Abstract: A three phase to single phase automatic transfer switch for providing power to at least one single phase power load from one of a primary and a secondary source of three phase power. The automatic transfer switch includes three pairs of switches, wherein each pair of switches is connectable to the primary and the secondary sources of three phase power, wherein each switch operates in unison with the other switch within its pair, wherein each pair of switches is connectable to a different one of the at least one single phase power load, and wherein each pair of switches is operable independently of the other pairs of switches.

Abstract: A keyboard-mouse-video (KVM) system. The system includes a KVM switch having a first controller; a ROC unit having a second controller; and a cable which connects the ROC unit to the KVM switch, the cable having four pairs of wires. The first controller is configured to transmit and the second controller is configured to receive an Ethernet signal using a first pair of wires. The second controller is configured to transmit and the first controller is configured to receive a serial signal using a second pair of wires.

Abstract: A three phase to single phase automatic transfer switch for providing power to at least one single phase power load from one of a primary and a secondary source of three phase power. The automatic transfer switch includes three pairs of switches, wherein each pair of switches is connectable to the primary and the secondary sources of three phase power, wherein each switch operates in unison with the other switch within its pair, wherein each pair of switches is connectable to a different one of the at least one single phase power load, and wherein each pair of switches is operable independently of the other pairs of switches.

Abstract: A keyboard-mouse-video (KVM) system. The system includes a KVM switch having a first controller; a ROC unit having a second controller; and a cable which connects the ROC unit to the KVM switch, the cable having four pairs of wires. The first controller is configured to transmit and the second controller is configured to receive an Ethernet signal using a first pair of wires. The second controller is configured to transmit and the first controller is configured to receive a serial signal using a second pair of wires.

Abstract: A standby power supply system is provided which prevents saturation of magnetic components thereof during its initial start-up. The power supply system includes a variable frequency inverter that is responsive to control signals for generating an initial frequency which is higher than the frequency of the utility line voltage and which is swept down gradually to the frequency of the line voltage when a detected logic signal is at the low logic level.