FOR-22 4-WIRE INTERFACE
2-3
INSTALLING THE FOR-22 IN AN INTERFACE FRAME
IMF-3 INTERFACE FRAME
This section describes how to install an FOR-22 unit in an IMF-3 frame. There
are certain options available on the FOR-22 that can be changed before
installation. The audio output level can be set to different ranges depending on
the type of input is being driven. The input of a channel can have a bridged pad
added to allow higher input levels.
To install the FOR-22 interface module in the IMF-3 interface frame:
1. Select a slot to install the interface in.
2. Remove the blank plate covering the slot.
3. Set any necessary Audio Output Level Jumpers.
4. Set any necessary Audio Input Level modifications.
5. Slide the FOR-22 in the slot and ensure that the card is fully seated.
6. Tighten the FOR-22's front panel mounting screws.
IMF-102 INTERFACE FRAME
The IMF-102 interface frame contains two slots for installing interfaces.
Interfaces are installed horizontally in one rack unit (1 RU) of a standard
Electronics Industry Association equipment rack.
You install the FOR-22 interface in an IMF-102 interface frame as you would
install an interface in an IMF-3 interface frame.
AUDIO OUTPUT LEVEL JUMPER
The audio output is transformer isolated. There is a jumper field for each
channel that allows three basic operating levels depending on what type of
external input is being driven. The following levels can be produced by each
channel:
Line level ----------------------------- 0.0 dBv at 600 ohms
Clear-Com IFB level ------------ -15 dBv at 200 ohms
Microphone level ----------------- -55.0 dBv at 20 ohms
To set channel 1 for the desired level:
1. Find jumper block JP100 on the circuit board.
2. Move the jumper so that it connects the pair of jumper pins labeled with the
desired level (Line, IFB, or Mic).
To set channel 2, repeat the above procedure using JP200.
Each FOR-22 channel can also be adjusted using its "Send" front panel control.
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