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Telecom Dictionary - Q

QPAM - see Quadrature Phase Amplitude Modulation.

QPSK - see Quadrature Phase Shift Keying.

Quad - A cable conductor that consists of a single plastic casing containing four insulated wires that aren't twisted together.

Quadrature Phase Amplitude Modulation (QPAM) - This technique is used by high-quality modems to transmit multiple data bits per baud by combining the signals of two amplitude modulators.

Quadrature Phase Shift Keying (QPSK) - This is a technique to compress data transmitted by modems and other networks.

Quantum - This is most simply, a small, discrete unit of energy.

Queue - A line of instructions waiting to be carried out, or a series of data packets or messages that are waiting to be delivered.

QWERTY - The name for the most common type of computer or typewriter keyboard, on which the top, left row of keys is QWERTY. Compare to the Dvorak keyboard.