36 Connection of signals.4.2.3. Internal signal L-502 connector.The internal signal connector means a 40-pin 2-row BH-40 type plug intended for connectinga flat cable inside the system unit. It is possible to use the finished AC-7xx-m or AC-7xx-f cablewith the use of an additional adjacent crate slot in the PC system unit.39 401 23 4579111315681012141617191820212322242527262829313032DO15DO13DO11DO9DO7DO5DO3DO1DO16DO14DO12DO10DO8DO6DO4DO2DI15DI13DI11DI9DI7DI5DI3DI1DI16DI14DI12DI10DI8DI6DI4DI233 3435 3637 38 DGNDDGNDDGNDDI_SYN2DGNDDGND+3,3V+3,3VFig. 4-2: Internal signal connector