This variable reflects the status of the DPT/OPP jumper on the board. This jumper controls the behavior of the converter when a loss of signal is detected. When the jumper is in the default OPP position, the loss of signal detect on one port causes only the opposite port to be shut down. In this case, Port Shutoff is said to be
disabled(2). In the DPT (
enabled(1)) position, both ports are shut down. Use of the DPT position is discouraged, as it is more likely to lead to a signal loss condition from which the converter is unable to recover.