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:
Dec. 23, 1986
Filed:
Apr. 13, 1984
Charles E Huffman, Plano, TX (US);
Paul E Pepmiller, Richardson, TX (US);
Rockwell International Corporation, El Segundo, CA (US);
Abstract
When a digital muldem employs protective switching, a requirement exists to perform revertive switching. The present disclosure illustrates a way to test the failed module after a switch to determine whether the module is actually failed or the decision to switch was based on momentary external conditions. The test is accomplished by looping back the 'failed' module, passing data from one of the operative channels through the 'failed' module and doing a bit by bit compare of input and output data for identity. If all of the muldems convert signals to a common frequency, only a single compare circuit need be used on a multiplexed basis.