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:
Jul. 27, 1999
Filed:
Apr. 14, 1997
Toshiaki Mukojima, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
Transmission error correction is performed by generating an extremely small number of error correction code bits even when the value of N in STM-N (Synchronous Transport Module Level N) becomes large. The sending signal input terminal receives four AU-4 signals, and the serial/parallel conversion circuit converts the signals to eight parallel signals. The number of check bits required for encoding eight parallel bits is 14. The error correction encoder provided for the first bit divides a received data stream by a polynomial and sends the resulting remainder to the check bit output terminal 1 as the check bit. Each of the error correction encoders calculates the check bits of data streams using the polynomial and sends the results to check bit output terminals 2-8. The {n, k} shortened Hamming code is executed for each bit by inserting these check bits into undefined bytes in the multiplex-section overhead (MSOH).