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:
May. 27, 1986
Filed:
May. 22, 1984
Applicant:
Inventor:
James J Ferenc, Boulder, CO (US);
Assignee:
AT&T Information Systems Inc., Middletown, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04J / ; H04J / ; H04B / ; G06F / ;
U.S. Cl.
CPC ...
370 13 ; 375 10 ; 371 68 ;
Abstract
Apparatus and method are disclosed for checking the time slot data word integrity of data communications in a time multiplexed communication system. A predetermined control bit of each data word of a data frame is alternately switched from its normal control bit function to a bit of a pseudo random sequence (PRS) for time slot data word integrity checking. During alternate data frames a checking circuit compares the predetermined bit of received consecutive data words against consecutive bits of a reference PRS and outputs a time slot cross connect error signal when a difference occurs.