Hirschmann RS20 Reference Manual page 151

Redundancy 6.1 Ring Redundancy
Note: When activating the HIPER-Ring function via software or DIP
switches, the device sets the corresponding settings for the pre-defined ring
ports in the configuration table (transmission rate and mode). If you switch off
the HIPER-Ring function, the ports, which are changed back into normal
ports, keep the ring port settings. Independently of the DIP switch setting, you
can still change the port settings via the software.
RM GUI L2E
151
Release 8.0 05/2013