An OFS in-band communication method and an OFS are disclosed. Rollers secured to the roller shafts bear on a surface within the generally hollow interior of the coupler. The output signals are supplied to a parallel processor, which creates an initial theoretical model and calculates the theoretical optical response. The cooling air flow is created in this case by the fan wheel hub of the fan wheel driven by the electric motor. The present invention relates to methods for evaluating energy loss, chipping resistance, and abrasion resistance of a polymeric material, and the methods include irradiating the polymeric material with X-rays or neutrons to perform X-ray scattering measurement or neutron scattering measurement. Fasteners on the mounting arm clamp the fender to the mounting arm.