Multiplex communications – Wide area network – Packet switching
Patent
1992-06-24
1994-08-23
Shaw, Dale M.
Multiplex communications
Wide area network
Packet switching
370 941, G06F 1300
Patent
active
053414756
ABSTRACT:
This invention relates to a protocol implemented in a communication system for exchanging data and control messages between adapters to which are attached different users, and a shared memory subsystem comprising a depository storage, a manager of storage and a microprocessor. Such protocol enables the adapters to be the initiators of the transmission and reception of data by using the control lines that connect the manager of storage to all adapters in the same way as the data bus and the address bus. Moreover, the adapters slice the messages into data bursts to which are associated control words specifying the sizes, the owner and the position of the burst in the message. Consequently, those data bursts may be interleaved when transiting on the data bus without the intervention of the microprocessor for the routing, and they will be stored in or read from the depository storage according to the identification of the user in the control word. Therefore, only the shared memory needs to have a high capacity of storage, whereas the manager of storage and the adapters can operate with a reduced capacity of storage, and the time to send or to access a data burst is much more improved.
REFERENCES:
patent: 4797815 (1989-01-01), Moore
Austruy Pierre
Brezzo Bernard
Calvignac Jean
Lips Jean-Pierre
Naudin Bernard
Bhatia Gaurav
Cockburn Joscelyn G.
International Business Machines - Corporation
Shaw Dale M.
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