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. 02, 1996
Filed:
Feb. 24, 1995
Masashi Hiraiwa, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A switching system between two offices connected by plural digital lines and an outband channel. Each digital line has plural channels, and each channel has a corresponding basic bit rate and is able to multiplex plural sub-rate channels so as to accommodate sub-rate calls. When one of the offices requests the setting of a sub-rate call, a digital interface system designates to the other office, through the outband channel, a sub-rate channel to be used and attribute information concerning the sub-rate channel. If the designated sub-rate channel is not usable by the receiving office, a control unit at the receiving office selects a usable sub-rate channel and informs the originating office that the sub-rate channel is changed to the usable sub-rate channel.