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JA94-001A Dual Audio Controller
SECTION 1 - DESCRIPTION
1.1
System Overview
The JA94-001A dual audio controller is a centralized management system for two independent users that distributes
and controls all transceiver, receiver and warning source audio in an aircraft. It enables the selected transmission of
microphone audio to one or more transceivers and distributes all intercom audio. The JA94-001A dual audio controller
can be used in a standalone configuration or a star configuration to prevent the loss of the entire system due to the
failure of one controller. It provides a passive emergency mode that directs the Right User to the COM1 transceiver
and NAV1 receiver, and the Left User to COM2 transceiver and NAV2 receiver.
The JA94-001A is set up on a per-installation basis using a configuration cable and a PC running the product
configuration tool to download system configuration settings via the front panel music / configuration connector. To
facilitate future customizations and certification, neither software nor complex electronic devices are used in the JA94-
001A design.
1.2
Features Overview
The JA94-001A is comprised of four main subassemblies: the upper (receive) subassembly features a 37 pin D-Min
connector, which interfaces to the radio receive audio and user phones. The lower (transmit) subassembly features a
50 pin and 15 pin D-Min connectors which interfaces to the power and passenger headset connections. This layout
minimizes crosstalk and follows industry standard interconnect for multi-user single channel audio controllers. The
middle (microphone) subassembly has microphone and VOX circuitry. The front (faceplate) subassembly contains the
removable legend interface. Numerous input and output levels are adjustable and several audio paths are selectable
using the configuration tool ProCS™ (Product Configuration Software) to write configuration commands via a
configuration cable to the front panel music / configuration connector. The configuration commands set the level of
non-volatile digital control potentiometers to control audio signal levels and to non-volatile expander latches which are
connected to audio gates to control the audio signal routing.
The JA94-001A supports up to 6 transceivers, each selectable from two rotary switches.
The JA94-001A supports up to 4 selectable receivers in two banks of 4 switches.
The JA94-001A provides intercom functions for up to 2 users and up to 6 passengers.
The JA94-001A has individual VOX gating for each user and passenger.
The JA94-001A supports two Direct Audio inputs
t
o
Le
f
t and Right U
sers in Normal and Emergency mode.
The JA94-001A supports a third Direct Audio input in Normal mode only.
The Direct
A
udios may be routed to both Left and Right User phones or Direct Audio 2 routed to Right User and Direct
Audio 1 to Left User.
All Users can hear Direct Audio 3.
The JA94-001A allows the receive audios to be disconnected from the Passenger Phones.
The JA94-001A supports two CVR outputs.
The JA94-001A allows transmit access for five crew members (Right User, Left User, Passenger 1, Passenger
2, and
Passenger 6).The JA94-001A allows ICS PTT access for all users and passengers.
The JA94-001A features a Music / Configuration connector on the faceplate for configuration of audio levels and
routing. The port can also be used as a music input and is compatible with most music players.
The JA94-001A has three modes of operation: Normal Mode, Emergency Mode and ICS Isolate Mode.
The JA94-001A supports radio simulcast.
The JA94-001A supports a remote transmit select input.
