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. 19, 2002
Filed:
Aug. 19, 1998
Masaaki Soda, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A frame synchronous circuit enables a frame synchronization in relation to high speed SDH (Synchronous Digital Hierarchy) signal to be realized with simple constitution. A shift register which performs serial-parallel conversion of an STM-N (Synchronous Transport Module-N (=1, 2, 3, . . . )) signal by 1-byte unit, is in use by way of shift registers , and with parallel configuration inputting data alternately in every 1-bit, thus enabling sufficient time for processing operation of the data to be secured. Appearance of A -byte on two shift registers can be generated by way of two kinds of patterns of output positions which are shifted by one bit with each other caused by input order toward the shift register. Thereby, when the A -byte detecting circuit detects the A -byte at an inappropriate output position, slowing the STM-N signal by 1 bit at the 1-bit delay circuit in order to reverse the input order such that the A -byte is detected at the normal output position. Subsequently, the counter with 1-byte cycle which causes the latched-circuits , and to operate is reset so as to output parallel data with 1-byte unit by adjusting to the detecting timing (phase).