Chapter 4. Applications
Bisync Application
The FSU can be used to connect IBM 3780/2780 (see IBM manual number GA27-3004-2) bisync controllers and a host across a frame 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 the frame relay network. In a multi-point configuration the FSU performs local spoofing, minimizing traffic across the frame relay 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-point application.
DLCI=17DLCI=120
FRAME RELAY
UNIUNI
RFC1490/LLC2
DTE1 | Bisync | | | |
| | | |
N | | | | |
| | | |
| | | | |
DTE2 | | FEP | | Host |
| | | |
| | | | |
FSU | | | | |
Figure 4-3
Bisync Point-to-Point
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