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JPS Communications NXU-2, Installation And Operation Manual

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NXU-2 Operations Manual 

 

 

1-1 

JPS Communications, Inc.

 

1  General Information 

1.1  Scope 

This instruction manual provides the information necessary to install and operate the NXU-2 
Network Extension Unit. 

1.2  Description 

1.2.1  NXU General 

NXU stands for 

N

etwork E

x

tension 

U

nit.  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.  Voice over Internet Protocol, known as 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-2 Description 

The NXU-2 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-2s can form a simple system that creates a transparent 
communications link between the two. The NXU-2 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-2 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-2 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-2’s  serial port, but 

Summary of Contents for NXU-2

Page 1: ...ommunications Inc Installation and Operation Manual NXU 2 Network Extension Unit Designed and Manufactured by JPS Communications Inc 5800 Departure Drive Raleigh NC 27616 Email jps jps com JPS P N 5000 600200 Revision 3 0 April 2002 ...

Page 2: ... equipment at its option upon return of the equipment shipping prepaid to the JPS facility in Raleigh North Carolina USA This warranty does not apply to damage caused by accidents abuse or improper installation NO OTHER WARRANTY EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL APPLY NOTICE JPS Communications Inc ...

Page 3: ...ers 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 8 2 8 5 1 Connecting Equipment and Computers to an NXU 2 2 9 3 CONFIGURATION 3 1 3 1 GENERAL 3 1 3 2 CONFIGURATION DETAILS 3 1 3 3 SERIAL PORT CONFIGURATION 3 1 3 3 1 Entering the Configuration Mode 3 2 3 3 1 1 Hyper Terminal Setup and Use 3 2 3 ...

Page 4: ...4 3 REAR PANEL CONNECTORS ADJUSTMENTS AND LEVEL POTENTIOMETERS 4 1 4 4 NXU 2 OPERATION 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 ...

Page 5: ...3 FIGURE 3 3 CONNECTION DESCRIPTION SCREEN 3 3 FIGURE 3 4 HYPER TERMINAL CONNECT TO SCREEN 3 4 FIGURE 3 5 COM 1 PROPERTIES SCREEN 3 5 FIGURE 3 6 NXU 2 SETUP SCREEN 3 6 FIGURE 3 7 NXU 2 SETUP SCREEN PROPERLY SET 3 7 FIGURE 3 8 NETWORK CONFIGURATION SCREEN 3 13 FIGURE 4 1 NXU 2 CONNECTION MANAGEMENT SCREEN 4 4 List of Tables TABLE 1 1 SPECIFICATIONS 1 4 TABLE 1 2 EQUIPMENT AND ACCESSORIES SUPPLIED 1...

Page 6: ...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 Cont...

Page 7: ...s 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 2 Description The NXU 2 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 dupl...

Page 8: ... Details The NXU 2 is a 10BASE T Ethernet device and each unit has a unique Ethernet address and an RJ 45 physical interface jack A 10BASE T device operates at 10 Mbps and interconnects to a hub star topology using standard CAT 5 twisted pair cable also known as UTP The maximum cable length between an NXU 2 and its hub port is 100 meters With the right connective equipment recommended or supplied ...

Page 9: ...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 2 ...

Page 10: ...ircuit 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 10BASE T Ethernet 10Mbps 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 Programm...

Page 11: ...Assembly 5000 603000 5000 600000 1 DC Power Supply 120 VAC to 12 VDC 500 mA Wall Cube 1620 120130 1 Operation Maintenance Manual 5000 600200 1 Accessory Kit 5000 600150 Consisting of Qty Part Number Description 1 0313 070000 Network Cable 6 ft 1 0313 080000 RS 232 Serial Cable 6 ft 1 0360 015100 Connector cable type D 15 plug 2 0827 000004 Cable clamp for D15 connector 1 7 Optional Equipment Not S...

Page 12: ...NXU 2 Operations Manual 1 6 JPS Communications Inc This Page Left Intentionally Blank ...

Page 13: ...Number Equipment Model and Serial Numbers Shipping Agency Date s of Shipment The JPS Customer Service Department can be reached by phone at 919 790 1011 by fax at 919 790 1456 Upon receipt of this information JPS will arrange for repair or replacement of the equipment 2 3 Reshipment of Equipment If it is necessary to return the equipment to the manufacturer a Returned Material Authorization RMA nu...

