JPS NXU-2B User manual

Interoperability Now!
INTEROPERABILITY NOW
Installation and Operation Manual
NXU-2B
Network Extension Unit
JPS Interoperability Solutions
5800 Departure Drive
Raleigh, NC 27616
919-790-1011
Email: [e-mail] / [e-mail]
www.jpsinterop.com
JPS P/N 5190-200200 Revision 1.5 August 2020

NXU-2B Operations Manual
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NOTICE
© 2020 JPS Interoperability Solutions. NXU and NXU-2B are trademarks of
JPS Interoperability Solutions, Inc.
JPS Interoperability Solutions reserves the right to make changes to the
equipment and specifications without prior notice.
CAUTION
Changes and modifications to this equipment not expressly approved by JPS
Interoperability Solutions could impair proper operation of the equipment and/or
could void user’s warranty.
JPS Interoperability Solutions
[phone]
[email protected]
supp[email protected]om
5800 Departure Drive
Raleigh, NC 27616

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iii Interoperability Now!
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 Advantages of NXU Technology ........................................................................................1-2
1.3 NETWORK DETAILS ................................................................................................................1-2
1.4 SPECIFICATIONS......................................................................................................................1-3
1.5 EQUIPMENT AND ACCESSORIES SUPPLIED.............................................................................1-4
1.6 OPTIONAL EQUIPMENT -NOT SUPPLIED ................................................................................1-4
1.7 DIFFERENCES BETWEEN THE NXU-2B AND THE NXU-2A....................................................1-5
1.8 NXU-2B OVERVIEW...............................................................................................................1-6
1.8.1 Important definitions:.........................................................................................................1-6
1.8.2 Configuration.....................................................................................................................1-7
1.8.3 Basic Applications and Operation.....................................................................................1-7
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 Jumper Configuration..........................................................................................2-4
2.5.2 E&M Return Selection .......................................................................................................2-5
2.6 POWER REQUIREMENTS..........................................................................................................2-5
2.7 INSTALLATION CHECKLIST.....................................................................................................2-5
2.8 REAR PANEL CONNECTORS....................................................................................................2-6
2.8.1 DC Input Connector, (+12 VDC INPUT)..........................................................................2-6
2.8.2 Connection to Radio or Other Four-Wire Device (AUDIO/CONTROL) ..........................2-6
2.8.3 Network Connection...........................................................................................................2-8
2.8.4 Serial Port Connection, (RS-232)......................................................................................2-8
3CONFIGURATION .......................................................................................................................3-1
3.1 GENERAL ................................................................................................................................3-1
3.2 CONFIGURATION DETAILS......................................................................................................3-1
3.3 CONFIGURATION VIA WEB BROWSER ....................................................................................3-2
3.3.1 Name ..................................................................................................................................3-2
3.3.2 IP Address and Subnet Mask..............................................................................................3-3
3.3.3 Gateway IP Address...........................................................................................................3-3
3.3.4 Unit is a (Client or Server).................................................................................................3-3
3.3.5 Remote IP and Remote Port (applicable only to Client units)...........................................3-3
3.3.6 VoIP Port ...........................................................................................................................3-3
3.3.7 Command Port...................................................................................................................3-4
3.3.8 Communications Mode.......................................................................................................3-4
3.3.9 Voice Compression.............................................................................................................3-5
3.3.10 VoIP QOS DSCP Value .....................................................................................................3-5
3.3.11 Serial Port Settings ............................................................................................................3-5
3.3.12 COR Sense (COR/VOX/VMR)............................................................................................3-5
3.3.13 VOX/VMR Sensitivity.........................................................................................................3-6

