Abstract: A broadcast system may have an out of band return path and the out of band return path may be used for communications with digital services provided by the broadcast system. For example, the broadcast system may provide a file transfer digital service to a user of the broadcast system and the out of band return path may be used to communicate acknowledgments back to the broadcast system during a file transfer process. In one implementation, the broadcast system may be an Advanced Television Systems Committee (ATSC) 3.0 television broadcast system. A method for using the out of band return path to interact with the digital service is disclosed.

Abstract: A heartbeat system and signaling protocol for a digital broadcast system that provides a unicast return path signaling protocol. In one embodiment, the digital broadcast system may be an ATSC 3.0 compliant broadcast system.

Abstract: A broadcast system may have an out of band return path and the out of band return path may be used for communications with digital services provided by the broadcast system. For example, the broadcast system may provide a file transfer digital service to a user of the broadcast system and the out of band return path may be used to communicate acknowledgments back to the broadcast system during a file transfer process. In one implementation, the broadcast system may be an Advanced Television Systems Committee (ATSC) 3.0 television broadcast system. A method for using the out of band return path to interact with the digital service is disclosed.

Abstract: A universal serial bus (USB) protection circuit. The circuit includes a V+ line, a ground line, a D+ line, a D? line, a first resettable device, a second resettable device, a windowing comparator, a first switch, and a second switch. The V+ line is configured to be connected to a V+ connection of a USB cable. The ground line is configured to be connected to a ground connection of the USB cable. The D+ line is configured to be connected to a D+ connection of the USB cable. The D? line is configured to be connected to a D? connection of the USB cable. The first resettable device is coupled to the V+ line and links the V+ line to a V+ of a local device. The second resettable device is coupled to the ground line and links the ground line to a common node of the local device. The windowing comparator has a negative input coupled to the common node and a positive input coupled to the ground line.

Abstract: A universal serial bus (USB) protection circuit. The circuit includes a V+ line, a ground line, a D+ line, a D? line, a first resettable device, a second resettable device, a windowing comparator, a first switch, and a second switch. The V+ line is configured to be connected to a V+ connection of a USB cable. The ground line is configured to be connected to a ground connection of the USB cable. The D+ line is configured to be connected to a D+ connection of the USB cable. The D? line is configured to be connected to a D? connection of the USB cable. The first resettable device is coupled to the V+ line and links the V+ line to a V+ of a local device. The second resettable device is coupled to the ground line and links the ground line to a common node of the local device. The windowing comparator has a negative input coupled to the common node and a positive input coupled to the ground line.