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. 30, 1995
Filed:
Nov. 17, 1993
Masashi Hiraiwa, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Sub-rate calls of 8.sup.k .times.n bps (where n=1, 2, . . . ) are multiplexed in any combination on a digital transmission path having a basic (unit) bit-rate (64 kbps) as a unit. In order to set a sub-rate call of 8.sup.k .times.n bps in response to a call setting request from a low-speed data terminal, if a circuit switching call of 64 kbps is already set between the switching offices and the multiplex communication can be made at a rate required by the sub-rate call, the multiplex operation is made on 64 kbps circuit switching call to set the sub-rate call between terminals. On the other hand, if the sub-rate call can not be set, a circuit switching call having a new basic bit rate (64 kbps) is set between the switching offices at a time of occurrence of the sub-rate call if necessary to set the sub-rate call between the terminals.