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. 14, 2006
Filed:
Oct. 05, 2001
Hirotsugu Kawada, Sakai, JP;
Yuji Mizuguchi, Hirakata, JP;
Takahisa Sakai, Amagasaki, JP;
Noboru Katta, Itami, JP;
Toshihiko Kurosaki, Kobe, JP;
Nobuhiko Yasui, Moriguchi, JP;
Yutaka Takahira, Neyagawa, JP;
Hirotsugu Kawada, Sakai, JP;
Yuji Mizuguchi, Hirakata, JP;
Takahisa Sakai, Amagasaki, JP;
Noboru Katta, Itami, JP;
Toshihiko Kurosaki, Kobe, JP;
Nobuhiko Yasui, Moriguchi, JP;
Yutaka Takahira, Neyagawa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A first initialization pattern signal is a signal in which a maximum signal level and a minimum signal level appear alternately, and a second initialization pattern signal is a signal in which all signal levels appear in a predetermined arrangement. In a ring-shaped network including plural stages of data transmission apparatuses (), a transmission unit () of each data transmission apparatus outputs the first initialization pattern signal successively to a next-stage data transmission apparatus at turn-on of power or immediately after reset, and a reception unit () establishes clock synchronization on the basis of the first initialization pattern signal received. When synchronization is established in all of the data transmission apparatuses, the transmission unit () outputs the second initialization pattern signal successively to the next-stage data transmission apparatus, and the reception unit () sets evaluation levels for the respective signal levels on the basis of the received second initialization pattern signal, and transmission/reception of data is started when evaluation levels are set in all of the data transmission apparatuses.