The present invention relates to an optoelectrical unit for converting information signals between an electrical signal format and an optical signal format. The proposed unit includes a circuit board, which contains at least one optoelectrical capsule. Each capsule is positioned on the circuit board, such that its footprint towards the circuit board has a smaller area than the area of a largest side of the capsule. Moreover, each capsule includes a feedthrough, which electrically connects one or more components therein to circuitry on the circuit board via a plurality of leads. The feedthrough also contains a shield, which electrically shields at least one signal lead from at least one auxiliary lead. The feedthrough is adapted for positioning the optoelectrical capsule at an arbitrary adapted location on the circuit board.