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Q band - The band of frequencies between 36 and 46 gigahertz.

QoS - Quality of service.

QPL - A Qualified Products List issued by the U.S. government.

QPSK (quadrature phase shift keying) - It is a digital frequency modulation technique used for sending data over coaxial cable networks.

Quad - A series of four separately insulated conductors, generally twisted together in pairs.