This read-write INTEGER, set to ncdp(1) or manual(2), selects how network clock is distributed for the device, where ncdp mode has the device participate in the NCDP protocol to identify a single master clock source using the cwnAtmSourceTable and cwnAtmInterfaceTable, versus manual mode which uses a different clock source configuration. An admin chooses this based on whether they want automated clock-source arbitration across the network via NCDP or a manually pinned clock source. Switching a device from manual to ncdp(1) mode would activate participation in the network-wide clock election process instead of relying on a fixed local configuration.