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The LC-3 has two front panel LEDs. The “POWER” LED lights to show the unit is powered up. The “IN USE” LED lights
whenever any of the phones are in use.
A. Front Panel LEDs
Any of the three emergency phones can make an outbound call to the phone line through the LC-3. If a second emer-
gency phone attempts to make a call while another emergency phone is in use, the LC-3 will provide a busy signal
until the line is available. Viking emergency phones can be programmed to redial on busy, this way the second emer-
gency phone will continue to try until it is able to place a call for help.
B. Outbound Calls
The LC-3 immediately answers the ringing line and gives a double beep indicating it has answered. The person call-
ing in then has 4 seconds to enter a single touch tone “1”, “2” or “3” before it drops the line. If a single touch tone is
detected, the LC-3 will ring-through to emergency phone port 1, 2 or 3 respectively. All Viking emergency phones are
set up to automatically answer a ringing line. Once answered, the inbound call has talk path to that emergency phone.
C. Inbound Calls
The Fire Floor Phone port provides 32 volts of DC talk battery to operate a Fire Floor Phone (any standard single line
touch tone phone can be used). When the Fire Floor Phone comes off-hook, the LC-3 gives a double beep. At any
time, a single touch tone “1”, “2” or “3” can be entered to call emergency phone port 1, 2 or 3. This means emergency
personnel do not even need to hang up the Fire Floor Phone to call another emergency phone. It is recommended the
Fire Floor Phone has access limited to authorized personnel only. It would also be beneficial to mark the Fire Floor
Phone as such, and label the touch tone keypad as to which elevators of the three keys dial.
D. Fire Floor Phone
If power is lost to the LC-3, all three emergency phones will be connected directly to the phone line within the LC-3.
In this state any of the three emergency phones can make an outbound call to the phone line through the LC-3 even
though the LC-3 has no power. A second emergency phone could then barge into the same call, but Viking emergency
phones have a privacy feature that prevents this from happening. Additional emergency phones can make their own
call for help, once the line is again available. If the Fire Floor Phone functionality is required during a power outage,
the LC-3 needs to be plugged into an uninterruptable back-up power supply (UPS) so that power is not lost.
E. Power Fail Condition
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