A wiper system and a control method thereof are provided. The piston valve mechanism includes a cylinder bore that connects a medium pressure chamber and a low pressure chamber, and a piston valve and a spring accommodated with the cylinder bore. Each packet has a source and a destination. A controller electrically communicates with the optical filter to select individual optical channels from the portion of the wavelength division multiplexed optical signal received through the filter input port; each selected optical channel is output via a filter throughput port. A limit mean is defined which is equal to one half of the sum of minimum frequency and maximum frequency and is less that the arithmetic mean. The reception system also includes a modified legacy VSB receiver for processing the data received from the VSB transmission system in a reverse order of the VSB transmission system by using the sequence, and a demultiplexer for demultiplexing the data from the modified legacy VSB receiver into the MPEG data and the supplemental data.