Method, apparatus and computer program product for redundant ring communication
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United States of America Patent
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Aug 2, 2011
Grant Date -
May 14, 2009
app pub date -
Nov 11, 2008
filing date -
Nov 11, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Sets of communication modules each have a pair of ring-channel ports for a ring-configured channel in a network, a peripheral device port for peripheral device data, and dual-ring ports for an inter-ring channel for the pair of modules. First and second ones of a set of communication modules send duplicate data packets on their respective first and second rings. Responsive to duplicate data packets arriving via the rings at first and second modules in a next set within a predetermined time interval of one another, each of the next modules transmits its ring-channel received data packet out a downstream ring-channel port. Responsive to one of the duplicate packets arriving at the DRP of a module a predetermined time interval before arriving at a ring-channel port of the module, the module sends the corresponding packet received at the DRP out its other ring-channel port and its peripheral device port.
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