ADTRAN 1200275L1, User Manual

Page: 72 / 198

Chapter 4. Applications
4-12 TSU IQ+ User Manual 61200275L1-1
DBU Application 1(non-PRI)
The following application shows the critical configuration required
for a case where all end points of the frame circuit are equipped
with single call DBU units (see Figure 4-6). This set-up allows any
remote site to place a call to the host site or the host site to place a
call to each remote site based on PVC failure. This set-up also
allows the host to designate primary and alternate sites to call
based on port failure criteria using the call order parameter.
Figure 4-6. Dial Backup Application
Table 4-1 and Table 4-2 on page 4-13 provide example setups for the
DBU O
PTIONS
( C
ONFIG
> D
IAL
B
ACKUP
) and the PVC C
ONFIGURATION
table ( C
ONFIG
> N
ETWORK
P
ORT
> PVC C
ONFIG
). The tables are based
on the example application shown in Figure 4-6.
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
116
117