Abstract: A mobile telephone handset is provided with a connector (8) and circuitry (18, 19) which permits universal serial bus (USB) and single-ended (SE) modes of data transmission with another device such as a personal computer, another mobile telephone handset or keyboard.

Abstract: The invention relates to universal serial bus circuits utilized in USB devices and USB hubs. Specifically, the invention relates to circuitry used to detect whether the hub or device is connected to a USB host, i.e. to detect connection status of the device or hub. The present invention provides a USB circuit comprising a microprocessor which receives signaling concerning the connection status of the USB circuit to a USB host circuit, first and second data signal lines which transmit respective first and second data signals to the microprocessor, a USB host power supply signal line which receives USB host power signaling to indicate connection status, and wherein the USB circuit analyzes the USB power supply signal line and change the data signal transmittal down the first and second data lines according to the connection status of USB circuit to the USB host circuit.

Abstract: The invention relates to universal serial bus circuits utilized in USB devices and USB hubs. Specifically, the invention relates to circuitry used to detect whether the hub or device is connected to a USB host, i.e. to detect connection status of the device or hub. The present invention provides a USB circuit comprising a microprocessor which receives signaling concerning the connection status of the USB circuit to a USB host circuit, first and second data signal lines which transmit respective first and second data signals to the microprocessor, a USB host power supply signal line which receives USB host power signaling to indicate connection status, and wherein the USB circuit analyzes the USB power supply signal line and change the data signal transmittal down the first and second data lines according to the connection status of USB circuit to the USB host circuit.

Abstract: The invention relates to universal serial bus circuits utilized in USB devices and USB hubs. Specifically, the invention relates to circuitry used to detect whether the hub or device is connected to a USB host, i.e. to detect connection status of the device or hub. The present invention provides a USB circuit comprising a microprocessor which receives signaling concerning the connection status of the USB circuit to a USB host circuit, first and second data signal lines which transmit respective first and second data signals to the microprocessor, a USB host power supply signal line which receives USB host power signaling to indicate connection status, and wherein the USB circuit analyzes the USB power supply signal line and change the data signal transmittal down the first and second data lines according to the connection status of USB circuit to the USB host circuit.

Abstract: The invention relates to universal serial bus circuits utilized in USB devices and USB hubs. Specifically, the invention relates to circuitry used to detect whether the hub or device is connected to a USB host, i.e. to detect connection status of the device or hub. The present invention provides a USB circuit comprising a microprocessor which receives signaling concerning the connection status of the USB circuit to a USB host circuit, first and second data signal lines which transmit respective first and second data signals to the microprocessor, a USB host power supply signal line which receives USB host power signaling to indicate connection status, and wherein the USB circuit analyzes the USB power supply signal line and change the data signal transmittal down the first and second data lines according to the connection status of USB circuit to the USB host circuit.

Abstract: The invention relates to universal serial bus circuits utilized in USB devices and USB hubs. Specifically, the invention relates to circuitry used to detect whether the hub or device is connected td a USB host, i.e. to detect connection status of the device or hub. The present invention provides a USB circuit comprising a microprocessor which receives signaling concerning the connection status of the USB circuit to a USB host circuit, first and second data signal lines which transmit respective first and second data signals to the microprocessor, a USB host power supply signal line which receives USB host power signaling to indicate connection status, and wherein the USB circuit analyzes the USB power supply signal line and change the data signal transmittal down the first and second data lines according to the connection statas of USB circuit to the USB host circuit.

Abstract: A transceiver interface operating in accordance with the USB protocol includes a reduced number of pin outs by replacing a logic pair of single ended outputs Vp and Vm with a sole single ended zero output Se0. The interface is intended to form part of a USB device incorporated in apparatus such as a cellular radio telephone.

Abstract: The invention relates to universal serial bus (USB) circuits utilised in USB devices and USB hubs. Specifically, the invention relates to circuitry used to detect whether the hub or device is connected to a USB host, i.e. to detect connection status of the device or hub. The present invention provides a USB circuit comprising a microprocessor adapted to receive signalling concerning the connection status of the USB circuit to a USB host circuit, first and second data signal lines adapted to transmit respective first and second data signals to the microprocessor, a USB host power supply signal line adapted to receive USB host power signalling to indicate connection status, and wherein the USB circuit is characterised by comprising connection status signalling means adapted to analyze the USB power supply signal line and change the data signal transmitted down the first and second data lines according to the connection status of USB circuit to the USB host circuit.

Abstract: A transceiver interface (9) operating in accordance with the USB protocol includes a reduced number of pin outs by replacing the prior art logic pair of single ended outputs Vp and Vm (16,17) with a sole single ended zero output SeO (21). The interface (9) is intended to form part of a USB device incorporated in apparatus such as a cellular radio telephone (22).