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3.3.14 VOX/VMR Hangtime......................................................................................................... 3-6
3.3.15 RX Input Level................................................................................................................... 3-6
3.3.16 RX Boost Mode.................................................................................................................. 3-6
3.3.17 RX Delay ........................................................................................................................... 3-7
3.3.18 TX Output Level ................................................................................................................ 3-7
3.3.19 TX Delay............................................................................................................................ 3-7
3.3.20 Duplex............................................................................................................................... 3-7
3.3.21 COR Priority..................................................................................................................... 3-7
3.3.22 COR Inhibit Time.............................................................................................................. 3-7
3.3.23 NXU-2B Dispatch Option ................................................................................................. 3-8
3.4 CONFIGURATION VIA SERIAL PORT....................................................................................... 3-9
3.4.1 Configuration Using an RS-232 Terminal Program......................................................... 3-9
3.4.2 Configuration Mode Command Set................................................................................... 3-9
3.4.3 Command Summary........................................................................................................ 3-10
3.4.4 Setting Unit IP Address................................................................................................... 3-12
3.4.5 Setting Unit Subnet Mask and Gateway Address............................................................ 3-12
3.4.6 Using DHCP to Assign IP Parameters........................................................................... 3-12
3.4.7 Setting VoIP Port (Optional) .......................................................................................... 3-12
3.4.8 Client/Server Selection.................................................................................................... 3-12
3.4.9 Serial Port Settings ......................................................................................................... 3-13
3.4.10 COR and VOX Settings ................................................................................................... 3-13
3.4.11 Duplex Setting................................................................................................................. 3-13
3.4.12 VOX Hang Time.............................................................................................................. 3-14
3.4.13 COR Inhibit Time............................................................................................................ 3-14
3.4.14 Voice Compression Settings............................................................................................ 3-14
3.4.15 Security Settings.............................................................................................................. 3-15
3.4.16 Ethernet MAC Address.................................................................................................... 3-15
3.4.17 Command Port ................................................................................................................ 3-15
3.4.18 RX Input Level................................................................................................................. 3-15
3.4.19 TX Output Level .............................................................................................................. 3-15
3.4.20 Input Level Boost +20db................................................................................................. 3-16
3.4.21 TX Delay.......................................................................................................................... 3-16
3.4.22 RX Delay ......................................................................................................................... 3-16
3.4.23 VMR................................................................................................................................. 3-16
3.4.24 VOX and VMR Sensitivity Adjustments........................................................................... 3-16
3.4.25 Restoring Factory Defaults............................................................................................. 3-16
3.5 COMMUNICATIONS MODE ................................................................................................... 3-17
3.5.1 Store Setup Changes with SAVE Command.................................................................... 3-18
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 ................................................................................................... 4-1
4.4 NXU-2B OPERATION............................................................................................................. 4-1
4.4.1 Operation at Power-Up..................................................................................................... 4-2
4.4.2 Input/Output Audio Level Adjustments ............................................................................. 4-2
4.4.3 COR Input Description ..................................................................................................... 4-2

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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 Web Browser Control.........................................................................................................4-3
4.5.2 Serial or Telnet Connection Control..................................................................................4-4
5SECURITY......................................................................................................................................5-1
5.1.1 Password Setting................................................................................................................5-1
6NXU-2B FIELD OPTIMIZATION GUIDE ................................................................................6-1
6.1 RADIO INTERFACE USING JPS CUSTOM RADIO CABLES........................................................6-1
6.1.1 RX Audio Input Level.........................................................................................................6-2
6.1.2 TX Audio Output Level.......................................................................................................6-2
6.1.3 VOX/VMR Sensitivity.........................................................................................................6-2
6.1.4 TX Audio Delay..................................................................................................................6-2
6.1.5 RX Audio Delay..................................................................................................................6-3
6.2 RADIO INTERFACE USING CUSTOMER-DESIGNED RADIO CABLES........................................6-3
6.3 RADIO INTERFACE TROUBLESHOOTING TIPS .........................................................................6-4
6.3.1 Symptom: User in Field Complains of Missed First Syllables ..........................................6-4
6.3.2 Symptom: User in Field Complains of Missed Syllables Mid-Conversation.....................6-4
6.3.3 Symptom: User in Field Complains of Dropped Audio.....................................................6-4
6.3.4 Symptom: Continuous Ping-Pong between Cross Connected Radios ...............................6-4
6.3.5 Symptom: False Keying of Donor Radio by Radio Channel .............................................6-5
6.3.6 Symptom: Radio Channel Experiencing Continuous Active COR State............................6-5
6.3.7 Symptom: Audio Sounds Too Weak....................................................................................6-5
6.3.8 Symptom: Audio Sounds Too Loud or Distorted................................................................6-5
6.4 TROUBLESHOOTING TABLE....................................................................................................6-6
7NXU-2B FIRMWARE UPDATE..................................................................................................7-1
7.1 NXU-2B FIRMWARE UPDATE PROCEDURE............................................................................7-1
8NXU-2B FAQ (FREQUENTLY ASKED QUESTIONS)............................................................8-1
8.1 GENERAL ................................................................................................................................8-1
9INDEX .............................................................................................................................................9-1

