Rotating-access ATM-STM packet switch

Details Rotating-access ATM-STM packet switch Rotating-access ATM-STM packet switch

1991-04-11

1992-12-01

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 60, H04G 1104

Patent

active

051684926

ABSTRACT:
A new architecture of an ATM or ATM/STM switching node which is functionally equivalent to the classical buffer-space-buffer (BSB) architecture is disclosed. In the basic embodiment, it uses middle packet buffers with a rotator (commutator) at its input and output. It has two main advantages over the BSB architecture. First of all, in the ATM mode, the need for arbitration when more than one inlet competes for the same outlet during the same time slot is eliminated. Each packet knows when to proceed without being aware of the competing packets. This greatly simplifies the switching-control mechanism. Secondary, the switch hardware complexity is reduced through the use of clock-driven rather than state-controlled cross points. The cross-point ratio is 4/.sqroot.n, where n is the number of inlets (outlets).

REFERENCES:
patent: 4470139 (1984-09-01), Munter
patent: 4884264 (1989-11-01), Servel et al.
patent: 4885740 (1989-12-01), Parson et al.
patent: 4905225 (1990-02-01), Francois et al.
patent: 4933932 (1990-06-01), Quinquis et al.
Pending U.S. patent application Ser. No. 07/638,872 (Munter).
Published Canadian Patent Application Ser. Nos. 2,003,259* (Fukaya) May/90, 2,006,102* (De Somer) Jun./90, 2,006,392* (Lobjinski) Jun./90.
Published Japanese Patent Application Ser. Nos. J02/206,939 (Okamoto) Aug./90, J02/170,744 (Sumino) Jul./90, J02/142,240 (Uetake) May/90, J01/148,000 (Abe) Jun./89.
Publication entitled "Network, Transport, and Switching Integration for Broadband Communications"* by J. Y. Hui, IEEE Network, Mar. 1989, pp. 40-51.
Publication entitled "Input Versus Output Queueing on a Space-Division Packet Switch"* by M. J. Karol et al., IEEE Transactions on Communications, vol. COM-35, No. 12, Dec. 1987, pp. 1347-1356, * enclosed.

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