Specifications

127
Voice over Radio or VoIP
Voice over Radio
In a system of this type, the individual FSA console positions communicate control and
status request messages with the FSA Server (over the IP network) and then the server
communicates with the individual station units (again over the IP network). The reverse is
true when the station units communicate status information back to the consoles.
Voice audio is transmitted through a radio console, over a radio channel, and received by a
radio connected directly to each station unit. The received voice audio is controlled by the
Model 6203 based on what commands the station unit has received over the IP network.
In the event of a problem occurring with the FSA Server, the server can be shut down and/
or disconnected from the IP network. A properly programmed Model 26 which is
connected to a radio on the same channel used for voice audio distribution can be turned
on and take control of the system using FFSK commands over the radio channel.
Figure 45: IP-FSA System with Radio for Voice Audio (FFSK over Radio for Backup
Control)
Note Keep in mind the fact that the system is “cold-switched” when the
Model 26 takes over. Depending on the size of the system, it may
take several minutes for the Model 26 to poll all of the station
alerting units and capture an accurate picture of the station status
for all of the units.
FSA Client
Console
Audio Interface
Radio
Channel A
Serial CAD
Interface
Model-26
"ColdStart" Radio
Backup
Private IP
Network
Radio Console
4-Wire
Audio
Primary
Voice Radio
Radio Voice
With FFSK Radio
Backup
A
B
M26 Bakup
FFSK / Voice
Radio
Channel A
- Console Channel -
IP FSA
Primary Server
Serial CAD
Translator
4-Wire
Audio
Radio
Channel A
M6203
IP / Radio
With FFSK
Backup
IP
Station
Control