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. 09, 2004
Filed:
Mar. 27, 2000
Applicant:
Inventor:
Mizuyuki Ushirozawa, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 1/308 ;
U.S. Cl.
CPC ...
G01R 1/308 ;
Abstract
A transmission device includes a change-point counter counting, for a predetermined time interval, a number af change points in code included in an input digital signal for outputting a count result. A transmission rate identification circuit determines a transmission rate of the input digital signal based on the count result. The input digital signal includes an STM-N (Synchronous Transfer Mode: N is a positive integer) signal. The time interval is a value in a range from a time equivalent to three bytes of STM-4 to a time equivalent to N×10 bytes.