... bus electric interface 2 fiber interfaces, with redundancy dual-bus structure fiber optic redundancy ring network function, which supply safe efficient ... the rate, use for chain, star, ring, and other network structure, multi-mode fiber 0~2Km, single-mode fiber 0~20Km, more ... the rate, use for chain, star, ring, and other network structure, multi-mode fiber 0~2Km, single-mode fiber 0~20Km, more ...