S&C Instruction Sheet 1074-510 7
Operation
Table 1. OSI Model
Data Unit
Layer
Function
Host lED
(Intelligent
Electronic
Device) Layers
Data
Application
Network process to application.
IntelliRupter® Fault Interrupter/
IntelliTeam® Automatic Restoration
System
Presentation
Data representation and encryption
Session
Interhost communication
Segments
Transport
End-to-end connections and
reliability (UDP/TCP)
Media
SpeedNet
Layers
Packets
Network
Path determination and logical
addressing (IP)
Frames
Data Link
Physical addressing (MAC and LLC)
Bits
Physical
Media, wireless, fiber-optics, and
wire
Network Example
S&C strongly recommends use of private IP addresses
when configuring a SpeedNet ME radio network. The
following example of a SpeedNet ME radio network uses
several private IP subnets from the 192.168.0.0 block of
private addresses.
The SpeedNet ME 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 radios 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 using SpeedNet ME radios.
SpeedNet
1
192.168.203.1
SpeedNet
2
192.168.203.2
SpeedNet
3
192.168.203.3
192.168.200.1
192.168.201.1
192.168.202.1
192.168.200.2
192.168.201.2
192.168.202.2
Radio Network
