JPS NXU-2A User manual

Interoperability Now!
INTEROPERABILITY NOW
Installation and Operation Manual
NXU-2A
Network Extension Unit
JPS Interoperability Solutions
5800 Departure Drive
Raleigh, NC 27616
919-790-1011
Email: [email protected] / [email protected]
www.jpsinterop.com
JPS P/N 5041-200200 Revision 2.03 January 2019

NXU-2A Operations Manual
ii Interoperability Now!
FEDERAL COMMUNICATIONS COMMISSION
(FCC) COMPLIANCE NOTICE:
RADIO FREQUENCY INTERFERENCE NOTICE
This equipment has been tested and found to comply with the limits for a Class
A digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when
the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed and
used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case users will
be required to correct the interference at their own expense.
CAUTION
Changes or modifications to this equipment not expressly approved by JPS
Interoperability Solutions could void the user’s authority to operate this
equipment.
NOTICE
JPS Interoperability Solutions reserves the right to make changes to the
equipment and specifications without prior notice.
PROPRIETARY STATEMENT
The information contained in this manual is the property of JPS
Interoperability Solutions and is intended for the purchaser’s use only. It may
not be reproduced without the expressed written consent of JPS
Interoperability Solutions.
© 2019 JPS Interoperability Solutions.
JPS Interoperability Solutions
Phone: [phone]
Fax: [phone]
E-mail: [email protected] / [email protected]
5800 Departure Drive
Raleigh, NC 27616

NXU-2A Operations Manual
Interoperability Now! iii
Table of Contents
1GENERAL INFORMATION ......................................................................................................................1-1
1.1 SCOPE...................................................................................................................................................1-1
1.2 DESCRIPTION ........................................................................................................................................1-1
1.2.1 NXU General...................................................................................................................................1-1
1.2.2 NXU-2A Description .......................................................................................................................1-1
1.3 NETWORK DETAILS ..............................................................................................................................1-2
1.4 APPLICATIONS ......................................................................................................................................1-3
1.5 SPECIFICATIONS....................................................................................................................................1-4
1.6 EQUIPMENT AND ACCESSORIES SUPPLIED ............................................................................................1-5
1.7 OPTIONAL EQUIPMENT -NOT SUPPLIED ...............................................................................................1-5
2INSTALLATION..........................................................................................................................................2-1
2.1 GENERAL..............................................................................................................................................2-1
2.2 UNPACKING AND INSPECTION...............................................................................................................2-1
2.3 RESHIPMENT OF EQUIPMENT ................................................................................................................2-1
2.4 INSTALLATION OVERVIEW....................................................................................................................2-2
2.5 INSTALLATION CONSIDERATIONS .........................................................................................................2-3
2.5.1 Internal Configuration ....................................................................................................................2-6
2.6 POWER REQUIREMENTS........................................................................................................................2-7
2.7 INSTALLATION CHECKLIST ...................................................................................................................2-7
2.8 REAR PANEL ADJUSTMENTS AND CONNECTORS...................................................................................2-7
2.8.1 DC Input Connector, J6 ..................................................................................................................2-7
2.8.2 Audio Level Adjustment Potentiometers and Input Test Point ........................................................2-8
2.8.3 Connection to Radio or Other Four-Wire Device (J7)....................................................................2-8
2.8.4 Network Connection, J3..................................................................................................................2-8
2.8.5 Serial Port Connection, J4..............................................................................................................2-9
2.8.6 Connecting Equipment and Computers to an NXU-2A...................................................................2-9
3CONFIGURATION......................................................................................................................................3-1
3.1 GENERAL..............................................................................................................................................3-1
3.2 CONFIGURATION DETAILS ....................................................................................................................3-1
3.3 SERIAL PORT CONFIGURATION.............................................................................................................3-1
3.3.1 Configuration Using an RS-232 Terminal Program.......................................................................3-2
3.3.2 Command Summary ........................................................................................................................3-4
3.3.3 Setting Unit IP Address...................................................................................................................3-5
3.3.4 Setting Unit Subnet Mask and Gateway Address ............................................................................3-5
3.3.5 Using DHCP to Assign IP Parameters ...........................................................................................3-5
3.3.6 Setting VoIP Port (Optional)...........................................................................................................3-5
3.3.7 Client/Server Selection....................................................................................................................3-6
3.3.8 COR and VOX Settings ...................................................................................................................3-6
3.3.9 Duplex Setting.................................................................................................................................3-6
3.3.10 VOX Hang Time..............................................................................................................................3-7
3.3.11 COR Inhibit Time............................................................................................................................3-7
3.3.12 Serial Port Settings .........................................................................................................................3-7
3.3.13 Voice Compression Settings............................................................................................................3-8
3.3.14 Security Settings..............................................................................................................................3-8
3.3.15 Ethernet MAC Address....................................................................................................................3-8
3.3.16 Command Port................................................................................................................................3-9
3.3.17 Input Level Boost +20db.................................................................................................................3-9
3.3.18 TX Delay .........................................................................................................................................3-9
3.3.19 RX Delay .........................................................................................................................................3-9

