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CHAPTER2 Ethernet Unit
■ Example 4
In this example, a dial-up router is used to operate a controller in a remote location
over an ISDN line.
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Controller
Controller
ISDN public telephone line
Head office
Factory
DSU
DSU
ISDN dial-up router
ISDN dial-up router
HUB
HUB
PC
PC
ISDN dial-up router
ISDN dial-up router
ISDN dial-up router
Head office router
PC
Factory router
Controller 1
Controller 2
Controller 3
IP address
192.168.0.1
192.168.0.2
192.168.1.1
192.168.1.2
192.168.1.3
192.168.1.4
Subnet mask
255.255.255.0
255.255.255.0
255.255.255.0
255.255.255.0
255.255.255.0
255.255.255.0
Gateway
192.168.0.1
192.168.1.1
192.168.1.1
192.168.1.1
System setup example
(Head office network: 192.168.0.0/24, Factory network 192.168.1.0/24)
* The dial-up router must be set so that data destined for 192.168.0.0/24 is sent to the head
office, and data destined for 192.168.1.0/24 is sent to the factory.