Specifications

29
System Layout
Figure 8: A Medium System Involving a Subnet
Figure 9 shows the case of a very large system composed of multiple subnets. In this
system, in addition to the usual computer name and IP address information, you will need
to keep track of at least four different Gateway addresses as well.
In addition, if the VoIP option is being used and the voice traffic is heavy enough to justify
running the VoIP Gateway
1
service on a separate machine from the FSA Server, the
record keeping overhead goes up a great deal more. In addition to the address information
for the second server machine, there will be a second IP address and Gateway address to
keep track of for each Station Transponder Unit in the system.
As you can see already, the comment made at the beginning of this chapter about the work
required to install the FSA system being very much influenced by the design of the
network was not an understatement. Even if the FSA system is being installed on an
existing network, the network questions must be considered and solved before you move
on to trying to install the system.
FSA Server
LAN Switch
Console #1
Console #2
Subnet connecting
fire stations.
Local network
Router
Ethernet
Ethernet
IP Station
Unit #1
IP Station
Unit #2
IP Station
Unit #3
1. This use of the term “gateway” is not related to its use in relation to routers.