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:
May. 17, 2016
Filed:
Feb. 04, 2015
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Ryuji Kayama, Chikusei, JP;
Hiroyuki Suzuki, Utsunomiya, JP;
Takashi Nakano, Oyama, JP;
Nobuyuki Kobayashi, Kiryu, JP;
Akira Nozawa, Oyama, JP;
Koji Suda, Tochigi, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A transmission system includes: a first transmission apparatus to distribute a synchronization clock; and one or more second transmission apparatuses each to connect to the first transmission apparatus so as to synchronize with the synchronization clock from the first transmission apparatus, the second transmission apparatus including: a selection portion to select the first or second transmission apparatus of a connection destination so as to switch the synchronization clock; an output portion to generate an inquiry signal addressed to the first transmission apparatus via the second transmission apparatus of the connection destination selected; a determination portion to determine whether or not the inquiry signal generated by the second transmission apparatus is received; and a second control portion to determine that there is a synchronization clock loop having a loop path through the second transmission apparatus of the connection destination when the determination portion receives the inquiry signal.