2 optical receive module, automatically or manually switched, hot backup power supply, 2 return transmission modules, 4 forward. CSP8500 Optical Working StationSummary4 output, 45/87 ... , imperial F type female port,FC/APC or SC/APC connector,rated output level104dBuV(input optical power -2dBm), outdoor waterproof housing,AC135~250V ...