JK Audio Four IFB - Manual (Page 9)

9
Operation (continued) Features
1. IFB Receive volume controls - Controls the level of audio present
on the corresponding IFB XLR output jacks.
2. Monitor Receive volume control - Controls the level of audio pre-
sent on the Monitor Receive XLR output jack.
3. Monitor Send volume control - Controls the level of audio sent
into the phone line from the Monitor Send XLR input.
4. Line LED indicators - These bi-color LED indicators will inform
you of line state at a glance.
Unlit - When the relay that controls the line is in the on-hook
state, the LED will remain unlit.
Green = OK - A green LED means the relay that controls the line
is off-hook and an active phone line is physically connected.
Red = Warning - If the LED lights red this means that there is a
problem with the line. The red LED indicates that the relay that
controls the line is in its off-hook state but there is no active
phone line present.
These LED's also function as visual ring indicators. The LED will
flicker green when ring voltage is present on the corresponding
phone line.
5. Green LED AC indicator - This LED will light green whenever the
unit is connected to an active AC power source, regardless of on/
off power switch position.
6. Red LED power indicator - This LED will light red when unit
power is in the "On" position. If the unit is operating on battery
power, this LED will also indicate the condition of the battery.
The LED will only light red on battery power when voltage level is
>+7 VDC.
7. Power on / off switch