This read-write Integer32 (131-510) sets the low end of the reserved LCN range for a resource partition, where the LCN identifies the local VCI value used on VISM when adding a connection. An admin cares because this value, together with vismResPartLcnHigh, defines the specific block of virtual channel identifiers reserved for this partition's connections. For example, an operator setting up two separate resource partitions on the same port would set non-overlapping vismResPartLcnLow/High ranges to avoid VCI collisions between the partitions.