... Optical wavelength: Multi-mode 850nm, 1310nm; Single-mode 1310nm, 1550nm.Ø Transmission fiber: Multi-mode 50/125 um, 62.5/125 um, 100 ... , industrial terminal interface. Ø Relay alarm out put: optical fiber link failure and power failure alarm output, the maximum capacity ... ring, and other network structure, multi-mode fiber 0~2Km, single-mode fiber 0~20Km, more remote optional, optical interface type ...