Multiplex communications – Wide area network – Packet switching
Patent
1992-10-22
1995-02-07
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 851, 370 859, 370 8515, 361796, 361803, 439 61, 327365, H04B 302, H04L 520
Patent
active
053880994
ABSTRACT:
A backplane wiring scheme is provided for use in a hub of a packet data communications system. Line cards are connected to the backplane wiring arrangement in the hub, where each line card is a coupling to a network segment, a station or a to a bridge to other stations or segments. The connection is usually in either a ring or a bus topology, and increased flexibility, reduced power consumption, and easier implementation are provided by a unique wiring scheme. Each line card has a number of receive ports (e.g., N-1) and has two transmit ports, the transmit ports including a transmit-left port and a transmit-right port. The receive ports and transmit ports are arranged in a regular linear pattern on an edge of each of said line cards. The line cards are inserted in backplane slots, and backplane wiring paths are configured diagonally between ports of the cards to connect the transmit-left ports of the line cards to receive ports of line cards to the left and to connect the transmit-right ports of the line cards to receive ports of line cards to the right. When the transmit-left port and the transmit-right port of each of the line cards are connected together, the line cards are thereby configured as a bus. When only the transmit-left port and a top one of the receive ports are activated for all of the line cards, and the transmit-right port of only the left-most line card, are activated, the line cards are thereby configured as a ring.
REFERENCES:
patent: 3992686 (1976-11-01), Canning
patent: 4658333 (1987-04-01), Grimes
patent: 4885741 (1989-12-01), Douskalis
patent: 5103378 (1992-04-01), Stowers et al.
patent: 5122691 (1992-06-01), Balakrishnan
Cefalo Albert P.
Dagg David A.
Digital Equipment Corporation
Johnston A. Sidney
Olms Douglas W.
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