NXU-2A Operations Manual
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3.3.20 VMR.................................................................................................................................................3-9
3.3.21 VOX and VMR Sensitivity Adjustments ...........................................................................................3-9
3.3.22 Restoring Factory Defaults .............................................................................................................3-9
3.4 NETWORK MANAGEMENT:SNMP SUPPORT .......................................................................................3-10
3.5 COMMUNICATIONS MODE...................................................................................................................3-11
3.5.1 Store Setup Changes with SAVE Command ..................................................................................3-12
3.5.2 NXU-2A Configuration Using the NXU-2A Setup Utility..............................................................3-12
3.6 NETWORK CONFIGURATION................................................................................................................3-15
3.7 I/O DESCRIPTIONS..........................................................................................................................3-15
3.7.1 Audio Input....................................................................................................................................3-16
3.7.2 Audio Input Test Point...................................................................................................................3-16
3.7.3 Audio Output .................................................................................................................................3-16
3.7.4 COR Input......................................................................................................................................3-16
3.7.5 AUX Inputs....................................................................................................................................3-16
3.7.6 PTT Output....................................................................................................................................3-16
3.7.7 AUX Outputs..................................................................................................................................3-16
4OPERATION.................................................................................................................................................4-1
4.1 GENERAL ..............................................................................................................................................4-1
4.2 FRONT PANEL INDICATORS...................................................................................................................4-1
4.2.1 Power LED......................................................................................................................................4-1
4.2.2 Link Active LED ..............................................................................................................................4-1
4.2.3 Channel Active LED........................................................................................................................4-1
4.2.4 Audio Input LED..............................................................................................................................4-1
4.3 REAR PANEL CONNECTORS,ADJUSTMENTS AND LEVEL POTENTIOMETERS .........................................4-1
4.4 NXU-2AOPERATION ...........................................................................................................................4-1
4.4.1 Operation at Power-Up...................................................................................................................4-2
4.4.2 Input/Output Level Adjustments ......................................................................................................4-2
4.4.3 COR Input Description....................................................................................................................4-2
4.4.4 RS-232 Serial Data..........................................................................................................................4-2
4.4.5 Auxiliary I/O....................................................................................................................................4-3
4.5 CONTROLLING CONNECTIONS...............................................................................................................4-3
4.5.1 Serial or Telnet Control...................................................................................................................4-3
4.5.2 Web Browser Control......................................................................................................................4-4
4.6 SECURITY..............................................................................................................................................4-5
4.6.1 Password Setting .............................................................................................................................4-5
4.6.2 Web Access with Password Protection............................................................................................4-6
5NXU-2A TROUBLESHOOTING................................................................................................................5-1
6NXU-2A FAQ (FREQUENTLY ASKED QUESTIONS)...........................................................................6-1
6.1 GENERAL ..............................................................................................................................................6-1
7THEORY OF OPERATION........................................................................................................................7-1
8INDEX............................................................................................................................................................8-1

