Modular electrical jack connector system comprising at least one jack connector housing and at least one therein inserted jack connector subassembly wherein each jack connector housing comprises a front coupling side having at least two openings which openings are disposed one above the other to receive a variety of electrical plug connectors through the front coupling side and an oppositely disposed rear side for insertion of at least one jack connector subassembly wherein further each jack connector subassembly comprises a longitudinal strip-like carrier having a substantially right-angled profile and further on the upper side and on the lower side respectively a series of extrusion-coated or injection-molded jack terminals which at a front end of the strip-like carrier form uncoated, bent-back cantilevered contact portions.