Abstract: An improved USB connection is disclosed that includes a pair of host parallel resistors connected to the USB connection at the host termination and a pair of peripheral parallel resistors connected to the USB connection at the peripheral termination. During high speed operation, the parallel resistors are switched to ground. Another aspect of the present invention is a voltage pull up apparatus for a USB connection. The apparatus includes a pull down resistor connected to the USB connection, a trickle current source attached to the USB connection, and a boost current source attached to the USB connection.

Abstract: A security device (10) for security a frame or chassis of a caravan or other wheeled vehicle to the ground comprises an elongate securing arm (12) extending substantially transversely of the chassis between two frame members (4) thereof, and an elongate support member (14) extending downwardly into the ground. The support member (14) and the securing arm (12) are made in one piece and the free end of the support member (14) is engaged in the ground. The engagement of the support member (14) is such that withdrawal thereof from the ground requires rotation of the support member (14). At each of its ends, the securing arm (12) carries engagement members (32,34) to engage with, and be locked to, the frame members (4). Although the security device is simple to manufacture and install, it provides a high degree of security.