Wiring Diagram Intercom System - WIRING Suite Stations - may be wired in risers as shown in the wiring layout diagram, Fig. 1. Each riser requires one twisted pair, #22 (or as required for type of station) plus one conductor,. Purchased as a replacement door station for a Linear system dmc1 house intercom/music. The front door bell on original unit was no longer working (after 7 years from original installation)..