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.