HYBREX DK3-21 - DK9-25 and DK9-DSS Installation; Connecting DK9-25 with DK9-DSS

DK9-25 and DK9-DSS:
 Connect Digital Key Telephone – DK9-25 to G2-STU2 or G1E-STU Card as the
following Diagram.
 And then connect the DK9-DSS through the DSS expansion port of DK9-25.
 Fix the connection kit by screws.