Page 14: ... 2 These steps are 1 Determine the IP address subnet mask and if applicable the gateway address for the unit You may have to contact the network administrator for your organization to obtain this information Note Operation of the NXU 2 is not possible without this information 2 Provide the proper primary power for the unit In most cases this requirement will be met by the AC adapter that is includ...

Page 15: ...ted to keep the cabinet interior temperature rise to a minimum NOTE If the NXU 2 is installed in a high RF environment such as repeater system or other transmitter site it is recommended that all cable assemblies be individually shielded with the shield grounded to the ground pin on the terminal block for that module For all D subminiature connector cable assemblies cable shields should be connect...

Page 16: ...NXU 2 Operations Manual 2 4 JPS Communications Inc Figure 2 1 Outline Dimensions ...

Page 17: ...NXU 2 Operations Manual 2 5 JPS Communications Inc Figure 2 2 Control and Connector Locations ...

Page 18: ...remove the top cover as the NXU 2 has no internal user serviceable configuration controls Four position dipswitch S2 should remain S2 1 2 3 all OFF and S2 4 ON unless otherwise instructed by JPS Customer Service There should be no jumper plugs installed on any of the various jumper fields Board to board connections should remain as depicted for proper operation Figure 2 3 NXU 2 Internal View ...

Page 19: ...iated equipment be connected to an AC power source that utilizes an uninterruptible power system UPS If the overall site does not have UPS capability the NXU 2 should be plugged into a smaller UPS such as those used for personal computer systems 2 7 Installation Checklist Table 2 1 Basic Installation Checklist Determine NXU 2 network parameters such as IP address subnet mask and gateway address Yo...

Page 20: ...alanced audio input 7 Analog Ground Analog ground 8 Audio Output Unbalanced Audio output 9 Not used 10 AUX In 1 Auxiliary Input 1 Active low general purpose 11 AUX Out 1 Auxiliary Output 1 Active low general purpose 12 COR Input Input from radio COR programmable active high or low 13 PTT Out Output to radio PTT active low open drain 14 Audio Input Balanced audio input 15 Analog Ground Analog groun...

Page 21: ...vices were modems and equipment The RS 232 standard specified that DTE devices would connect to DCE devices using a straight through cable If you wanted to connect two like devices DTE to DTE or DCE to DCE then you needed a null modem crossover cable The PC is a DTE device and the NXU 2 and ACU 1000 are DCE devices That is why you need a crossover cable for connecting an ACU 1000 to an NXU 2 The f...

Page 22: ......

Page 23: ...ss via telnet or with a web browser Each method of configuration is discussed below NOTE The NXU 2 comes from the factory configured as a server with the following default settings IP Address 192 168 1 200 Subnet Mask 255 255 255 0 Gateway IP 0 0 0 0 If the above network parameters are compatible with your network then you may attach the NXU 2 to your network and use your web browser or telnet cli...

Page 24: ...Setup and Use Hyper Terminal must first be setup to run off the computer serial port The following setup information should allow Hyper Terminal to be set to communicate with the NXU 2 via the RS 232 serial port Hyper Terminal comes with Windows it is located on the Windows Start Bar click PROGRAMS click ACCESSORIES click COMMUNICATIONS click HYPER TERMINAL the Hyper Terminal Window appears then d...

Page 25: ...e a new icon in the Windows Hyper Terminal Window See Figure 3 2 Hypertrm EXE Screen The name you enter here will appear as an icon when complete with this installation allowing you to double click this icon to open the NXU 2 programming screen to use Hyper Terminal Please enter a name which allows you to understand its purpose such as NXU 2 SETUP SCREEN Then click OK Figure 3 3 Connection Descrip...

Page 26: ...e CONNECT USING arrow and select Direct To Com 1 This setting is for the Com Port you will be using to program the NXU 2 If you are using Com 2 please click Direct To Com 2 Click OK Figure 3 4 Hyper Terminal Connect To Screen The Com 1 Properties Screen will appear see Figure 3 5 Com 1 Properties Screen This screen should be set to the parameters as displayed in Figure 3 5 Com 1 Properties Screen ...

Page 27: ...up Screen Click FILE click EXIT The screen will prompt you YOU ARE CURRENTLY CONNECTED ARE YOU SURE YOU WANT TO DISCONNECT NOW Click YES You will then see a screen which asks DO YOU WANT TO SAVE SESSION NXU 2 SETUP SCREEN Click YES You must close the Hyper Terminal Screen before it will save the changes you have made for connecting to the NXU 2 ...

