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• 10:19, 7 March 2025 Sarah talk contribs created page Master Test Frame (Created page with "The '''Master Test Frame (MTF)''' is part of the maintenance center in a No. 5 Crossbar switch. It consists of bays of equipment that are used to test the various parts of its associated switching machine. Generally, there is one MTF per marker group, so in an office with several marker groups, there would be several MTFs. In a No. 5 central office, practically all the controls for maintenance equipment are concentrated in one maintenance center called the master test f...") Tag: Visual edit