Usage: Usage: In order to make transmission transmissions in base stations and telecom plants, digital distribution box 2 mbit-pcm cable is wound on DDF module terminals by using DDF gun. This allows transmission over the DDF module. The DDF module has ultrasonic welded connectors with 2 micron nickel and 0.2 micron thick hard gold coating. The undercoat coating of the body of the DDF module is galvanized coated hair. The 2 mbit / s ddf module is mounted on the left and right sides of the left, ddf roof, and the lid opens left and right.