Non-blocking broadcast network

Details Non-blocking broadcast network Non-blocking broadcast network

1993-10-19

1995-09-19

Swarthout, Brent

Communications: electrical

Continuously variable indicating

With meter reading

34082503, 379220, 379271, 370 161, H04Q 900

Patent

active

054519365

ABSTRACT:
The present invention pertains to a nonblocking broadcast switching network. The network comprises an input stage. The input stage has N.sub.1 or n.sub.1 r.sub.1 input ports and r.sub.1 switches, where n.sub.1 .gtoreq.2 and r.sub.1 .gtoreq.1 and are integers. The network is also comprised of an output stage. The output stage has N.sub.2 or n.sub.2 r.sub.2 output ports and r.sub.2 switches, where n.sub.2 .gtoreq.2 and r.sub.1 .gtoreq.1 and are integers. There is also a middle stage. The middle stage has m switches where m is an integer and, where ##EQU1## The m switches are in communication with the r.sub.1 switches and r.sub.2 switches. The middle stage of m switches has L inputs, where L.gtoreq.r.sub.1 and is an integer, and J outputs, where J.gtoreq.r.sub.2 and is an integer, x or fewer of the m switches, where 1.gtoreq.x.gtoreq.min{n.sub.2 -1, r.sub.2 } and is an integer, always available to form a connection between an idle input port and a plurality of idle output ports, but no output port is connected to more than 1 input port. In a preferred embodiment, the controller is comprised of means for determining which middle stage switches are idle at a given time in the network. The controller is also comprised of means for choosing middle stage switches from only the idle middle stage switches to form a desired broadcast connection between an idle input port and a plurality of idle output ports. Preferably, the choosing means chooses the minimum number of idle middle stage switches to form the desired broadcast connection.

REFERENCES:
patent: 3582560 (1971-06-01), Banks
patent: 4394541 (1983-07-01), Seiden
patent: 4400627 (1983-08-01), Zola
patent: 4417245 (1983-11-01), Melas et al.
patent: 4696000 (1987-09-01), Payne, III
patent: 4845736 (1989-07-01), Posner et al.
patent: 4907253 (1990-03-01), Watrous
patent: 4975909 (1990-12-01), Masson et al.

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