Abstract: An avionic connector interface distribution unit interfaces a central controller with a plurality of avionic devices. The distribution unit comprises a large avionic connector (16), a mother input/output (I/O) printed wiring board (18), first and second daughter I/O printed wiring boards (20, 22), first and second parallel headers (28, 30) formed of matable connector pairs, and a plurality of miniature connectors (14). The mother board (18) includes first and second planar surfaces, and each of the daughter boards (20, 22) includes first and second planar surfaces. The first and second daughter boards (20, 22) are generally co-planar and adjacent to each other, and these daughter boards (20, 22) are parallel to the mother board (18). The second surface of the mother board (18) faces the first surfaces of the daughter boards (20, 22). The first header (28) is situated between and mounted to the second surface of the mother board (18) and the first surfaces of the first daughter board (20).