Method and apparatus for cut-through data packet transfer in a b

Details Method and apparatus for cut-through data packet transfer in a b Method and apparatus for cut-through data packet transfer in a b

1992-06-25

1994-04-26

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370 8513, 370 83, H04J 322

Patent

active

053073452

ABSTRACT:
A technique for reducing latencies in bridge operation, by facilitating cut-through transmission of a receive data packet while the packet is still being received, but without the need for starting or ending delimiters,or packet lengths, in the packet data. The technique can be applied to packets inbound from a network, packets outbound to a network, or packets being looped back to a client to which the bridge is connected. In the technique of the invention, each received packet is stored in a buffer memory and a count is maintained of the number of bits in the received packet. A transmit operation is started as soon as possible, preferably while the packet is still being received, and bytes are retrieved from the buffer memory for transmission. The transmit operation is terminated when a transmit byte count reaches the packet length as determined by the receive byte count. For cut-through operations, the transmit operation is started without knowledge of the packet length, but the packet length is made available to the transmit operation upon completion of the receive operation. For store-and-forward operations, the packet length is stored with the packet in the buffer memory, and retrieved for use in the transmit operation.

REFERENCES:
patent: 3979733 (1976-09-01), Fraser
patent: 4071706 (1978-01-01), Warren
patent: 4603416 (1986-07-01), Servel et al.
patent: 5132964 (1992-07-01), Esaki
patent: 5140584 (1992-08-01), Suzuki
patent: 5161193 (1992-11-01), Lampson et al.

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