NXU-2A Operations Manual
Interoperability Now! v
List of Figures
FIGURE 1-1 NXU-2ABASIC BLOCK DIAGRAM...................................................................................................1-2
FIGURE 1-2 SIMPLE NXU-2ARADIO SYSTEM ....................................................................................................1-3
FIGURE 2-1 OUTLINE DIMENSIONS..........................................................................................................................2-4
FIGURE 2-2 CONTROL AND CONNECTOR LOCATIONS..............................................................................................2-5
FIGURE 2-3 NXU-2A INTERNAL VIEW ...................................................................................................................2-6
FIGURE 2-4 DTE VERSUS DCE SERIAL CABLES...................................................................................................2-10
FIGURE 3-1 MTTTY TERMINAL SCREEN................................................................................................................3-2
FIGURE 3-2 NXU-2A SETUP SCREEN....................................................................................................................3-12
FIGURE 3-3 NXU-2A TERMINAL SCREEN.............................................................................................................3-13
FIGURE 3-4 NXU-2A HISTORY SCREEN ...............................................................................................................3-14
FIGURE 3-5 NETWORK CONFIGURATION SCREEN..................................................................................................3-15
FIGURE 4-1 NXU-2A CONNECTION MANAGEMENT SCREEN ..................................................................................4-4
FIGURE 4-2 NETWORK PASSWORD DIALOG............................................................................................................4-6
List of Tables
TABLE 1-1 SPECIFICATIONS...............................................................................................................................1-4
TABLE 1-2 EQUIPMENT AND ACCESSORIES SUPPLIED .................................. ERROR!BOOKMARK NOT DEFINED.
TABLE 1-3 OPTIONAL EQUIPMENT -NOT SUPPLIED ..................................... ERROR!BOOKMARK NOT DEFINED.
TABLE 2-1 BASIC INSTALLATION CHECKLIST....................................................................................................2-7
TABLE 2-2 NXU-2APINOUT (J7)......................................................................................................................2-8
TABLE 2-3 J4 SERIAL PORT PINOUT ..................................................................................................................2-9
TABLE 5-1 TROUBLESHOOTING .........................................................................................................................5-1

NXU-2A Operations Manual
vi Interoperability Now!
Glossary
Glossary
COR
Carrier Operated Relay
A signal from a receiver that gives a positive indication
that a carrier or signal is being received and that the
receiver is unsquelched. It has the same function as
Carrier Operated Squelch (COS).
COS
Carrier Operated
Squelch
See COR.
DHCP
Dynamic Host
Configuration Protocol
A method of automatically assigning an IP address to an
Ethernet device at startup time. This method conserves
IP addresses in networks where devices do not stay
connected permanently.
DSP
Digital Signal Processor
A type of microprocessor, which is optimized for signal
processing functions.
IP
Internet Protocol
A protocol designed to allow communications between
computers on different networks.
LAN
Local Area Network
A group of computers and associated devices that share a
common communications line, typically within a small
geographic area.
PTT
Push-to-talk
A signal to a radio transmitter, which controls the actual
transmission of radio frequency energy over the air. Also
called a keyline.
TCP
Transmission Control
Protocol
An additional layer to the Internet Protocol, which
ensures delivery of packets, sent across the network. It
can handle situations such as lost packets or packets
arriving out of order.
UDP
User Datagram Protocol
An additional layer to the Internet Protocol which does
not ensure delivery of packets but which offers much
lower transmission overhead than TCP.
VoIP
Voice over Internet
Protocol
Also called Voice over Packet (VoP), a method of
sending voice communications across a digital network.
WAN
Wide Area Network
A network, which is spread out over a wider area, such
as around a city or state. It may include other public or
shared networks.

Interoperability Now!
1General Information
1.1 Scope
This instruction manual provides the information necessary to install and operate the NXU-2A
Network Extension Unit.
1.2 Description
1.2.1 NXU General
NXU stands for Network Extension Unit. NXU units connect communications equipment to a
digital network using VoIP (Voice over Internet Protocol) technology. NXU units use JPS’
proprietary technology, embodied in a family of hardware and software products that enable
voice communications devices to be interconnected via a network across the room or around
the world. VoIP is a means of digitizing voice signals and transmitting them over a digital
network, such as a LAN, WAN, or even the Internet itself.
1.2.1.1 Advantages of NXU Technology
➢Enables the design of low cost, extremely flexible radio communications networks.
➢Multiplexes voice audio and data over a standard Ethernet network.
➢Uses existing network infrastructure eliminating the need for leased lines and
microwave sites.
➢Eliminates the requirement for pilot tones and other in-band signaling.
➢Facilitates centralized control of a communications network from a single computer.
1.2.2 NXU-2A Description
The NXU-2A is intended for use with radio communications consoles, communications radios,
and JPS products such as the ACU-1000 Interconnect Unit. A general-purpose stand-alone
device interfaces full duplex audio, one RS-232 port, and three status bits onto an Ethernet
network. A pair of NXU-2As can form a simple system that creates a transparent
communications link between the two. The NXU-2A at one end (usually the equipment end) is
the server; the one at the other end (usually the operator end) is the client. The audio, RS-232,
and status bits are transparently transferred between the server and the client.
Any NXU-2A can be set up as a server or as a client depending on system needs. The RS-232
interface allows for different baud rates between the server and the client.
The NXU-2A monitors its network connection and adjusts its parameters automatically to
provide optimum performance under varying network conditions. Front panel indicators
display the unit’s status. Initial configuration is done through the NXU-2A’s serial port, but

