How to use the size of coupler in the base station room

It depends on the size of the coupling.

The base station computer room is divided into indoor and outdoor, one is without dry amplifier and optical fiber repeater equipment wiring, and the other is with dry amplifier and optical fiber repeater equipment wiring.

Coupler is an electrical-optical-electrical conversion device that uses light to transmit electrical signals. It consists of a light source and a light receiver. The light source and the light receiver are assembled in the same closed housing and separated from each other by a transparent insulator.