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CHAPTER2 Ethernet Unit
■ Example 2
In this example, many controllers are operated with the HUBs connected in cascade.
* The cascade port, also sometimes called an UPLINK port or MDI port is used when
connecting multiple HUBs in cascade. Straight-through cables are used to connect the
cascade ports of the HUBs together. However, crossover cables are used when con-
necting HUBs not having cascade ports or when making cascade connections without
using cascade ports.
* A maximum of 4 HUB units can be connected in cascade.
* The same type network can also be built up by stacking HUBs together using so-called
stackable HUBs. In this case, Multiple HUBs connected in a stack are seen as just one
large HUB by the network so there is no limit on the number of HUB units that can be
stacked.
PC Controller
HUB
HUB
Crossover cable
Straight-through cable
Cascade port (UPLINK port, MDI port)
HUB with cascade port
PC
Controller 1
Controller 2
:
Controller 9
Controller 10
IP address
192.168.0.2
192.168.0.3
192.168.0.4
:
192.168.0.11
192.168.0.12
Subnet mask
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
192.168.0.1
192.168.0.1
:
192.168.0.1
192.168.0.1
System setup example