CTI Products CCU-2 Channel Control Unit - Manual (Page 9)

CCU-2 Hardware Reference Specifications
CTI Products, Inc.
68-11843-100 9
3. Inputs & Outputs
Figure 2 shows the equivalent circuits of the CCU I/O pins.
Figure 2 - I/O Equivalent Circuit
The function of the 12 inputs is as follows:
Input Function
1 Force A 1
2 Force A 2
3 Force A 3
4 Force A 4
5 Force A 5
6 Force A 6
7 Force B 1
8 Force B 2
9 Force B 3
10 Force B 4
11 Force B 5
12 Force B 6
Outputs are pinned out so that adjacent relays can control audio pairs.