Pulsecom OCU-DPL7 industrial communications switch module
Pulsecom model OCU-DPL7 industrial communication board module. This is marked "OCU-DPL7" and "DD0040". This unit is also marked on the back of the board as "Extended Range Adaptive Cable equalizer - model 804DEQ30E".
This is from the estate of an industrial telecommunications engineer and ham radio enthusiast. We don't know much about it. We have not tested it and the box is worn and dirty from storage.