This read-only value reports the number of DE channels that have been configured for use, which in turn controls the amount of RAM the node allocates for data encryption at initialization. An admin cares about this because setting it too high wastes memory reserved at boot time, while too low limits how many encrypted channels can later be brought into service without reinitializing the node. For example, if only 50 encrypted channels are expected in production, configuring this to 50 rather than the hardware max of 500 conserves RAM allocated during startup.