ASTi ACU2 Manual

Advanced Simulation Technology inc.
500A Huntmar Park Drive
Herndon, Virginia 20170 USA
Tel. [phone] • Fax. [phone]
www.asti-usa.com
Advanced Simulation Technology inc.
500A Huntmar Park Drive, Herndon, Virginia 20170 USA
Revision L, Version 1 (December, 2017)
ACU2 Technical User Guide
Document: DOC-HW-ACU2-UG-L-1

Product Name: ACU2
ACU2 Technical User Guide
© Copyright ASTi 2017
Restricted Rights: Use, duplication, or disclosure by the Government is subject to restrictions as
set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer Software
clause at DFARS 252.227-7013.
This material may be reproduced by or for the U.S. Government pursuant to the copyright
license under the clause at DFARS 252.227-7013 (1994).
ASTi
500A Huntmar Park Drive
Herndon, Virginia 20170 USA

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Revision history
Date Revision Version Comments
10/4/2017 A 0 Convert original content to XML and edit for grammar
and accuracy.
12/8/2017 L 1 Edit "Analog In" figure in "Control input used as analog
input."

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Contents
1.0 Introduction 1
2.0 Physical description 3
2.1 ACU2 with bezels 3
2.2 ACU2 without bezels 4
2.3 Weight 4
2.4 Front panel 5
2.4.1 Audio interface: DB-15 pinout 5
2.5 Rear panel 6
2.5.1 Serial ports 6
2.5.2 Status indicator lights 7
2.5.3 DIP switch positions 8
2.5.4 ACENet connection 8
3.0 Audio input and audio output 10
3.1 Audio input 10
3.1.1 Microphone power 11
3.1.2 Input frequency response 12
3.2 Audio output 12
3.2.1 Audio isolation characteristics 13
3.2.2 Output frequency response 13
4.0 Control input and output 14
4.1 Control input 14
4.1.1 Control input used as a digital input 15
4.1.2 Control input used as analog input 15
4.2 Digital output 16
4.2.1 Digital output circuitry 16
5.0 Typical headset connections 17

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5.1 Mono headset connection 17
5.2 Stereo headset connection 17
6.0 Software configuration 18
7.0 Earth ground 19
8.0 Firmware updates 20
9.0 Rackmount ACU2s 21
9.1 Power daisy chain 22
10.0 Specifications 23
10.1 Power requirements 23
10.2 Memory devices 23
10.3 Temperature and humidity ranges 24
10.4 Reliability 24
11.0 Warranty information 25
11.1 Repairs and returns 25

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1.0 Introduction
The ACU2 is a compact, 48 kHz digital and audio distribution module that connects remotely
located operator stations and live radios to the ACENet network. The ACU2 is compatible with
the Telestra and Voisus platforms. The ACU2 provides low noise, analog-to-digital conversion,
and low-latency audio distribution.
The ACU2 integrates press-to-talk (PTT) units, volume controls, simulated communication pan-
els, hand-held terminals (HHTs), and live radios into the simulated communications envir-
onment.
The ACU2 supports the following features:
lStereo support: stereo operation (i.e., independent left and right output) is supported on a
single DB-15 connector, which reduces cabling complexity and installation footprint for
applications requiring stereo operators.
lCompact footprint: each device supports four configurable mono or stereo operator pos-
itions in a single compact unit, which fits easily on a desktop. Alternatively, rackmount
two devices side by side in 1U 19" rack space.
lHigh fidelity audio: 48 kHz digital audio and balanced pro-audio interfaces.
lSoftware-based configuration: software-adjustable amplifier or preamplifier gains and
microphone power for easy, direct connection to military and commercial headsets and a
wide variety of audio and communication systems and peripherals.
lSerial data ports: control interface for ASTi HHTs, simulated panels, and live radio con-
trol.
lIntegrated I/O: configurable digital and analog input/output (I/O) for direct connection of
PTT units, volume control, switch detection, radio PTT activation, and other control
applications.
Copyright © 2017 Advanced Simulation Technology inc. 1
ACU2 Technical User Guide (Rev. L, Ver. 1)

The following figure shows an example of an ACU2 hardware configuration:
Figure 1: ACU2 hardware configuration
2 Copyright © 2017 Advanced Simulation Technology inc.
ACU2 Technical User Guide (Rev. L, Ver. 1)

2.0 Physical description
The following sections provide a physical description of the ACU2, including diagrams with
and without bezels, a list of specifications, and diagrams and descriptions of the front and rear
panels.
2.1 ACU2 with bezels
The ACU2 has two bezels, encompassing the front and rear panels. This ACU2 is Conformitè
Europèene (CE)/Restriction of Hazardous Substances (RoHS) certified. Removing the bezels
voids the CE certification. The following figure shows the ACU2 front bezel:
Figure 2: ACU2 front bezel
The following figure shows ACU2 height and width dimensions:
Figure 3: ACU2 height and width dimensions
Copyright © 2017 Advanced Simulation Technology inc. 3
ACU2 Technical User Guide (Rev. L, Ver. 1)