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:
Feb. 16, 1993
Filed:
Dec. 20, 1991
Robert R Beffel, Naperville, IL (US);
Ellen R Blood, Naperville, IL (US);
Paul R Bufkin, Wheaton, IL (US);
Bernard M Dennison, Randolph, IL (US);
Jerry G Miller, Wheaton, IL (US);
James L Turner, Lemont, IL (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
The present invention addresses an improved solution to the problem of cutover verification testing where a new digital switching system is to replace an existing switching system that serves at least a group of subscribers via continuous wire lines. It permits a plurality of existing wire lines to be concurrently connected to channel units associated with the new switching system without adversely impacting the existing service and automatic testing under the control of the new system.