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A NIM (Network Interface Module), also known less frequently as an ITD (Integrated Tuner Demodulator), is a complete Frontend.

NIMs are meant to be drop in modules (hence the "M" in "NIM") for receivers of any kind of application (PC device, STB, or that built into a TV).

Typically, the module is comprised of a PCB (printed circuit board), on which resides the tuner and demodulator(s), as well as related electronic circuitry, and which is housed within a metal RF shield and heat sink, colloquially referred to as the tin can. If you have a PC card which features a NIM, upon inspection of the device, you will notice that the NIM is held in place on the card by metal wires that are soldered between the NIM's own PCB and connection points on the card's PCB.