Hirschmann RS20 Programming Manual page 58

Ring/Network coupling
Depending on the STAND-BY DIP switch position, the dialog displays
those configurations that are not possible in gray. If you want to select
one of these grayed-out configurations, you put the STAND-BY DIP
switch on the Switch into the other position.
One-Switch coupling
Assign the device the DIP switch setting "STAND-BY", or use the soft-
ware configuration to assign the redundancy function to it.
Two-Switch coupling
Assign the device in the redundant line the DIP switch setting "STAND-
BY", or use the software configuration to assign the redundancy func-
tion to it.
Note: For redundancy security reasons, the combination of Rapid Spanning
Tree and Ring/Network Coupling is not possible.
58
5.2 Preparing a Ring/Network coupling
Redundanz L2P
Release 5.0 04/09