Moxa Technologies EDS-518A Series - Manual (Page 34)

EDS-518A Series User’s Manual Featured Functions
3-19
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 A: "Coupler"
Switch B
Switch C
Switch D
Main Path
Coupling Port
Backup Path
Coupling
Control Port
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).