Indicates that either the configured cycle time or GCL interval does not conform to the granularity of cycle time range. For cycle time till 4ms, granularity is 1000ns. For cycle time between 4ms and 8ms, granularity is 2000ns. For cycle time greater than 8ms, granularity is 4000ns.
Sources for this description
Belden, GarrettCom and Hirschmann IT official standalone MIBsHirschmann MIB copies (LibreNMS/Observium Community)