ETS-Lindgren 3158 Biconical Antenna - Manual (Page 16)

Assembly and Mounting Instructions | 16
The Model 2090 (or next generation ETS-Lindgren controller, if
applicable) is a separate component required for operation.
7. Connect the fiber optic polarization cable to the polarization unit
located on the back of the pedestal. Connect the other end to the
Model 2090 Multi-Device Controller.