Cable assembly and signal transmission system using the same

A signal transmission system, comprising:

• a first cable, having two contacts at both ends, for transmitting a first signal;
• a second cable, having two contacts at both ends, for transmitting a second signal;
• and
• a signal transmission system body, for outputting or receiving the first signal and the second signal;
• wherein a differential signal is formed by the first signal and the second signal, and at least one of those contacts is an adjustable contact, the adjustable contact adjusts an electrical length of the first cable or the second cable to control a phase error between the first signal and the second signal;
• wherein the adjustable contact comprising;
• a seating, being hollow prism, having an opening in one side of the seating and a space corresponds to the opening in the seating;
• an axial conductor, electrically connected to the first cable or second cable;
• and
• an adjusting portion, an outer wall of the adjusting portion contacts an inner wall of the seating, the adjusting portion has an adjusting unit, the adjusting unit accommodates at least part of the axial conductor, and the axial conductor contacts an inner wall of the adjusting unit.