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AssigneeInternational Business Machines Corporation
InventorsRichard S. Crouse, John J. Cazzolla, Luke L. Chang, Marco M. Hurtado, Kha D. Nguyen, Jose L. Rivero, Jose J. Ruiz, Louis Salcedo
Estimating the term…
A sequencing scheme is provided for prioritizing bus operations occurring in simplex switches which interconnect subsystems in a data communications system, thereby yielding improved aggregate system data throughput. The sequencing scheme provides procedures which simultaneously accommodate (i) concurrently pending requests to a first control bus which processes only circuit switched operations and (ii) concurrently pending requests to a second control bus which processes only packet switched operations, in an order which optimizes link level control message throughput of the simplex switch. The control messages which are coordinated by the sequencing scheme include connect and disconnect requests, connect and disconnect request acknowledgments, and data acknowledgments. All connect request and disconnect requests are managed by a connection processing (CP) bus, which operates as a circuit switching bus, and all data acknowledgments and connect request acknowledgments from subsystems attached to a cascaded switch are made over an out-of-band (OB) bus, which operates as a packet switching bus. Because connect and disconnect operations over the CP bus can proceed independently of acknowledgment operations over the OB bus, the sequencing procedures for each of the control buses are permitted to operate independently and simultaneously.
A prioritization scheme for determining a predefined sequential order of processing each contending connection and disconnection request through a simplex switch which is initiated by interconnected subsystems in a data communications system, independent of the order in which said requests are initiated, said prioritization scheme comprising the steps of:
A prioritization scheme for determining the order of processing contending connection and disconnection requests through a simplex switch which are initiated by interconnected subsystems in a data communications system, said data communications system comprises of at least two cascaded simplex switches each having connected thereto at least one interconnected subsystem, said prioritization scheme comprising the steps of:
A prioritization scheme for determining the order of processing contending data acknowledgment and connect request acknowledgment messages through a simplex switch which are initiated by interconnected subsystems in a data communications system, said data communications system being comprised of at least two cascaded simplex switches each having connected thereto at least one interconnected subsystem, said prioritization scheme comprising the steps of:
Dependencies are inferred from the claim text.