JPS Communications NXU-2 Installation And Operation Manual
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JPS Communications NXU-2 Installation And Operation Manual

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NXU-2 Operations Manual
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
1
JPS Communications, Inc.

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Summary of Contents for JPS Communications NXU-2

  • Page 1 NXU-2 Operations Manual 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 JPS Communications, Inc.
  • Page 2 NXU-2 Operations Manual Warranty JPS Communications, Inc. warrants its manufactured equipment to be free from defects in materials and workmanship, and to conform to published specifications for a period of 18 months from the date of shipment from the factory or 12 months from installation, whichever occurs first.

  • Page 3: Table Of Contents

    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..........................2-8 2.8.5.1 Connecting Equipment and Computers to an NXU-2...................2-9 CONFIGURATION ..............................3-1 ................................3-1 ENERAL ...........................3-1 ONFIGURATION ETAILS ..........................3-1...
  • Page 4 ONTROLLING ONNECTIONS 4.5.1 Serial or Telnet Control..........................4-3 4.5.2 Web Browser Control............................4-4 ................................4-5 ECURITY 4.6.1 Password Setting............................4-5 4.6.2 Web Access with Password Protection.......................4-6 NXU-2 TROUBLESHOOTING..........................5-1 NXU-2 FAQ (FREQUENTLY ASKED QUESTIONS)..................6-1 ................................6-1 ENERAL THEORY OF OPERATION ............................7-1 INDEX ....................................8-1 JPS Communications, Inc.

  • Page 5: List Of Tables

    NXU-2 Operations Manual List of Figures NXU-2 B ........................1-2 IGURE ASIC LOCK IAGRAM NXU-2 R ........................1-3 IGURE IMPLE ADIO YSTEM .............................2-4 IGURE UTLINE IMENSIONS ......................2-5 IGURE ONTROL AND ONNECTOR OCATIONS NXU-2 I ..........................2-6 IGURE NTERNAL DTE V DCE S ......................2-9...
  • Page 6 NXU-2 Operations Manual Glossary Glossary 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).

  • Page 7: General Information

    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.

  • Page 8: Network Details

    Start up upon power on is typically 5 seconds. 1.3 Network 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.

  • Page 9: Applications

    NXU-2 Operations Manual 1.4 Applications See Figure 1-2 Simple NXU-2 Radio System below illustrates a basic NXU-2 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.

  • Page 10: Specifications

    NXU-2 Operations Manual 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. Frequency Response 10 Hz to 3600 Hz +/- 2dB.

  • Page 11: Equipment And Accessories Supplied

    0360-015100 Connector, cable type, D-15 plug 0827-000004 Cable clamp for D15 connector 1.7 Optional Equipment - Not Supplied Table 1-3 Optional Equipment - Not Supplied Item JPS P/N Description At this time, there are no options for the NXU-2 JPS Communications, Inc.
  • Page 12 NXU-2 Operations Manual This Page Left Intentionally Blank. JPS Communications, Inc.

  • Page 13: Installation

    NXU-2 Operations Manual 2 Installation 2.1 General This section provides the instructions for unpacking, inspection, installation and set-up. Also included are directions for reshipment of damaged parts or equipment. 2.2 Unpacking and Inspection After unpacking the unit, retain the carton and packing materials until the contents have been inspected and checked against the packing list.

  • Page 14: Installation Overview

    2. Provide the proper primary power for the unit. In most cases, this requirement will be met by the AC adapter that is included with the NXU-2. 3. Interconnect the unit with the communications system via the NXU-2's rear panel connectors. J7 provides the audio and control lines necessary to interface the NXU- 2 to your audio equipment.

  • Page 15: Installation Considerations

    Figure 2-1 Outline Dimensions provides overall unit dimensions. The NXU-2 must be installed in a structure that provides both protection from the weather and assurance of ambient temperatures between -10 and +55 degrees C. Since the unit is neither splash proof nor corrosion resistant, it must be protected from exposure to salt spray.

  • Page 16: Figure 2-1 Outline Dimensions

    NXU-2 Operations Manual Figure 2-1 Outline Dimensions JPS Communications, Inc.

  • Page 17: Figure 2-2 Control Andc

    NXU-2 Operations Manual Figure 2-2 Control and Connector Locations JPS Communications, Inc.

