BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates an exemplary ring network system.
FIG. 2 is a table for explaining K1 byte and K2 byte.
FIG. 3 is a diagram illustrating an exemplary configuration of a node device.
FIG. 4 is a diagram (1) illustrating exemplary operations of node devices.
FIG. 5 is a diagram (2) illustrating exemplary operations of node devices.
FIG. 6 is a flowchart illustrating an exemplary operation of a first node device.
FIG. 7 is a flowchart illustrating an exemplary operation of a second node device.
FIG. 8 is a diagram for illustrating a 2F-BLSR.
FIG. 9 is a diagram (1) illustrating the redundancy capabilities of a 2F-BLSR network.
FIG. 10 is a diagram (2) illustrating the redundancy capabilities of a 2F-BLSR network.
FIG. 11 is a diagram illustrating an exemplary line test.