A cable assembly comprises an insulative, a plurality of contacts received in the insulative housing and a cable extending beyond the insulative housing and electrically connecting with the contacts. The insulative housing has a first mating port, a second mating port and a third mating port located on two opposite sides of the first mating port, respectively. These three ports are insulated with each other. The contacts include a first contact extending into the first mating port, a power contacts extending into the second mating port and a grounding contact extending into the third mating port, by this arrangement, the cable assembly can obtain a well signal transmission quality.