Page 28: ...f the screen Hyper Terminal has a glitch in its programming the information along the bottom should say CONNECTED TIME STAMP AUTO DETECT 9600 8 none 1 If it shows AUTO DETECT AUTO DETECT as above this is incorrect To correct this click FILE click PROPERTIES click CONFIGURE set the Figure 3 5 Com 1 Properties Screen as shown 9600 8 NONE 1 NONE Click OK Click OK Click FILE Click SAVE this saves the ...

Page 29: ...with OK At this point you are in Command Mode and you will be able to issue configuration commands to the NXU 2 NOTE If ever putting the three plus signs into Hyper Terminal and they appear on the screen the NXU 2 is already in the COMMAND Mode Configuration Mode Command Set Type HELP and press the ENTER key The NXU 2 should respond with NXU 2 Commands BAUD CONMODE CONN COR CORINH DATA DISC ECHO G...

Page 30: ...er 1 mode CONN IP address Connect this client to a server at IP address COR 0 1 2 Sets COR active low 0 high 1 or VOX 2 CORINH time Set COR inhibit time to 0 500 1000 2000 3000 or 4000 mS DATA 7 8 Set the serial port data bits DISC Break this client s current connection ECHO ON OFF Enables disables character echo to console GATEIP ip address Set gateway IP address for this unit HANGTM time Set VOX...

Page 31: ...leave the gateway address set at the default address 0 0 0 0 3 3 5 Using DHCP to Assign IP Parameters If you have a DHCP server on your network you may configure the NXU 2 to obtain its IP address subnet mask and gateway address via DHCP Setting the NXU 2 IP address to 0 0 0 0 will cause it to attempt to contact a DHCP server on power up NOTE Using DHCP is not recommended for NXU 2 Server units si...

Page 32: ...COR line then the COR line must either be tied to its active state in which case audio will be sent across the network continuously or you must select VOX mode In any case the COR or VOX mode must be set properly since the NXU 2 uses this setting to determine when to send audio data across the network 3 3 9 VOX Hang Time When VOX mode is enabled you may also adjust the VOX hang time This is the am...

Page 33: ...0 38400 57600 and 115200 The number of data bits may be programmed to 7 or 8 using the DATA command while the number of stop bits may be programmed to 1 or 2 using the STOP command The serial port parity may be programmed to odd even or none by typing the PARITY command followed by O E or N 3 3 12 Voice Compression Settings In order to send voice information over an IP network efficiently the NXU ...

Page 34: ... remote access Additionally a password may be assigned to limit access via a web browser Refer to the chapter on Security for detailed information on setting the NXU 2 security parameters 3 3 14 Store Setup Changes with SAVE Command After any configuration changes have been made SAVE must be typed in order to store the new settings in memory The NXU 2 will automatically restart after changes have ...

Page 35: ...and connecting the single ended input to the remaining half The use of balanced inputs and shielded cables is recommended for superior immunity to noise The audio input will accept signal levels from 30 to 11 dBm Internal circuitry is used to amplify or attenuate this input as necessary to optimize the level to the DSP The signal level is adjusted by the IN LVL potentiometer accessible from the re...

Page 36: ...ernally through a 47K ohm resistor In the active high configuration the input is pulled down to ground through a 22K ohm resistor The logic threshold is 2 5V DC nominal and the input is protected from momentary surges up to 100 V DC 3 5 5 AUX Inputs The AUX inputs AUX IN0 and AUX IN1 are high impedance inputs and are always active low They are pulled up to 5V DC internally through a 47K ohm resist...

Page 37: ...2 does not have an active VoIP connection or the connection has been lost 4 2 3 Channel Active LED This green LED is lit whenever COR is active This also indicates that the NXU 2 is sending audio data across the IP link 4 2 4 Audio Input LED This yellow LED is provided as a visual aid in setting the proper input audio level for optimal operation See Section 4 4 2 Input Output Level Adjustments for...

Page 38: ...4 4 3 COR Input Description The COR input on J7 controls the flow of data across the network When COR is not active the units will send a keep alive packet every 4 seconds just to keep the connection from timing out If a unit has an active COR input that unit s audio input will be transferred across the network and will appear at the audio output on J7 at the other unit As long as the COR input of...

Page 39: ...he connection state of the NXU 2 client This can be done via the serial port by entering command mode as described in Section 3 3 1 Entering the Configuration Mode or via the network using Telnet or a Web Browser 4 5 1 Serial or Telnet Control When using the serial port in command mode or Telnet the user may disconnect a client from a server by typing DISC A connection may be made to a server by t...

