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. 01, 2008
Filed:
Feb. 25, 2002
Masaki Hirota, Kawasaki, JP;
Haruo Yamashita, Kawasaki, JP;
Tomohiro Shinomiya, Kawasaki, JP;
Nagao Shimada, Kawasaki, JP;
Masaki Hirota, Kawasaki, JP;
Haruo Yamashita, Kawasaki, JP;
Tomohiro Shinomiya, Kawasaki, JP;
Nagao Shimada, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A method for time-division multiplexing including steps of generating a plurality of first signals and a plurality of second signals to which specific pulse trains for frame synchronization are allocated respectively; generating low speed signals of plural channels including the first and second signals and transmission signals; a conversion step; and time-division multiplexing the low speed signals after the conversion step, thereby obtaining high speed signals. When applied to SDH, for example, the first and second signals may be A1 bytes and A2 bytes respectively, and the transmission signals may ho payload signals. According to one aspect of the invention, at the conversion step, the first and second signals in each channel are panty convened into either of '1/0' alternating signals and '0/1' alternating signals. Consequently, it becomes possible to reduce the number of successive same code and to diminish the deviation of the mark rate.