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As digital transmission expands within telecommunication networks, maintenance tools for those networks evolve as well. For testing digitized services (including voice, voiceband data, and digital data-like services), digital test equipment most efficiently analyzes circuit failures. One such device, the AT&T Remote Measurement System-Digital (RMS-D), utilizes digital access and measurement techniques to test both switched and nonswitched services. The capabilities of the RMS-D, and the testing needs of the special services digital network it fulfills, are described here. Examples of how the RMS-D effectively utilizes the digital transmission network for access are discussed for different circuit densities.