Black Box LRA005A-R2 - Manual (Page 71)

ASYNC ROUTER AR-P, AR-5, AND SYNC ROUTER USER’S MANUAL
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A.2 Synchronous LAN-to-LAN
This example illustrates how the Sync Router uses its integrated modem as a backup for a synchronous
connection. Consider the network and the routing tables given for the systems in Figure A-5.
Figure A-5. Modem as a Backup for a Synchronous Connection.
host1 host2
128.66.1.1
Sync Router A
10.4.0.106
sync0
Internet
home office
128.66.1.2
Sync Router B
sync0 modem0
Public Switched
Telephone
Network
modem0
128.66.14.1
Sync Router C
sync0
branch office
host3 host4