Installation 1-21Connecting to ISDNFigure 1-9 Connect ISDN Cable Into A Proprietary ISDN Wall BoxConnect the supplied ISDN cable from the ISDN port into the ISDN wallbox. See Figure 1-9 and Figure 1-10. (US models see the note on page 1-6)CAUTION: Do not connect the ISDN line into the AccessBuilder 500’sLAN port as the ISDN line voltage could damage the unit.Figure 1-10 Examples of ISDN Wall Boxes