... J2284 stard fieldbus etc.Independent dual bus electric interface 2 fiber interfaces, with redundancy dual-bus structure fiber optic redundancy ring network ... interface and 2 fiber interfaces, with redundancy dual-bus structure and fiber optic redundancy ring network function, which supply ... rate, use for chain, star, ring, and other network structure, multi-mode fiber 0~2Km, single-mode fiber 0~20Km ...