An easy to handle ribbon cable connects the newly developed optional AI4S-192 and AO4S-192. These analog expansion boards having one bracket with 4 stereo TRS jacks offer the same performance as the on-board stereo analog I/O of the HDSP 9632: up to 192 Khz, balanced and 3 different reference levels. With this a maximum of 6 inputs and/or outputs can be achieved.