Multiplex communications – Wide area network – Packet switching
Patent
1992-07-24
1994-03-01
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
370 601, H04L 1256
Patent
active
052914828
ABSTRACT:
A fast packet switch comprising one buffer directly connected between a plurality of input ports and a plurality of output ports to effect rapid throughput of data packets. A pointer to a location in the buffer is allocated by a buffer manager upon receipt of notification of an incoming packet at the receiving input port and the input port delivers the packet as it is received to the location designated by the pointer. After the data packet is received, the input port delivers the pointer and a destination address for the packet to a router, which selects one of the plurality of output ports based on the destination address. The router queues the pointer in a queue for the selected output port. The output port then retrieves the data packet from the buffer using the pointer to determine the location, and transmits the data packet. After the transmission is complete, the output port returns the pointer to the buffer manager. This packet switch may be pipelined to receive, route, and transmit simultaneously on adjacent data packets.
REFERENCES:
patent: 4322843 (1982-03-01), Beuscher et al.
patent: 4751697 (1988-06-01), Hunter et al.
patent: 4780870 (1988-10-01), McHarg et al.
patent: 4821259 (1989-04-01), DeBruler et al.
patent: 5210743 (1993-05-01), Eilenberger et al.
patent: 5212686 (1993-05-01), Joy et al.
McHarg Christopher G.
Newman Thomas E.
Schaff Kenneth N.
Wendland Kenneth E.
AT&T Bell Laboratories
Chin Wellington
Johannesen Michael B.
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