Rev A
Page 1
JA31-N01 Intercom Bus Selector - NVG
SECTION 1 - DESCRIPTION
1.1
Overview
The JA31-N01 Intercom Bus Selector - NVG provides the crew with the ability to manage the intercom amongst up to
six audio controllers in the aircraft. The ICS TIE lines from three or four groups are connected to one of two intercom
buses. Groups three and four can support up to two audio controllers each.
1.2
Features
The JA31-N01 consists of two subassemblies. The main subassembly features a 25 pin D-Min connector, with
backward compatibility to legacy systems. The faceplate subassembly contains the removable legends.
The JA31-N01 is NVIS Type I Class B compliant.
The JA31-N01 legends are directly dimmable from the aircraft lighting bus and may be replaced with legends having
custom markings.
The JA31-N01 features four intercom tie line switches to individually connect each audio controller group to one of two
intercom buses.
The JA31-N01 provides load matching to maintain ICS TIE line audio levels.
The JA31-N01 switching functions are passive and do not require power from the aircraft.
1.3
Inputs and Outputs
Refer to the JA31-N01
connector map
for the mating connector designators and pin assignments for the
input and output signals.
1.3.1
Inputs
Name
Qty
Type
+28VDC LIGHTS INPUT
1
Analog control signal
1.3.2
Outputs
Name
Qty
Type
None
0
N/A
1.3.3
Bi-directional Signals
Name
Qty
Type
USER # ICS TIE HI/LO
4
Audio signal
1.3.4
Terminations
Name
Qty
Type
USER 4 ICS TIE LOAD HI/LO
1
USER 5 TERMINATION A/B
1
USER 6 TERMINATION A/B
1
2.00 kOhm Resistor
Jumper short
configured
Jumper short configured
