This invention includes an improved child-resistant medicant package. The optical source signal may be used to generate first optical signals that are transmitted from the CMOS chip to optical fibers coupled to the CMOS chip. The rate of the variable rate coder is set by examining the amount of space remaining in a data packet, which is at least partially comprised of data frames produced by the variable rate coder. The striking surface attachment is one of several selectable attachments, each with different performance characteristics, e. The air outputted from the second heat exchanger is cooled by a cooler and a third heat exchanger, is adiabatically expanded by an expansion turbine to be cooled to \u221285\xb0 C.