An electrical connector having a plurality of connector units each having a pair of columns of edge coupled differential signal pairs separated by a ground shield terminal. The ground shield terminals each face a different signal pair of terminals in an adjacent column. Notwithstanding the different size and configurations of the ground and signal terminals, the terminals have mounting tail portions that are disposed in a uniform array different from the arrangement of the body portions of the terminals of the connector unit. The mounting tail portions are of a reduced length which benefit the electrical performance of the connector where it meets its supporting circuit board.