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:
Jan. 24, 1989
Filed:
Apr. 27, 1987
Gregory F Hicks, Nepean, CA;
Northern Telecom Limited, Montreal, Quebec, CA;
Abstract
The invention provides a circuit for monitoring predetermined performance criteria of a transmission link by measuring a predetermined ratio of events in a data stream. A first counter having a predetermined maximum count is responsive to each of periodic predetermined occurrences in the data stream and a clock pulse for also increasing its count by one. A second counter having a predetermined maximum count is responsive to each error of predetermined type in the data stream and a clock pulse for increasing its count by one. The overflow output of the first counter is connected to the clear input of the second counter and the overflow output of the second counter is connected to the clear input of the first counter. A signal appearing at the overflow output of the second counter indicates that the predetermined ratio of events in the data stream has not been met. The circuit also provides turn-on, turn-off hysteresis.