A coated base fabric for airbags, which is fabricated by applying a resin elastomer to a base fabric formed of flattened cross-section yarns having a degree of filament cross-section flatness of from 1. The coupling element is formed from a deformable yet substantially incompressible material and features a number of raised members projecting toward the optical fibers. Based on the CRC modulo, the target port of the received data frame is found from a routing table. The inventive method is carried out with gentle mixing so as to avoid molecular degradation of the additive.