This read-write value specifies how many Logical Channel Numbers are available to a given controller on a given port, though for CESM-T3/E3 and CESM-8T1/E1 this value is always 1, since those card types have only one LCN per port available to any single controller. An administrator on a card type supporting multiple LCNs per port per controller would adjust this to allocate more or fewer channel resources to a specific routing controller. On CESM-T3/E3 and 8T1/E1, this fixed value of 1 reflects the hardware limitation that only one controller can effectively use the single LCN on that port at a time.