Modular Adaptor, DB9 Male / RJ45 (8x8) Jack (RBA098M) This series is identical to the RA series except for the fact that the thumb-knurl is replaced with a shorter screwhead requiring a screwdriver for fastening to the system. A full range is provided which includes the DB9, DB15 and DB25 interface, available with RJ11/12 or RJ45 jacks. TDT series insertion/extraction tools are necessary for programming.