Glensound GDC-6432-dCCU/AIO2 Analogue Audio Input/Output BoardThe dCCU is an AES system as standard. There are 8 AES inputs and outputs (16 channels in and 16 channels out). Each pair of AES I O can be replaced by a stereo analogue pair of I O. Standard system is: 8 AES inputs and 8 AES outputs. Add 1 x AIO2 card 7 x AES inputs and outputs 2 x analogue inputs and outputs Add 2 x AIO2 cards 6 x AES inputs and outs 4 x analogue inputs and outputs .. and so on. As an AES connection is 2 channels, replacing this