  • Page 18: Internal Configuration

    NXU-2 Operations Manual 2.5.1 Internal Configuration The illustration below shows the NXU-2 with its top cover and rear panel removed. There is normally no reason to 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.

  • Page 19: Power Requirements

    NXU-2 Operations Manual 2.6 Power Requirements The NXU-2 is designed to operate from a nominal +12V DC supply. The unit will meet all of its specifications over a voltage range of +11 to +15 VDC. The DC power consumption is 500 mA maximum.

  • Page 20: Audio Level Adjustment Potentiometers And Input Test Point

    2.8.3 Connection to Radio or Other Four-Wire Device (J7) The interface between the NXU-2 and associated radio or other audio device is made via J7 (Audio/Control) on the rear panel. J7 is a female DB-15 connector. NXU-2 Pinout (J7)

  • Page 21: Connecting Equipment And Computers To An Nxu-2

    The RS-232 serial cable supplied with the NXU-2 is a straight-through cable used to connect the NXU-2 to a PC serial port. In order to connect the NXU-2 port to an ACU-1000, you need a DB-9 male-male null modem cable, also called a crossover cable.

  • Page 23: Configuration

    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 client to configure the NXU-2 as outlined in Section 3.4, Network Configuration. 3.3 Serial Port Configuration To configure the NXU-2 using the serial port, connect a standard serial cable to J4 on the NXU-2 rear panel.

  • Page 24: Entering The Configuration Mode

    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 double click the HYPERTRM.EXE...

  • Page 25: Figure 3-2 Hypertrm .Exe S

    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.

  • Page 26: Hyper Terminalc

    PC, such as Com 1 or your modem card. Please click the 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...

  • Page 27: Figure 3-5 Com 1 Properties

    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: Figure

    SETUP SCREEN.HT. See Figure 3-2 Hypertrm.EXE Screen. This will open the Figure NXU-2 Setup Screen. Look at the bottom of 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.
  • Page 29 NXU-2 Setup Screen Properly Set Wait at least 10 seconds after power up of the NXU-2 and type +++ (three plus signs) on your keyboard. You must type all 3 ‘+’ characters within 1 second. Do not type anything else – only the 3 ‘+’...

  • Page 30: Command Summary

    SAVE Command. 3.3.2 Command Summary This is a full list of the commands available in the NXU-2 command mode. More detail is given on the following pages. You can get a one-line summary of each command by typing HELP followed by the command.

  • Page 31: Setting Unit Ip Address

    WHAT - Print a description of this unit's settings 3.3.3 Setting Unit IP Address The first thing you should do is to set the IP address of the unit. The NXU-2 comes from the factory with a default IP address set to 192.168.1.200. Set the address by typing: MYIP <IP address>...

  • Page 32: Cor And Vox Settings

    COR, while COR 1 selects active high COR sense. COR 2 selects VOX mode. In VOX mode, no connection to the NXU-2 COR input is required, since the audio input level itself is used to determine when a signal is present. In order to conserve network bandwidth, digital audio packets are only sent when COR is active.

  • Page 33: Serial Port Settings

    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-2 uses digital signal processing algorithms to compress the voice information so that it requires less network bandwidth.

  • Page 34: Security Settings

    LOGOUT may be typed to disconnect the telnet connection manually. A web browser may also be used to browse the IP address of the NXU-2. From the opening page select NXU-2 Configuration. The following page will be seen where configuration changes can be made and saved.

  • Page 35: I/O Descriptions

    3.5.1 Audio Input The NXU-2 audio input is 47K ohm, balanced. It can be used as an unbalanced input by grounding one half of the balanced pair 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.

  • Page 36: Audio Input Test Point

    2.5V DC nominal, and the input is protected from momentary surges up to +100 V DC. 3.5.6 PTT Output The PTT output from the NXU-2 is an open drain type. It can sink up to 100 mA of current, and can withstand open-circuit voltages up to +60V DC. In order to avoid conflicts with internal pull-up resistors on the PTT lines of some radio equipment, there is no internal pull-up resistor on the NXU-2 PTT output.

