Internetwork routing using different service categories for esta

Details Internetwork routing using different service categories for esta Internetwork routing using different service categories for esta

1995-12-12

1997-10-07

Olms, Douglas W.

Multiplex communications

Data flow congestion prevention or control

Flow control of data transmission through a network

379221, H04L 1226

Patent

active

056755775

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.

REFERENCES:
patent: 4119815 (1978-10-01), Frankfort et al.
patent: 5042032 (1991-08-01), Dighe et al.
patent: 5210740 (1993-05-01), Anzai et al.
patent: 5212691 (1993-05-01), Hokari
patent: 5253288 (1993-10-01), Frey et al.
patent: 5442622 (1995-08-01), Hokari
patent: 5515418 (1996-05-01), Yamaguchi et al.

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