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March 31, 2015. 1  An IRQ (Interrupt Request) number is assigned to all the hardware devices installed in a computer that are used to input information, for example the mouse or the keyboard. On a PC, some IRQs are predefined, so the Keyboard controller is always given an IRQ of 1, for example.
The IR Extender offers a solution if you would like to hide your digital cable box in a cabinet, entertainment center or other area where the cable box is out of sight. This small device connects to the USB port of the following Scientific Atlanta digital cable boxes: 4200, 4200HD, 4250, 4250HD, 8300, 8300HD and Samsung HD.