This invention relates to novel sulfur-containing silane coupling agents, and organic polymers containing carbon-carbon double bonds. The DAC is employed in a pipeline stage of an analog to digital converter. The rotor is journalled on the output shaft, and the magnetic brake further includes a stator that is secured in the housing. Such measurements can be performed for a wireless optical telecommunication system, in situations where it may be difficult or impossible to access both sides of a window to place or retrieve measurement equipment. The dielectric member also has transformer portions for reducing reflection of signals passing through the network.