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Ring network switch without optical module

You can implement a ring network using standard Ethernet switches without optical modules by using protocols like Device Level Ring (DLR) or Ethernet Ring Protection Switching (ERPS) to ensure redundancy and fast failover.

Using Copper Ethernet in Ring Topologies

A ring network does not inherently require fiber optics; it can operate over copper Ethernet connections if the switches support ring protocols. Each switch in the ring must have at least two Ethernet ports to connect to its neighboring nodes, forming a closed-loop topology. This setup allows data to travel in both directions, providing redundancy in case of a link or node failure .

Protocols for Redundancy

  • Device Level Ring (DLR): A Layer 2 EtherNet/IP protocol designed for industrial networks. DLR enables fast fault detection and automatic reconfiguration when a link fails. One switch acts as a ring supervisor, monitoring the network and coordinating recovery, while other switches act as ring participants. Non-DLR switches can be included but may affect recovery time .
  • Ethernet Ring Protection Switching (ERPS): Similar to DLR but optimized for Ethernet networks, ERPS provides rapid failover and ensures continuous service even if a section of the ring fails .

Switch Requirements

  • Managed switches are recommended to support ring protocols and allow configuration of ring supervision and fault detection.
  • Redundant gateways can be configured to connect the ring to the broader network, providing additional resiliency.
  • Industrial-grade switches may be preferred in harsh environments for reliability, even if optical modules are not used .

Practical Considerations

  • Ensure all switches in the ring support the chosen redundancy protocol.
  • Avoid broadcast storms by properly configuring ring protection features.
  • Copper-based rings are suitable for short to medium distances; for longer distances or higher bandwidth, fiber may still be preferred.
  • Ring networks can be scaled by isolating multiple rings, each with its own supervisor, to prevent protocol conflicts . By using standard Ethernet switches with DLR or ERPS, you can achieve a self-healing ring network without optical modules, maintaining high availability and fast recovery in industrial or enterprise environments.

Ring network switch without optical module - TKMM Photonics Systems Sp. z o.o. [PDF]

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