Abstract: Provided is a telecommunication apparatus and a telecommunication method accomplishing a one-to-many, many-to-one, and many-to-many simultaneous accesses in a power line telecommunication of a code division multiple access (CDMA) by using an AC power line (including the ground).

Abstract: The present invention provides a transmission unit that can realize a high speed-shifting ratio, can realize reduced size, low cost and low noise, and is also capable of limiting slip loss. Outer peripheral surfaces of a small diameter rolling element and a supplementary rolling element are brought into contact with an outer peripheral surface of a large diameter rolling element. The supplementary rolling element is arranged at an almost opposite side to the small diameter rolling element, thus enclosing the large diameter rolling element between the small diameter rolling element and the supplementary rolling element. An inner peripheral surface of the pressure adjustment ring is brought into contact with the outer peripheral surface of the small diameter rolling element and the outer peripheral surface of the supplementary rolling element, and is supported by them.