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:
Jun. 23, 2009
Filed:
Aug. 17, 2005
Yoshio Ito, Tokyo, JP;
Seiji Fukuda, Tokyo, JP;
Yoshio Ito, Tokyo, JP;
Seiji Fukuda, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A digital modulating and demodulating device is compatible with both PDH and SDH signals by dividing and combining input signals in many directions with a matrix switching unit. The digital modulating and demodulating device is provided as a combination of two conventional PDH device with an SDH mapping circuit, an SDH demapping circuit, and an SDH interface for allowing SDH signals to be input to and output from the digital modulating and demodulating device. Since the matrix switching unit is capable of dividing and combining input signals in many directions, the digital modulating and demodulating device simultaneously provides interfaces for inputting and outputting a PDH baseband signal and an SDH signal, and makes it possible to combine conventional separate device for PDH and SDH signals with each other.