27.3.1 Normal operation of the ring
The following figure shows normal operation for a single ring.
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![[Figure Data]](./GRAPHICS/ZU117270.GIF)
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(1) Master node operation
To prevent fault misdetection due to one-way link faults, health check frames are sent from two ring ports. Monitoring is performed to check that health check frames in both directions are received within the pre-determined time. Data frame transfer is performed on the primary port. Because the secondary port is logically blocked, data frame transfer and MAC address learning are not performed.
(2) Transit node operation
Health check frames sent by the master node are not monitored on transit nodes. When a health check frame is received, it is transferred to the next node in the ring. Data frame transfer is performed on both ring ports.