Studies on Optical High-Availability Seamless Redundancy (OHSR)

The basic high-availability seamless replication (HSR) protocol utilizes duplicated frame copies of each sent frame for zero fail over time. This ensures that even in cases of a node or connection failure, the destination node would obtain at least one copy of the sent frame, resulting in no network downtime. However, the standard HSR is mostly based on the electrical signal link within the node, which contributes to the output of considerable latency at each node due to frame processing. Therefore, in a large scale HSR ring network, the accumulated latencies become substantial and can also limit the mission-critical real-time application of HSR. In this chapter, we present a novel design for optical HSR (OHSR) that uses beam splitting/combining techniques. The proposed OHSR transfers the frames directly to neighboring nodes without frame processing at each node, thus theoretically creating no latency in either node. Various simulations for network samples have been made to validate the OHSR design and its performance which shows that the OHSR outperforms the regular HSR. Also we implement port locking (PL) algorithm for improving HSR unicast traffic efficiency for connected-ring topology.

Author (s) Details

Ibraheem Raed Altaha
Myongji University, Republic of Korea.

Jong Myung Rhee
Myongji University, Republic of Korea.

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