1. The DUB-H7 allows connection of up to seven additional USB peripherals or devices to your USB ready PC or Mac. - Designed to provide quick and easy access, the D-Link DUB-H7 provides seven type A USB downstream ports for connecting USB peripherals, devices, or other USB hubs. ...