The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 1987
Filed:
Jul. 01, 1985
Patrick K Brady, Wheaton, IL (US);
Cecilia S Chen, Naperville, IL (US);
Barry L Posterick, Batavia, IL (US);
Gilbert M Stewart, Bolingbrook, IL (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
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.