Local area network with an active star topology comprising ring

Details Local area network with an active star topology comprising ring Local area network with an active star topology comprising ring

1988-12-29

1991-08-20

Hecker, Stuart N.

Boots, shoes, and leggings

3642216, 3642217, 3642293, 364230, 364240, 3642407, 3642411, 3642418, 364242, 36424295, 370 60, 370 941, G06F 1516, G06F 1130, G06F 1336, G06F 1300

Patent

active

050419633

ABSTRACT:
A star local area network includes a ring bus hub (4) capable of being connected to a plurality of nodes (3, 5, 9) geographically distant from the hub by means of low speed serial links (18, 19, 21, 28). The nodes include processor means (2, 30, 31) for creating messages for transfer on the network. A plurality of duplex communication links (18, 19, 21, 28) connect the nodes to the ring bus hub (4). The hub (40) is comprised of a plurality of ring controllers (10, 12, 14, 16) driven by a common clock source (7). Each ring controller is connected by means of a number of parallel lines to other ring controllers in series to form a closed ring. Each one (3) of the plurality of nodes is geographically distant from the hub (4) and is connected to a corresponding one (10) of the ring controllers by means of one (18, 19) of the duplex communication links. The node controllers including node interface means (40) for transmitting the messages as a contiguous stream of words on the duplex communication link. The ring controllers include ring bus interface means (42) for forming the messages into discrete data packets for insertion onto the ring bus and means (32, 34) for bufferring data messages received form the node and over the ring bus.

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patent: 4835673 (1989-05-01), Rushby et al.
patent: 4888726 (1989-12-01), Struger et al.

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