A controlled-impedance cable assembly for removably attaching a controlled-impedance cable to a surface of a device. Signal contacts are attached to signal conductors of cables and ground members are coupled to shields of the cables. Ends of the signal conductors and of elongated appendages extending from the ground members are positioned to make a pressure contact to pads and ground lands on the surface. Pressure to make those contacts may come from deflection of the ends of the signal conductors and elongated ground appendages or from a spring. The signal contacts and elongated appendages may be positioned to provide an impedance matching an impedance with the cables.