The Model 271AF provides feature packed performance and reliability for data transmission over glass fiber. Fiber optic transmission offers the benefits of wide bandwidth, immunity from EMI/RFI interference, operation in harsh/hostile environments and secure data transmission. The Model 271AF Fiber Optic Line Driver provides full duplex, asynchronous communications over two fibers. Fiber cable length can be up to 2 kilometers with data rates as high as 56 KBPS. The Model 271AF has been optimized for 62/125 fiber cables. Other sizes can also be used. The power budget for the 271AF with 62/125 cable is 12dB. The Model 271AF comes with a wall mounted power pack. The Model 271AF is equipped with a DTE/DCE switch that reverses pins 2 and 3 of the RS-232 connector. The RS-232 port can be implemented as a male or female DB25 connector. The fiber cable port connectors are industry standard ST types.