Unique index to identify the slot number of the coupling link port. This value is never greater than hmSysGroupCapacity. Note that row creation is done only by writing to hmRingCplRowStatus.
Sources for this description
Belden, GarrettCom and Hirschmann IT official standalone MIBsHirschmann MIB copies (LibreNMS/Observium Community)Netdisco MIB archive copies