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JPS QMT-1B Installation And Operation Manual

Ip backhaul remote
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Installation and Operation Manual
QMT-1B
IP Backhaul Remote
For
The SNV-12 Voter
JPS Interoperability Solutions
5800 Departure Drive
Raleigh, NC 27616
919-790-1011
Email:
sales@jpsinterop.com
/
support@jpsinterop.com
www.jpsinterop.com
JPS P/N 5200-300200
Revision 1.0
August 2020

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Summary of Contents for JPS QMT-1B

  • Page 1 Installation and Operation Manual QMT-1B IP Backhaul Remote The SNV-12 Voter JPS Interoperability Solutions 5800 Departure Drive Raleigh, NC 27616 919-790-1011 Email: sales@jpsinterop.com support@jpsinterop.com www.jpsinterop.com JPS P/N 5200-300200 Revision 1.0 August 2020...
  • Page 2 QMT-1B Operations Manual NOTICE © 2020 JPS Interoperability Solutions. SNV-12, QMT-1B, SVM-2 and SVM-3 are all trademarks of JPS Interoperability Solutions, Inc. JPS Interoperability Solutions reserves the right to make changes to the equipment and specifications without prior notice. CAUTION...

  • Page 3: Table Of Contents

    QMT-1B Name: ..........................3-2 3.2.2 IP Address: ............................3-2 3.2.3 Subnet Mask: ............................ 3-2 3.2.4 Gateway:............................3-3 3.2.5 QMT-1B RoIP Port: ......................... 3-3 3.2.6 QMT-1B Sync Port: .......................... 3-3 3.2.7 SVM-3 IP: ............................3-3 3.2.8 SVM-3 RoIP Port: ..........................3-3 3.2.9 SVM-3 Sync Port: ..........................
  • Page 4 OPERATION ..............................4-1 ............................... 4-1 ENERAL ........................4-1 PERATION AT OWER LED ............................4-1 OWER LED..........................4-1 CTIVE LED ......................... 4-1 HANNEL CTIVE LED ..........................4-1 UDIO NPUT QMT-1B TROUBLESHOOTING ........................ 5-1 QMT-1B FAQ (FREQUENTLY ASKED QUESTIONS) ................6-1 ............................... 6-1 ENERAL...
  • Page 5 QMT-1B Operations Manual List of Figures 1-1 SNV-12 V SVM-3 S QMT-1B R ....1-2 IGURE OTING YSTEM WITH OTER ODULES AND EMOTES 1-2 QMT-1B B ......................1-4 IGURE ASIC LOCK IAGRAM 2-1 F & R ....................... 2-3 IGURE RONT...
  • Page 6 QMT-1B 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

    The SNV-12 Voter has long been the leader in analog receiver voting. Prior to the introduction of IP backhaul made possible by the QMT-1B working in concert with the SVM-3 modules, all audio input into the SNV-12 was strictly synchronous, interfaced to SVM-2 modules. The QMT-1B/SVM-3 pair allow voting receiver audio to be transported via non-synchronous IP.

  • Page 8: Figure 1-1 Snv-12 Voting

    Figure 1-1 SNV-12 Voting System with SVM-3 Site Voter Modules and QMT-1B Remotes QMT-1B remotes reside at the receiver site, one QMT-1B per receiver. By being placed at the receiver, the QMT-1B can accurately measure the Signal Quality before the audio is encoded into RoIP.

  • Page 9: System Requirements

    The network that the SVM-3/QMT pair is used on must to meet the following specifications: • 100 Kbits/per second throughput per QMT-1B audio channel in each direction. 200 Kbps for a duplex channel.

  • Page 10: The Qmt-1B Radio Interface

    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 a QMT-1B and its hub port is 100 meters. The QMT-1B’s Ethernet port can be linked with virtually any LAN, WAN, or the Internet, no matter which topology or cabling system is in use.

  • Page 11: Specifications

    QMT-1B Operations Manual 1.7 Specifications Table 1-1 Specifications RX Audio Input Input impedance 600 ohms balanced transformer coupled, 47k ohms selectable. Incoming signals adjustable from –26 to +10 dBm to set -10 dBm nominal Input Level input; +15 dBm clipping.

  • Page 12: Equipment And Accessories Supplied

    (open drain transistor) keying output. There is a jumper selectable solid-state output available on the QMT-1B as well, but the default is to use the relay for PTT. The relay allows for higher keying voltages and currents than the solid-state output.

  • Page 13: Installation

    Authorization (RMA) number must first be obtained from JPS, following the process detailed on the JPS website. This number must be noted on the outside of the packing carton and on all accompanying documents. When packing the unit for reshipment, it is best to use the original packaging for the unit;...

  • Page 14: Installation Overview

    2. Provide the proper primary power for the unit. 3. Interconnect the unit with the communications system via the QMT-1B's rear panel connectors. J6 provides the audio and control lines necessary to interface the QMT- 1B to your voting receiver and any system transmitter. J4 uses a standard RJ-45 Ethernet Patch Cable (non-crossover) to connect to the network.

