Radio Interoperability

Radio Interoperability Gateway

Radio over IP

RoIP

Voter Comparator

Receiver

Voting

Push To Talk Over Cellular

SNV-12 IP – Signal and Noise Voter Comparator (now with IP backhaul capability)

The industry-leading SNV-12 Signal and Noise Voter Comparator modular receiver voting system uses individual Digital Signal Processors to measure receiver audio quality for fast and accurate determination of the best signal.  

Our new SVM-3 modules, along with the QMT-1 modem at the receiver sites, allows transport of receiver audio via customer’s IP network , reliably handling the challenges that network delays and jitter add to the voting process.

JPS SNV-12 IP Picture

Additional Information:

Case Study:

Application Note:

The SVM-3 modules can be plugged into existing SNV-12 chassis alongside current SVM-2 modules for flexible, low cost upgrades.  The SNV-12 Signal and Noise Voter Comparator uses Digital Signal Processors to continuously monitor multiple remote receiver sites and select the receiver with the best signal quality. A typical application is an LMR system in which mobiles and portables can hear a repeater, but due to their lower transmit power, the repeater can’t hear them.

Below:  QMT-1

JPS QMT-1 for SNV-12 IP Voter

 

Benefits:

  • Bring voter audio to/from your remote sites using your network or IP microwave
  • Allows use of existing private network infrastructure, thereby eliminating the need for leased lines
  • Multiplexes voice audio and data over a standard Ethernet network
  • IP backhaul sites do not require idle tones
  • IP Backhaul sites use loss of multiple consecutive audio packets as the trigger for faulting an RX site, removing it from voting consideration until the next unsquelch event
  • SNV-12 Signal to Noise Voter interfaces easily with standard dispatch consoles
  • Detects and generates EIA key-tones in addition to hard PTT
  • Can repeat voted audio
  • Controllable locally, or remotely via IP
  • Wide range of automatic and manual transmit steering features
  • Digital audio delay ensures no loss of initial syllables
  • System expansion to 36 sites
  • 5.25” high by 19” wide rackmount modular cardcage
  • System statistics and ability to monitor voted audio available via IP
  • Dispatcher’s audio takes precedence over voted retransmissions, or may be set to mix with the repeat audio
  • Front panel LEDs assist easy setup and ongoing system diagnostics
  • Enables the formulation of low cost, extremely flexible radio communications networks

Below: SVM-3 Module

SVM-3 for the SNV-12 IP Voter

Overview:

The SNV-12 Signal and Noise Voter Comparator uses Digital Signal Processors to continuously monitor multiple remote receiver sites and select the receiver with the best signal quality. A typical application is an LMR system in which mobiles and portables can hear a repeater, but the repeater can’t hear them, due to their lower transmit power and/or the antenna size or placement.

Remote receivers can be positioned in the communications dead spots, with audio from each receiver linked to the voter via IP or T1 microwave, IP Fiber, landline, twisted pair, RF link, or fiber optics. The voter will select the best quality signal from all unsquelched remote receivers and forward this signal to the repeater for rebroadcast or monitor by a dispatcher, thus providing greater talk back range for the radios.

SNV-12 IP Block Diagram

New SNV-12 Signal to Noise Comparator with IP Backhaul Capability

The new SNV-12 Signal and Noise Voter Comparator IP Backhaul capability is a major advancement, and is backwards compatible with SNV-12 analog voters already deployed. The new SVM-3 module, along with a new QMT-1 unit (for Quality Measurement & Transport) allow the use of IP networks for transport of receive and transmit audio. The SVM-3 modules can coexist in an SNV-12 chassis along with the current SVM-2 modules. The SVM-3 allows front panel force vote and force disable, just like the SVM-2. The chassis must also have a CPM-3 with latest firmware.

The PTG-10 pilot tone generator is available for use with receivers that lack idle tone capability.

© 2019 JPS Interoperability Solutions, Inc. All rights reserved.

5800 Departure Drive | Raleigh, NC 27616 | 919.790.1011 | sales@jpsinterop.com

Radio Interoperability

Radio Interoperability Gateway

Radio over IP

RoIP

Voter Comparator

Receiver

Voting

Push To Talk Over Cellular