At&t Bell Laboratories

Cecilia S Chen

Gilbert Mark Stewart

Barry L Posterick

Patrick K Brady

A test arrangement and method for use prior to the replacement of a first switching system serving a plurality of subscriber lines via a digital carrier facility and via a remote terminal, by a second switching system, where facility interface equipment of the second system is bridged directly onto the digital facility to allow monitoring of digital signatures transmitted from the remote terminal during the continued, uninterrupted operation of the first system. A pair gain test controller of the first system is advantageously used by the second system to control the generation of such digital signatures to verify the consistency of the translation databases of the two systems in associating directory numbers with subscriber lines.

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Naperville, IL, United States of America

Cecilia S Chen