61200.130L1-1 FSU User Manual 2 7Chapter 4. ApplicationsBisync ApplicationThe FSU can be used to connect IBM 3780/2780 (see IBM manualnumber GA27-3004-2) bisync controllers and a host across aframe relay network. Point-to-point and multi-point configura-tions are supported at speeds up to 19200 bps. The LLC protocol(mode 2) is used to provide a reliable transport layer across theframe relay network. In a multi-point configuration the FSUperforms local spoofing, minimizing traffic across the framerelay network. Sample network illustrations for both point-to-point and multi-point are shown in Figures 4-3 and 4-4.See Table 4-C for an example configuration for the point-to-pointapplication.Bisync Bisync3780 ControllerFEP HostDTE1DTE2DTE1DTE2DLCI=17 DLCI=120FSU FSURFC1490/LLC2UNIN NUNIFRAME RELAYFigure 4-3Bisync Point-to-Point