NXU-2A Operations Manual
1-2 Interoperability Now!
following this initial setup, a standard web browser can be used over the network to view and
change the unit’s settings and also to perform diagnostic tests.
Designed for years of continuous operation in mission-critical applications and remote
locations, the NXU-2A has no moving parts and requires no periodic shutdown or maintenance.
Start up upon power on is typically 5 seconds.
1.3 Network Details
The NXU-2A is a 10/100BASE-T Ethernet device and each unit has a unique Ethernet address
and an RJ-45 physical interface jack. A 10/100BASE-T device operates at either 10 or 100
Mbps and interconnects to an Ethernet hub or switch using standard CAT 5 twisted pair cable,
also known as UTP. The maximum cable length between an NXU-2A and its hub port is 100
meters. With the right connective equipment (recommended or supplied by JPS), the NXU-
2A’s Ethernet port can be linked with virtually any LAN, WAN, or the Internet, no matter
which topology or cabling system is in use.
Audio In
Audio Out
RS-232
COR
PTT
AUX In
AUX Out
Ethernet
NXU-2
Figure 1-1 NXU-2A Basic Block Diagram

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1.4 Applications
Figure 1-2 below illustrates a basic NXU-2A application in which a communications
transceiver is connected via a network to a remote audio console. The transmit/receive audio
and PTT/COR signals are transported digitally across the network and appear at the other end.
The network data transfer is transparent to the user, and the operator at the audio console can
use the radio as if it were located right beside him.
Audio
Console NXU-2 NXU-2 Transceiver
LAN/WAN
Audio Audio
PTT/COR PTT/COR
Figure 1-2 Simple NXU-2A Radio System

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1-4 Interoperability Now!
1.5 Specifications
Table 1-1 Specifications
RX Audio Input
Input impedance
Balanced 47k ohms, transformer coupled.
Input Level
Incoming signals adjustable from –30 to +11 dBm to set 0 dBm nominal input;
+15 dBm clipping. +20 dB boost configurable
Frequency Response
10 Hz to 3600 Hz +/- 2dB.
TX Audio Output
Output Impedance
Unbalanced 10 ohms, AC Coupled.
Output Level
Adjustable from –30 to +11 dBm, 0 dBm nominal factory default; +15 dBm
clipping into a 600 ohm load.
Frequency Response
10 Hz to 3350 Hz +/- 2dBm.
Distortion
0.5% or less (excepting Vocoder).
COR & AUX Input
Input impedance
47k ohm pull-up to +5V.
Polarity
COR: Selectable active low or active high; AUX Inputs: Active low.
Threshold
+2.5V nominal.
Protection
Up To + 100 VDC.
PTT and AUX Output
Output Type
Open drain, 47k ohm pull-up to +5V.
Maximum Sink Current
100 mA.
Max Open Circuit Voltage
+60 VDC.
Serial Interface
Interface Type
RS-232, Asynchronous, Full Duplex.
Baud Rates
300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps.
Connector
DB-9 Male, Standard PC/AT DCE Pinout.
Network Interface
Interface Type
10/100BASE-T Ethernet, 10 or 100 Mbps; RJ-45 Connector.
Protocols
Audio and status-UDP, RS-232- TCP.
Audio Vocoder
Selectable, 13, 16, 24, 32, or 64 Kbps data rate.
General/Environmental
Programming/Configuration
Web, Telnet, or RS-232 Interface.
Front Panel
Power, Link Active, Channel Active, and Audio Level LEDs.
Rear Panel
Audio/Data (DB15 Female), Serial, Network, and Power Connectors.
Input Power (12 VDC Nom)
+11 to +15 VDC @ 0.5A max. Wall cube supplied operates on 100-240 VAC.
Power Connector
Coaxial Jack, 2.5 mm ID, 5 to 5.5 mm OD; Center Pin Positive; Reverse
Polarity Protected.
Size and Weight
1.4” H x 8”W x 6.8”D (3.55 x 20.3 x 17.3 cm). 1.1 lbs. (0.5kg).
Temperature
Operating: -20 to +60 degrees C. Storage: -40 to +85 degrees C.
Humidity
Up to 95% @ 55 degrees C.
Regulatory Compliance
FCC part 15
Emissions
CE/TUV
Emissions, Immunity and Safety for Europe, USA, Canada