The CCI-22 connects two 2-wire full duplex party-line circuits with the matrix. The interface supports Clear-Com signaling to and from the matrix system, deriving its power from the external party-line circuit. Levels and cable nulling are completely adjustable. The CCI-22 functions with Clear-Com and other two-wire intercom systems. Does not power the Party Lines attached to CCI-22 modules. These require Encore Master Station PSUs such as the PK-7, PS-702 or MS-702.