EDS-518A Series User’s Manual

Featured Functions

When the number of EDS-518A units in the Turbo Ring is odd.

Master

Segment N+1

If there are 2N+1 EDS-518A units (an odd number) in the Turbo Ring, with EDS-518A units and segments labeled counterclockwise, then segment N+1 will serve as the backup path.

For the example shown here, N=1, and therefore N+1=2.

For some systems, it may not be convenient to connect all devices in the system to make one BIG redundant ring, since some devices could be located in a remote area. The “Ring Coupling” function of Turbo Ring can help you separate those distributed devices into different smaller redundant rings, but in such a way that they can still communicate with each other. The following figure illustrates how to couple two Turbo Rings.

ATTENTION

In a VLAN environment, you must set “Redundant Port,” “Coupling Port,” and “Coupling Control Port” as “Trunk Port,” since these ports act as the “backbone” to transmit all packets of different VLANs to different EDS-518A units.

Ring Coupling

Switch B

Switch D

Main Path

Coupling

Control Port

Backup Path

Coupling Port

Switch A: "Coupler"

Switch C

To support the Ring Coupling function, select two EDS-518A (e.g., Switch A and B in the above figure) in the Turbo Ring and another two EDS-518A in the adjacent Turbo Ring (e.g., Switch C and D).

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