Switching network and switching-network module for an ATM system

Details Switching network and switching-network module for an ATM system Switching network and switching-network module for an ATM system

1990-08-09

1992-02-25

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3408258, H04Q 1104

Patent

active

050919032

ABSTRACT:
The disclosed asynchronous transfer mode (ATM) switching network evenly scatters individual cells of an ATM data stream in the first half of the network and routes them to their intended destination in the second half of the network. The network is constructed from interchangeable switching modules each preferably containing only two stages of switching elements, with each switching element having a common memory, thus reducing the component count by one third compared to Clos' 3-stage non-blocking modules. Each individual module provides a switched path from any selected one of its module inputs to any selected one of its module outputs, with the common memory acting as a buffer until a path becomes available to the desired module output. Since the additional stages between the module's input stage and the module's output stage typically used to provide a non-blocking module are dispensed with, not only the component count, but also the transmission delay through the switching network may be reduced.

REFERENCES:
patent: 4382294 (1983-05-01), Buescher et al.
patent: 4473900 (1984-09-01), Belforte et al.
patent: 4654842 (1987-03-01), Coraluppi et al.
patent: 4718058 (1988-01-01), van Vugt
patent: 4811333 (1989-03-01), Rees
J. S. Turner, "Design of a Broadcast Packet Network", Proceedings of INFOCOM 86, Apr. 1986, pp. 667-675.
J. M. Cotton et al, "ITT 1240 Digital Exchange Digital Switching Network", Electrical Communication, vol. 56, No. 2/3, 1981, pp. 148-160.

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