Multiplex communications – Fault recovery – Bypass an inoperative switch or inoperative element of a...
Patent
1995-11-30
1998-12-01
Olms, Douglas W.
Multiplex communications
Fault recovery
Bypass an inoperative switch or inoperative element of a...
370395, H04L 1256, H04Q 1104
Patent
active
058448870
ABSTRACT:
A distributed, scalable and modular asynchronous transfer mode (ATM) switching fabric is disclosed. The switching fabric includes port interface modules for connecting physical devices to the switch fabric. The switch fabric is arranged as rows of input buses running horizontally and columns of output buses running vertically. A junction module is located at each intersection of input and output buses. A switch can be constructed having any integer number M input and output buses, each input and output bus having an associated port interface module. The switching fabric for the specific case of M=2 is presented. Junction modules buffer and store cells received from the input buses and subsequently output cells onto the output buses. A junction module only accepts cells destined for one of the two output buses connected to itself. One output module is connected to each junction module situated with the same fabric column. Output modules instruct the junction modules when to store and output a cell. They also determine the order upon which cells are output onto the output buses. Communication protocols between output modules and junction modules and between output modules and port interface modules are disclosed. A method of providing N+1 redundancy within the switch fabric is also disclosed. The addition of one spare fabric card provides the means to provide redundancy in the event one of the regularly operating fabric cards fails.
REFERENCES:
patent: 5436886 (1995-07-01), McGill
patent: 5509008 (1996-04-01), Genda
Anthony Alles, "ATM Interworking", May 1995, Cisco Systems, Inc. publication pp. 1-58.
Uyless Black, ATM: Foundation for Broadband Networks, Prentice Hall, pp. 193-195, 1995.
David E. McDysan et al., ATM: Theory and Application, McGraw-Hill, p. 299, 1995.
Doron Eitan
Olier Albert
Oren Yair
Shussman Yossi
Toy Benny Siman
Olms Douglas W.
Phillips Matthew C.
Scorpio Communications Ltd.
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