A method and an apparatus for adjusting a process controller based upon a fault detection analysis. The fibers have excellent physical properties, including superior strength and stretch recovery. Next, a data loss rate is determined on the default path. According to the multiplex information, a channel multiplexing unit time-division multiplexes the SCCH and the SDCH thereby to generate a transmission signal. The fluorescent adhesive layer is mounted to a surface of the insulated layer and covers the LED chip.