Quadro Manual I: Installation Guide Step 1: Installing the QuadroQuadro2x, 2xi, Quadro4x, 4xi, 4xa, Quadro16x, 16xi; (SW Version 4.1.x) 18Connecting the Hardware• Quadro4x behind a routerQuadro2x and Quadro16x are connected accordingly.Fig. I-11: Installation: Quadro4x behind a router• Quadro4x used as Internet access routerQuadro2x and Quadro16x are connected accordingly.Fig. I-12: Installation: Quadro4x used as an Internet Access Router• Quadro4xi used as Internet access routerAll Quadro ISDN IP PBXs are connected accordingly. They also may be con-nected with its Ethernet WAN port to a router (see Fig.I-9) and additionally, theISDN ports of all Quadro devices may be joined to a PBX with ISDN interfaces.Fig. I-13: Installation: Quadro4xi used as an Internet Access Router