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quad - A group of four wires composed of two pairs twisted together.

quality assurance - All actions taken to ensure that standards and procedures are adhered to and that delivered products or services meet performance requirements. The planned systematic activities necessary to ensure that a component, module, or system conforms to established technical requirements. The policy, procedures, and systematic actions established in an enterprise for the purpose of providing and maintaining a specified degree of confidence in data integrity and accuracy throughout the lifecycle of the data, which includes input, update, manipulation, and output.

quality control - A management function whereby control of the quality of raw materials, assemblies, produced materiel, and components, services related to production, and management, production, and inspection processes is exercised for the purpose of preventing undetected production of defective materiel or the rendering of faulty services.

quartz clock - A clock containing a quartz oscillator that determines the accuracy and precision of the clock.