B&B Electronics EIR608-4SFP - Manual - Manual (Page 25)

Manual Documentation Number: EIR608-xSFP_4812m 17
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Coupling Ring Application
If the network has more than one X-Ring group, the coupling ring function is
used to connect them and add redundancy. This ensures that transmissions
between the two ring groups will not fail. The figure below is an example of
the coupling ring application.
Dual Homing Application
The Dual Homing function is used to prevent a connection loss between the
X-Ring group and the upper level/core switch. Assign a port in each X-ring
group to be the Dual Homing ports The Dual Homing function can only be
used when the X-Ring function is active. Each X-Ring group can have one
Dual Homing port. Note: The upper level switches must have RSTP
enabled.