Page 40: ...r Control The NXU 2 client connection may be managed by browsing to the NXU 2 client IP address and selecting the Connection Management menu option The user may then issue connect or disconnect commands via the web browser Figure 4 1 NXU 2 Connection Management Screen ...

Page 41: ...or example setting the security level to 136 128 8 disables both telnet and HTTP access Setting security to 96 64 32 allows the connection status to be monitored by HTTP but no configuration or connection changes may be made via HTTP Setting security to 24 8 16 disables telnet access and requires the user to enter a password for HTTP access Note The default security setting from the factory is SEC...

Page 42: ...g dialog In order to access the NXU 2 you must enter the password that was previously programmed using the PASS command The User Name is not required you may enter anything or nothing in this field but the password must be entered correctly in order to access the unit Once you have entered the password you will not need to enter it again unless you exit your web browser Note The security level and...

Page 43: ...trol either hardware or software is being used in your terminal program Make sure you wait at least 5 seconds and then type three plus signs within 1 second Settings made in Command Mode do not appear to take effect You must issue a SAVE command after making changes in order to save the new settings and restart the NXU 2 Client and Server units are properly configured and online but LINK ACTIVE is...

Page 44: ...adio squelch is set properly Audio has pauses and or gaps in it Check for low bandwidth or excessive latency on the network by running a trace route from a network connected PC to the NXU 2 at the other end of the link Cannot browse to the NXU 2 s IP address Check the NXU 2 SECURITY setting this activity may not be allowed See section 4 6 Security for security settings Cannot Telnet to the NXU 2 s...

Page 45: ...NXU 2 s network connection is via Ethernet Most dialup telephone line modems only provide RS 232 connections but even if an Ethernet connection to a dialup is available the NXU 2 may not operate properly since the connection speed is not guaranteed on a dialup connection Poor telephone lines or varying line conditions may cause a dialup modem to reduce its connection speed without the user being a...

Page 46: ...ngle client server pair Only one Client can be connected to a Server at any given time I have a 100 Mbps Ethernet Can I connect the 10 Mbps port on the NXU 2 to my network Most 100Mbps equipment hubs switches routers will work with either 10Mbps or 100Mbps connection so it should work without any problems Check with your network administrator if you re unsure about your network equipment capabilit...

Page 47: ... enough to go around There are only about 4 billion IP addresses available On the surface that would appear to be enough but some companies use a lot of them the military uses a lot of them and all the millions and millions of people using the Internet use a lot of them To ease this problem many Internet providers only assign an IP address to a computer when someone actually dials in to connect to...

Page 48: ...ol Protocol and UDP User Datagram Protocol With both methods the NXU 2 uses IP port 1221 to communicate If a firewall is preventing the NXU 2 connection then the network administrator must program the firewall to allow TCP and UDP traffic on port 1221 This is often referred to as opening a hole in the firewall and should only be done with the cooperation of the network administrator After installi...

Page 49: ...nput If instead of connecting to both balanced input lines you connect your audio to one audio input and ground you ll get the effect described above There is enough leakage in the transformer to get some audio through but it won t work properly I ve connected my radio to the NXU 2 and it works but the audio sounds very tinny and doesn t have much bass Make sure you haven t used the discriminator ...

Page 50: ...d I still can t get the OK prompt telling me that the NXU 2 is in Command Mode Now what If the NXU 2 has been configured previously and the baud rate was changed to something other than the factory default of 9600 then you ll need to set your terminal program to use the new baud rate in order to enter the Command Mode ...

Page 51: ... 2 shares a common area of memory with the unit s DSP processor allowing data to be exchanged between the two processors quickly and easily When the network processor sees the unit s COR input line go active it collects the frames of compressed digital audio from the DSP and packages them into packets for transmission across the network These audio packets are sent to the NXU 2 at the other end of...

Page 52: ...NXU 2 Operations Manual 7 2 JPS Communications Inc This Page Left Intentionally Blank ...

Page 53: ...cessories Supplied 1 5 F firewall 6 1 Front Panel 2 7 4 1 G General Information 1 1 Glossary 6 H Hyper Terminal Setup and Use 3 2 I I O DESCRIPTIONS 3 13 Installation 2 1 Installation Checklist 2 7 Installation Considerations 2 3 Internal Configuration 2 6 O Operation 4 1 Optional Equipment Not Supplied 1 5 Outline Dimensions 2 4 P Port 3 9 6 1 Power Requirements 2 7 PTT Output 3 14 R Reshipment o...

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