A data transmission network having at least two devices to transmit and receive data with the devices connected via a passive transmission device so that the data is transmitted between the devices using the passive transmission device. The door is pivoted upon bearings located at each end of the door. Conversion and call processing circuitry is also disclosed which enables access devices and personal computers to adapt voice information between analog voice stream and digital voice packet formats as proves necessary. The spring force is smaller than a limit force required for actuating the release unit. The phase noise due to eddy currents may be measured and characterized from phase images at selected regions near a vessel of interest. A method for reducing radiated Electro-Magnetic Interference from a wire communication bus transferring data between one or more physically separate modules or units comprises changing a data clock period controlling a rate of data bits on a communications bus.