The Digital Lynx 4S encompasses the chassis, backplane, control board, power supply and optical ethernet connection for the Digital Lynx acquisition system. Built in features include a 16 bit TTL input port and a clock synchronization connection for linking multiple systems. The 4S version of the Digital Lynx has a four board backplane that can support from 32 up to 64 acquisition channels. AC or DC coupled Input Boards, required for signal acquisition, and Digital Reference Selectors are sold separately.