12
S&C Instruction Sheet 1075-510
When the individual data networks are established, you should plan the IP addressing
scheme. In Figure 1 on page 7, each SpeedNet SDR Radio host ID is 1 and each automatic
switch control 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
from the subnets used for the Ethernet segments. The wireless interface of the SpeedNet
SDR Radio from Subnet 1 is assigned an address of 192.168.203.1. The wireless interface of
the SpeedNet SDR Radio from Subnet 2 is assigned an address of 192.168.203.2. The wireless
interface of the SpeedNet SDR 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 and reference guide when
designing your SCADA network.
Routing Options
As a router, SpeedNet SDR Radios provide a wireless connection between two or more
separate Ethernet subnets. Data are then routed between the Ethernet subnets. Route
information can be entered manually, or it can be processed automatically by AODV. See
Figure 2 on page 13 for an example of a wireless network using SpeedNet SDR Radios with
AODV.
The type of network you are designing will help determine the best routing mode to use.
If the network consists of stationary SpeedNet SDR Radios that are communicating either
point to point or point to multipoint, choose the
Off
setting for
Ad-Hoc Routing
mode.
This allows you to insert static routes for each SpeedNet SDR Radio and its connected
network. When route redundancy is not required, the
Off
setting is likely the best choice
for
Ad-Hoc Routing
mode. Note that if static routing is selected (ad-hoc routing mode is
off), then all routes that a given radio might need must be specified as static routes. The
radios do not support a mixture of static routes and AODV routing. See Figure 3 on page 14.
When the network consists of meshed SpeedNet SDR Radios, choose
AODV,
the ad-hoc
routing mode. This mode allows the SpeedNet SDR Radios to automatically find their
neighbors and quickly and dynamically update the route tables as the network topology
changes. For environments where routes are required to change dynamically or where
enhanced reliability through redundancy is required, AODV is typically the best ad-hoc
routing mode to choose.
Installation
