ALLNODE-RT: a real time, fault tolerant network

This paper presents a proposed multi-stage switching network for real-time systems which features: priority scheduling scalability, high bandwidth, low latency, fault tolerance, and breaking of lower priority connections. The fault-tolerant approach presented gives continuous availability in the pre...

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Bibliographic Details
Main Authors: Olnowich, H.T., Kirk, D.B.
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
Delay
Fault tolerance
Fault tolerant systems
Hardware
Real time systems
Scalability
Scheduling
Switches
Switching circuits
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Summary:This paper presents a proposed multi-stage switching network for real-time systems which features: priority scheduling scalability, high bandwidth, low latency, fault tolerance, and breaking of lower priority connections. The fault-tolerant approach presented gives continuous availability in the presence of many failures, and the correction time is so rapid that real-time messages can be delivered before their deadlines expire. This is possible because the ALLNODE-RT Network contains numerous alternate paths between any two nodes. The ALLNODE-RT hardware searches for an available, non-failed path and guarantees the meeting of a deadline by dynamically increasing priority as the deadline approaches and breaking lower priority connections. The network is based on the existing ALLNODE Switch concept. The modifications required to evolve to a real-time switch are described, as well as the fault tolerance concepts.< >
DOI:10.1109/WPDRTS.1994.365631