The ComNet FDX60(M,S)[-M] data transceivers provide point-to-point transmission of simplex or duplex EIA RS232/RS422/RS485 (2W/4W) data signals over one or two optical fibers. The transceivers are transparent to data encoding allowing for broad-range compatibility. Models within this series are available for use with multimode or single mode optical fiber. Features for FDX60 Series Robust design assures extremely high reliability in unconditioned out-of-plant/roadside environments NTCIP compatible Wide optical dynamic range: optical attenuators are never required Status indicating LEDs provide rapid indication of critical operating parameters. Meets EIA RS232C/D and RS422/RS485 (2 or 4-wire) specifications Fiberlink Fiber Link Tester Voltage transient protection on all power and signal input/output lines provides protection from power surges and other voltage transient events. Tested and certified by an independent laboratory for full compliance with the environmental requirements (ambient operating temperature, mechanical shock, vibration, humidity with condensation, high-line/low-line voltage conditions and transient voltage protection) of NEMA TS-1/ TS-2 and the Caltrans Specification for Traffic Signal Control Equipment. Standard ComFit models are hot-swappable. Lifetime Warranty ComFit standard form factor is designed for wall, surface, rack, or DIN rail mount installations (using optional card cage or DIN mounting bracket). Compact form-factor saves space in those installations where space may be at a premium.