An optical network includes an optical ring and a plurality of adddrop nodes coupled to the optical ring. The charging unit has a power converter for converting an input voltage to a desired output voltage. The first conductive member is at least part of a first power transmission line. The valve assembly dispenses a conically-shaped spray at a rate of about 2 to about 0. In response to different displaying modes, the TV system selectively invokes one of the two header sets to select different portions of the single pixmap.