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:
Oct. 07, 1997
Filed:
Dec. 12, 1995
Masaki Komatsu, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In an inter-PBX routing apparatus, calls from channels of different service categories to a destination are normally carried by a first route. A controller determines the available bandwidth remaining in the first route, classifies the channels as a first or a second category if they cannot or can tolerate delays when establishing an alternate route, respectively, or a third category if they do not require the second route when the first route is overflowed. A second route is established on a pre-assigned basis when the bandwidth of at least one idle channel of the first category is greater than the available bandwidth and on a demand-assigned basis in response to a request from a channel of the second category having a bandwidth greater than the available bandwidth. When the second route is established, the controller controls a switch to establish a path between a requesting channel and the first route if the requested bandwidth is equal to or smaller than the available bandwidth or a path between it and the second route if the requesting channel is classified as the first or second category and the request bandwidth is greater than the available bandwidth. The controller returns a busy tone to the requesting channel if the requested bandwidth is greater than the available bandwidth.