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EDS-408A/405A Series User’s Manual Featured Functions
3-18
When the number of EDS units in the Turbo Ring is odd.
Master
Segment N+1
If there are 2N+1 EDS units (an odd number) in
the Turbo Ring, with EDS units and segments
labeled counterclockwise, then segment N+1
will serve as the backup path.
For the example shown here, N=1, so that
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 figure
below illustrates how to couple two Turbo Rings.
ATTENTION
In the VLAN environment, the user must set “Redundant Port,” “Coupling Port,” and “Coupling
Control Port” to join all VLANs, since these ports act as the “backbone” to transmit all packets
of different VLANs to different EDS units.
Ring Coupling
Switch A: "Coupler"
Switch B
Switch D
Coupling Port
Switch C
Main Path
Coupling Port
Backup Path
Coupling
Control Port
To support the Ring Coupling function, select two EDS units (e.g., Switch A and B in the above
figure) in the Turbo Ring and another two EDS units in the adjacent Turbo Ring (e.g., Switch C
and D).