This read-write value enables or disables Adaptive Coding and Modulation (ACM) on the radio link, per its ExaltEnableT syntax. An admin turns it on so the radio automatically shifts to a more robust (lower-throughput) modulation scheme when link conditions degrade, and back to a higher-throughput scheme when conditions improve, instead of running a fixed modulation at all times. For example, enabling ACM lets the link automatically fall back during heavy rain fade and recover full capacity once the weather clears.