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Creating an IFB ( Interrupt
Foldback Bus)

An IFB is a special use of an output port. The person con-
nected to the output port usually hears a program source
connected to some input port of the intercom system. This
program source is then interrupted when a keypanel opera-
tor presses a key to talk to the person. The following proce-
dure lets you define which output port you want to use for
IFB output, and which port will be used for program input.
You can also assign a meaningful name for the IFB. Once
you have configured an IFB, you can assign it to any key-
panel key as described starting on page 2-15.

To set up an IFB:

From the menu bar, select the System menu, then select
“IFB Buses”. The IFB editing screen should appear
(Figure 2-5). Interrupt Foldback Bus Assignments
are shown in the table at the left of the screen. An In-
puts/Outputs pick list is shown at the right. The de-
fault Alpha names for IFBs are IF01, IF02 etc. As
you configure IFBs you will also change the Alphas
to more meaningful names for your intercom system.
The number of available IFBs will vary depending
on the size of your intercom system.

Name the IFB: Use the UP/DOWN cursor keys to select
an IFB Alpha (or click on the desired Alpha with a
mouse). Then, enter a four-digit name for the IFB.
(The IFB Alpha may be the same as the output port
Alpha of the person that will be interrupted during
IFB operation. Just remember that assigning the port
to a talk key will have a different effect than assign-

ing the IFB to a talk key.) When you move the cursor
to a different position, you will notice that the Alias
changes to the same name as the Alpha*. If your in-
tercom system is interconnected (trunked) with an-
other intercom system you may enter a different
Alias name that will be meaningful to personnel in
the other intercom system.

Note

When you make any change to an IFB and move
to a new position, you will notice that a check
mark

û is inserted in the “Chg” column. This

check mark is a change flag. (See the change
flag description on page 1-4 for further details.)

Specify the output port of the person to be interrupted
during IFB: Move to the “IFB Out” column. Type
the Alpha of the output port, or select it from the pick
list at the right side of the screen. In the example in
Figure 2-5, port N033 has been entered as the IFB
output for IF01.

Note

To use the pick list to insert ports into the Inter-
rupt Foldback Bus Assignments table: Position
the cursor in the table at the point where you
want to make the insertion. Then, press the TAB
key to move the cursor into the Inputs/Outputs
pick list (or move the mouse cursor over the pick
list). Select a port from the pick list and press
ENTER (or click on a port with the left mouse
button). The selected port should appear in the
Interrupt Foldback Bus Assignments table.

Except when an Alias has already been entered that is
different from the Alpha. In this case, the Alias will
not change whenever the Alpha is changed.

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Intercom

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Interrupt Foldback Bus Assignments

º º Inputs/Outputs º³

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º ºAlpha ³Port ³

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