INSTALLATION
Network Example
Use of private IP addresses is strongly recommended when configuring a SpeedNet Radio
network. The following example of a SpeedNet Radio network uses several private IP subnets
from the 192.168.0.0 block of private addresses.
The SpeedNet Radio network, depicted in Figure 1, contains three Ethernet segments. The
first segment uses the 192.168.200.0 Class C subnet, encompassing a range of addresses from
192.168.200.1 to 192.168.200.254. The second segment uses the 192.168.201.0 Class C subnet,
encompassing a range of addresses from 192.168.201.1 to 192.168.201.254. The third segment
uses the 192.168.202.0 Class C subnet, encompassing a range of addresses from 192.168.202.1 to
192.168.202.254. All three segments share the 192.168.203.0 Class C subnet for their wireless
interfaces. It is over this common subnet that traffic is routed between Ethernet segments.
Figure 1. Multi-Network SpeedNet Radio Example, with Automatic Switch Controls (lED).
Once the individual data networks are established, it is recommended that you plan an IP
addressing scheme. In Figure 1 each SpeedNet Radio host ID is 1, while the IED's host ID is 2.
Following a numbering scheme such as this will make it easier to keep track of which IP
addresses are used for each device.
The SCADA network in this example uses the 192.168.203.0 subnet. This subnet is different
than the subnets used for the Ethernet segments. The wireless interface of the SpeedNet Radio
from Subnet 1 is assigned an address of 192.168.203.1. The wireless interface of the SpeedNet
Radio from Subnet 2 is assigned an address of 192.168.203.2. The wireless interface of the
SpeedNet Radio from Subnet 3 is assigned an address of 192.168.203.3.
You may find it helpful to draw a diagram as a planning aid when designing your SCADA
network. Such a diagram will not only help in planning the networks, it will be a reference guide.
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