This setting describes, and lets an admin control, whether a particular POTS line's relay is in normal or closed condition; closed bypasses the LPF (Low Pass Filter) for loop testing. Admins set this to closed when they need to run closed-loop testing on that line, and set it back to normal manually or let the relayActiveDuration timer time out and revert it automatically. For example, a technician diagnosing a DSL issue might set this to closed(2) to bypass the filter and test the raw copper loop, then rely on the timer to restore it to normal(1).