3-FTCU operating instructions
4.4 EST3 System Operation Manual
Operation
The operational status of the phone system can be determined by
using the 3-FTCU LCD display.
Normal condition
When there is no activity on the system the screen appears as
shown in Figure 4-2. The top line indicates that there are no
incoming calls pending.
[3FTCUOP3.CDR]
Pending Call Counter
Phone System Statu
Title Block
Unit: ok
0 Calls Pending
Figure 4-2: Normal 3-FTCU Display
The bottom line indicates the 3-FTCU unit status. “OK” means
that there are no troubles with the phone system.
Trouble condition
When there is a fault on the firefighter telephone system, a fault
indication will appear on the bottom of the display, as shown in
Figure 4-3. Local faults may appear on the second line of the
display. Circuit faults require the use of the 3-LCD display
module to find the specific cause of the problem.
[3FTCUOP8.CDR]
Pending Call Counter
Local Trouble Indicator
Phone System Status
Title Block
Unit: Trouble
0 Calls Pending
Handset Off Hook
Figure 4-3: Trouble 3-FTCU Display.
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