  • Page 15: Installation Considerations

    Careful attention to the following installation suggestions should result in the best unit/system performance. The QMT-1B must be installed in a structure that provides both protection from the weather and assurance of ambient temperatures between -30 and +60 degrees C. When the unit is mounted in a cabinet with other heat-generating equipment, the use of a rack blower is suggested to keep the cabinet interior temperature rise to a minimum.

  • Page 16: Power Requirements

    QMT-1B Operations Manual 2.5.1 Power Requirements The QMT-1B 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 and will be damaged by a DC source that delivers a constant (non-transient) DC voltage above this range.
  • Page 17 –26 to +10 dBm. 2.7.3.3 COR Input The COR input to the QMT-1B is a high impedance input and can be programmed to be active high or active low. In the active low configuration, the input is pulled up to +5V DC internally...

  • Page 18: Network Connection

    +100 V DC. 2.7.3.4 PTT Output The PTT output from the QMT-1B is an E&M relay type that grounds the PTT output when active. The PTT output can also be configured to be an open drain type which can sink up to 100 mA of current and can withstand open-circuit voltages up to +60V DC.

  • Page 19: Internal Jumper Configuration

    QMT-1B Operations Manual 2.7.6 Internal Jumper Configuration The illustration below shows the QMT-1B internal PCB jumper locations. The only reason to open the unit is if these default settings are not optimal for your system. For the majority of applications, the default jumper settings are sufficient and need not be changed.
  • Page 20 QMT-1B Operations Manual End of Section 2...

  • Page 21: Configuration

    On the QMT-1B Information page there is a button that enables/disables a 1000 Hz Test Tone. If the QMT-1B is connected to an SVM-3 (RoIP Link Up), then pressing “Start” will cause the QMT-1B to begin sending RoIP packets to the SVM-3 that contain a 1000 Hz Test Tone. The tone level is set to correspond with what a properly adjusted input level to the QMT-1B should be.

  • Page 22: Qmt-1B Configuration Selections

    This entry allows the operator to give the QMT-1B a unique name (optional). 3.2.2 IP Address: This is the IP Address assigned to the QMT-1B. Setting this address to 0.0.0.0 will cause the QMT-1B to attempt to use DHCP to automatically obtain an IP address. Whenever this address is changed the QMT-1B will reboot.

  • Page 23: Gateway

    QMT-1B Operations Manual 3.2.4 Gateway: This is usually the address of the router the QMT-1B is connected to. The Gateway is the IP address the QMT-1B will go to whenever it attempts to send a packet out of its own Subnet.

  • Page 24: Cor Inhibit

    If the remote site has a voting receiver only, set to Half Duplex. If there is also a transmitter at the site that will use TX audio and PTT Active from the SNV-12 via the QMT-1B, set to Full Duplex.

  • Page 25: Store Setup Changes With Save Command

    3.2.18 Store Setup Changes with SAVE Command If any configuration changes have been made, click on the “SAVE CHANGES” button to store these new settings in memory. Depending on the changes made, the QMT-1B may automatically restart. 3.3 QMT-1B Activity Log The Activity Log page displays various events along with the time they occurred.

  • Page 26: Qmt-1B Security

    The QMT-1B provides some web page access security options: Figure 3-4 Security Page The QMT-1B has two separate Name/Password authentication levels. The top “Administration Level” credentials allow for complete system access. A lower “User Level” credential can be created where the Administrator can select what pages can be accessed with User level credentials.

  • Page 27: Updating The Qmt-1B Software

    Check the JPS website or contact JPS Customer Service regarding the latest version available. The QMT-1B software update process is started by first browsing to the Security page. This requires Administrator level credentials. Once on the Security page, clicking on the “Software Update”...
  • Page 28 QMT-1B Operations Manual End of Section Three...
  • Page 29 The green Link Active LED is illuminated whenever the QMT-1B has an IP connection open to a companion SVM-3 module. If this indicator is not lit, either the QMT-1B does not have an active VoIP connection or the connection has been lost. Troubleshoot per Section 5.
  • Page 30 QMT-1B Operations Manual End of Section Four...
  • Page 31 Verify that the COR polarity is programmed continuously. properly. See Section 3.3.8. If QMT-1B 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 32 QMT-1B Operations Manual End of Section Five...
  • Page 33 For this and other reasons, dialup connections are not supported by the QMT-1B. I have a 100 Mbps (or gigabit) Ethernet. Can I connect the 10 Mbps port on the QMT-1B to my network? Most network equipment (hubs, switches, routers) will work with either 10Mbps or 100Mbps connection, so it should work without any problems.
  • Page 34 QMT-1B Operations Manual After losing power on one end of an QMT-1B link, it takes a while for the units to re- establish communications. Why is this? The QMT-1B will wait up to 20 seconds before determining that the link has been disconnected.
  • Page 35 Both units will respond at the same time, causing network errors. The extreme case would be if an QMT-1B is programmed to have the same IP address as an existing computer on the same network. This would likely render that computer unusable for network functions, and could cause other users to have problems as well.
  • Page 36 Should I use NAT with the QMT-1B? The only time it is advisable to use NAT with the QMT-1B is when you wish to have multiple units on a network, but have only one public IP address. An example of this would be a bank of QMT-1Bs sharing a broadband type connection such as DSL or cable modem where only one IP address is allocated by your ISP.

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