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Chapter 4. Applications
4-14 TSU IQ+ User Manual 61200275L1-1
DBU Application 2 (PRI)
The following application shows the critical configuration for a
case where the Host Site of the frame relay circuit is set up to
restore service (see Figure 4-7). This setup uses a PRI ISDN module
and service so that multiple calls can be placed simultaneously. The
criteria for placing a call are based on Host Site port failure or
individual PVC failure. The individual PVC failure should account
for remote sites port outages and frame relay service troubles.
Figure 4-7. PRI DBU Card at Host Site
Table 4-3, Table 4-4, and Table 4-5 on page 4-15 show example
setups for PRI DBU options at the Host Site. These tables are based
on the example application shown in Figure 4-7.
Router
DTE
NET
DBU
TSU IQ+
SITE A
SITE B
SITE C
ISDN or
POTS Network
Frame Relay
Router
LAN
LAN
Router
LAN
DTE
NET
DBU
TSU IQ+
DTE
NET
DBU
TSU IQ+
16
17
100
101
20 201
BRI
BRI
PRI