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List of Figures
FIGURE 1-1 NXU-2B BASIC BLOCK DIAGRAM...................................................................................... 1-2
FIGURE 1-2 TWO NXU-2BS ENABLING A RADIO REPEATER FUNCTION............................................... 1-7
FIGURE 1-3 NXU-2B PAIR CREATES REMOTE DISPATCH CAPABILITY USING AN LE DEVICE............. 1-8
FIGURE 1-4 NXU-2BS CONNECT RADIO CHANNELS TO AN ACU-Z1 INTEROP SYSTEM ...................... 1-8
FIGURE 1-5 SINGLE NXU-2B CONNECTS A RADIO CHANNEL TO A JPS VIA PTTOCCHANNEL........... 1-9
FIGURE 2-1 FRONT AND REAR VIEWS.................................................................................................... 2-3
FIGURE 2-2 NXU-2B INTERNAL CONFIGURATION JUMPERS................................................................. 2-4
FIGURE 2-3 DTE VERSUS DCE SERIAL CABLES.................................................................................... 2-9
FIGURE 3-1 NXU-2B CONFIGURATION PAGE......................................................................................... 3-2
FIGURE 4-1 NXU-2B CONNECTION MANAGEMENT SCREEN................................................................. 4-3
FIGURE 5-1 WEB ACCESS WITH PASSWORD PROTECTION .................................................................... 5-1
FIGURE 5-2 NETWORK PASSWORD DIALOG.......................................................................................... 5-2
FIGURE 7-1 FIRMWARE UPLOAD............................................................................................................ 7-1
List of Tables
TABLE 1-1 SPECIFICATIONS............................................................................................................ 1-3
TABLE 1-2 EQUIPMENT AND ACCESSORIES SUPPLIED.................................................................... 1-4
TABLE 1-3 OPTIONAL EQUIPMENT -NOT SUPPLIED....................................................................... 1-4
TABLE 2-1 NXU-2B JUMPER SETTINGS [DEFAULT SETTINGS IN BOLD TEXT].............................. 2-4
TABLE 2-2 BASIC INSTALLATION CHECKLIST ................................................................................ 2-5
TABLE 2-3 NXU-2B PINOUT (AUDIO/CONTROL PORT) ................................................................. 2-6
TABLE 2-4 J4 SERIAL PORT PINOUT ............................................................................................... 2-8
TABLE 5-1 TROUBLESHOOTING TIPS .............................................................................................. 6-6

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vii 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 control signal to a radio transmitter that 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.

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Interoperability Now!
1General Information
1.1 Scope
This instruction manual provides the information necessary to install and operate the NXU-2B
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.
The NXU-2B is standards-compliant and therefore supports standards-compliant web browsers,
including Microsoft Edge, Firefox, Chrome, Opera, and Safari. It’s always best to use the most
current version of any web browser.
The NXU-2B is intended for use with radio communications consoles, communications radios,
and JPS products such as the ACU-1000 Interconnect Unit. This 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-2Bs can form a simple system that creates a transparent communications
link between the two. The NXU-2B 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-2B 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-2B 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. Configuration is done through the NXU-2B’s Ethernet port using a standard
web browser.
Designed for years of continuous operation in mission-critical applications and remote locations,
the NXU-2B has no moving parts and requires no periodic shutdown or maintenance. Startup
upon power on is under 10 seconds.

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1.2.2 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.
1.3 Network Details
The NXU-2B 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-2B and its hub port is 100 meters.
With the right connective equipment (recommended or supplied by JPS), the NXU-2B’s Ethernet
port can be linked with virtually any LAN, WAN, or the Internet, no matter which topology or
cabling system is in use.
Figure 1-1 NXU-2B Basic Block Diagram
Audio In
Audio Out
RS-232
COR
PTT
AUX In
AUX Out
Ethernet
NXU-2