2 optical receive module, automatically or manually switched, hot backup power supply, 2 return transmission modules, 4 forward. CSP8500 Optical Working StationSummary4 output, 45/87-862MHz, 2 optical receiving module, 2 retrun path transmitter, 2 power supply module, built-in status monitor, HMS, power supply backup module and response module are optional, imperial F type female port,FC/APC or ...