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61200.175L1-1 FSU 5622 ESP User Manual 31

Chapter 4. Applications

Bisync Application

The FSU 5622 ESP 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

configurations 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 configura-

tion the FSU 5622 ESP performs local spoofing, minimizing

traffic across the frame relay network. Sample network illustra-

tions 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 multi-point

application.

Bisync Bisync

3780 Controller

FEP Host

DTE1

DTE2

DTE1

DTE2

DLCI=17 DLCI=120

5622 ESP 5622 ESP

RFC1490/LLC2

UNI

FRAME RELAY

Figure 4-3

Bisync Point-to-Point

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