A circular connector (10, 13) comprising: a generally cylindrically shaped insulative housing (16, 20) having a power contact portion of the housing (16, 20) and a signal contact portion of the housing (16, 20), signal contact cavities (17, 22) within the signal contact portion of the housing (16, 20) the cavities consisting of four signal contact cavities (17, 22), the signal contact portion being separately defined; a signal contact assembly (18, 24) within the signal contact portion of the insulative housing (16, 20), the signal contact assembly (18, 24) having rod-shaped signal contact members (12, 15) consisting of four signal contact members (12, 15) within the respective four signal contact cavities (17, 22), the signal contact members (12, 15) are arranged in close proximity to, spaced from and generally parallel to one another in a square pattern, a housing (38, 40) of shaped dielectric material encasing the signal contact members (12, 15), the signal contact assembly (18, 24) further including a generally circular cross-sectioned cylindrically shaped conductive shield (42, 44) in contact with the dielectric material housing (38, 40) at a location spaced outwardly of the signal contact members (12, 15); four rod-shaped power contact members (11, 14), each within the four respective power contact cavities (46, 48), each at a location outside of the signal contact portion of the housing (16, 20) and arranged in an arcuate array that has a general C-shape that defines an inside curve that faces said signal contact assembly (18, 24); and a locking connector (62, 64, 66) that is rotatably affixed to the generally cylindrically shaped insulative housing (16, 20), characterized in that the generally circular cross-sectioned cylindrically shaped conductive shield (42, 44) has lines of indentation in a side wall parallel to the longitudinal axis of the generally circular cross-sectioned cylindrically shaped conductive shield (42, 44), the lines of indentation consisting of four lines of indentation equally spaced around the periphery of the generally circular cross-sectioned cylindrically shaped conductive shield (42, 44). a generally cylindrically shaped insulative housing (16, 20) having a power contact portion of the housing (16, 20) and a signal contact portion of the housing (16, 20), signal contact cavities (17, 22) within the signal contact portion of the housing (16, 20) the cavities consisting of four signal contact cavities (17, 22), the signal contact portion being separately defined; a signal contact assembly (18, 24) within the signal contact portion of the insulative housing (16, 20), the signal contact assembly (18, 24) having rod-shaped signal contact members (12, 15) consisting of four signal contact members (12, 15) within the respective four signal contact cavities (17, 22), the signal contact members (12, 15) are arranged in close proximity to, spaced from and generally parallel to one another in a square pattern, a housing (38, 40) of shaped dielectric material encasing the signal contact members (12, 15), the signal contact assembly (18, 24) further including a generally circular cross-sectioned cylindrically shaped conductive shield (42, 44) in contact with the dielectric material housing (38, 40) at a location spaced outwardly of the signal contact members (12, 15); four rod-shaped power contact members (11, 14), each within the four respective power contact cavities (46, 48), each at a location outside of the signal contact portion of the housing (16, 20) and arranged in an arcuate array that has a general C-shape that defines an inside curve that faces said signal contact assembly (18, 24); and a locking connector (62, 64, 66) that is rotatably affixed to the generally cylindrically shaped insulative housing (16, 20), a signal contact assembly (18, 24) within the signal contact portion of the insulative housing (16, 20), the signal contact assembly (18, 24) having rod-shaped signal contact members (12, 15) consisting of four signal contact members (12, 15) within the respective four signal contact cavities (17, 22), the signal contact members (12, 15) are arranged in close proximity to, spaced from and generally parallel to one another in a square pattern, a housing (38, 40) of shaped dielectric material encasing the signal contact members (12, 15), the signal contact assembly (18, 24) further including a generally circular cross-sectioned cylindrically shaped conductive shield (42, 44) in contact with the dielectric material housing (38, 40) at a location spaced outwardly of the signal contact members (12, 15); four rod-shaped power contact members (11, 14), each within the four respective power contact cavities (46, 48), each at a location outside of the signal contact portion of the housing (16, 20) and arranged in an arcuate array that has a general C-shape that defines an inside curve that faces said signal contact assembly (18, 24); and a locking connector (62, 64, 66) that is rotatably affixed to the generally cylindrically shaped insulative housing (16, 20),