The same is true for ring prevention. There is an order of magnitude difference in recovery time between the STP commonly used in campus networks and the ring network protocol in industrial sites. Only by understanding where the gap comes from can you determine which one your production line needs.

Typical recovery times for three mechanisms

Traditional STP relies on timer convergence, the network scale is large, and fault recovery is generally on the order of 30 seconds; RSTP compresses time to the second level through port negotiation; the industrial ring network protocol is simplified for topologies known to be rings, and common engineering specifications are written within 50 ms. The numbers are only for reference. Actual performance is related to the number of nodes and link length, and is ultimately subject to equipment specifications and actual measurements. There is a multiplicative relationship between the convergence time and the number of nodes. When there are more than a dozen nodes in the ring, the second level and the millisecond level are completely different on the production line. The visual camera flow timeout is often exposed earlier than the office business.

The reason why the ring network protocol is more stable in the field

• The topology is fixed as a ring in advance, and the backup path is calculated when it is normal. There is no need to recalculate the entire network in case of failure.
• The number of nodes is usually much less than that of a campus network, and the bandwidth and broadcast overhead occupied by status messages are small.
• The main port and secondary port have clear responsibilities, and there will be no broadcast storm caused by temporary loops during the switching process.
• No manual intervention is required after recovery, and the host computer does not need to re-issue configurations.

Acceptance depends on fiber pulling and counting

It is recommended to select an optical fiber with a real distance, count the port packet loss at the aggregation node, and have the host computer record the number of service interruptions, and write the test start and end times into the acceptance form.Optical fiber project for vehicle monitoring system in highway tunnel in a provinceFor acceptance, the fiber pulling counting method is used, which can explain the problem better than the parameters on paper.

EB-LINK technical support can provide fiber pulling test form templates for ring network projects. If necessary, you can call 0755-83179002 to obtain it.