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:
Aug. 15, 1995
Filed:
Nov. 25, 1992
Noboru Ise, Kawasaki, JP;
Kenji Tsutsumi, Kawasaki, JP;
Ryoji Shimozono, Kawasaki, JP;
Aya Takagi, Kawasaki, JP;
Hiroyuki Kudoh, Fukuoka, JP;
Hiroshi Adachi, Fukuoka, JP;
Yoshihiro Shimizu, Fukuoka, JP;
Kunio Yamamoto, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
An ISDN switching system having facilities for testing an ISDN signal composed of B-channels and D-channels at least. The testing facilities can achieve a B-channel test and D-channel test selectively with simple construction by employing a converting unit in the system. The converting unit enables creation of a connection path between a test equipment and an object to be tested through an ISDN exchange and thus the ISDN signals for the test can be treated as usual ISDN signals. Thereby, the test equipment and the object can freely be connected to each other.