  • Page 37: Operation

    The green Link Active LED is illuminated whenever the NXU-2 has an IP connection open to another NXU-2 on the network. If this indicator is not lit, either the NXU-2 does not have an active VoIP connection or the connection has been lost.

  • Page 38: Operation At Power-Up

    4.4.2 Input/Output Level Adjustments At this point, the audio input level to the NXU-2 may be set by adjusting the IN LVL control on the rear panel. With normal audio input applied at J7, adjust the IN L VL control until the AUDIO INPUT indicator flashes on voice peaks.

  • Page 39: Auxiliary I/O

    NXU-2 Operations Manual 4.4.5 Auxiliary I/O The NXU-2 has two sets of independent inputs and outputs, which may be used for control of the user’s equipment. AUX IN 0 and AUX IN 1 are active-low inputs which, when activated on one end, will cause AUX OUT 0 and AUX OUT 1 on the other end to become active.

  • Page 40: Web Browser Control

    NXU-2 Operations Manual 4.5.2 Web Browser 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.

  • Page 41: Security 0

    NXU-2. 4.6.1 Password Setting The NXU-2 security level may be set to require a password for HTTP access. The password may be programmed while in the command mode using the PASS command followed by the desired password.

  • Page 42: Web Access With Password Protection

    NXU-2 Operations Manual 4.6.2 Web Access with Password Protection When the NXU-2 security level is set to require a password, any attempt to access the unit via HTTP will result in the web browser displaying the following dialog: In order to access the NXU-2 you must enter the password that was previously programmed using the PASS command.

  • Page 43: Nxu-2 Troubleshooting

    NXU-2. Client and Server units are properly Verify that both the Client and Server NXU-2 configured and online but LINK ACTIVE is units are “visible” on the network by not on.
  • Page 44 Verify that the COR polarity is programmed continuously. properly. See section 3.3.8. If NXU-2 is attached to a radio COR line, make sure the radio squelch is set properly. Audio has pauses and/or gaps in it. Check for low bandwidth or excessive latency...

  • Page 45: Nxu-2 Faq (Frequently Asked Questions)

    Sometimes this causes difficulty when installing network equipment such as the NXU-2. There are two solutions to this problem. You can install the NXU-2 on the outside of the firewall, or you can open a hole in the firewall so that the port specifically used by the NXU-2 is accessible.
  • Page 46 COR permanently will cause data to flow continuously across the link, even if no audio is present. I want to use a number of NXU-2’s but I only have one (or a few) IP addresses from my Internet Provider. What can I do? One solution is to use a Network Address Translating (NAT) Router to connect the NXU-2 units to your network.
  • Page 47 NXU-2 Operations Manual After losing power on one end of an NXU-2 link, it takes a while for the units to re-establish communications. Why is this? The NXU-2 will wait up to 20 seconds before determining that the link has been disconnected.
  • Page 48 The RS-232 serial cable supplied with the NXU-2 is a straight-through cable used to connect the NXU-2 to a PC serial port. In order to connect the NXU-2 port to an ACU-1000 you need a DB-9 male-male null modem cable, also called a crossover cable.
  • Page 49 Pilot tone, keying tones, and other similar signaling tones will work properly. In general the RS-232 port should be used to send data, however. I've connected my radio to the NXU-2, I have the levels turned all the way up and can still barely hear the audio. What's wrong? The NXU-2 uses balanced audio on the input.
  • Page 50 '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: Theory Of Operation

    This operation is outlined below. When power is applied to an NXU-2 it either waits for a connection (if it’s a server) or attempts a connection to a server (if it’s a client). The server it attempts to connect to is the one that has an IP address identical to the SRVRIP address programmed in the client.
  • Page 52 NXU-2 Operations Manual This Page Left Intentionally Blank. JPS Communications, Inc.

  • Page 53: Index

    NXU-2 Operations Manual 8 Index Address ................2-1 I/O DESCRIPTIONS ..........3-13 Adjustments............2-7, 4-1 Installation..............2-1 Applications..............1-3 Installation Checklist...........2-7 Audio Input ..............3-13 Installation Considerations.........2-3 Audio Output ............. 3-14 Internal Configuration..........2-6 AUX Inputs..............3-14 AUX Outputs ............. 3-14 Operation...............4-1 Optional Equipment - Not Supplied ......1-5 Command Mode ............3-7...

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