Digital Silence Detector & Change Over

The new generation of AxelTech digital silence detector and change over continues in the tradition of quality, reliability and cost effectiveness, renowned and valued in the broadcasting environment all around the world.

FOX 3 is a fully digital audio modular platform which combines Switcher & Changeover, Silence Detector, format conversion, FM tuner.
The new platform offers cutting-edge technology that feats the ease of use, exceptional performances and unparalleled sound quality.

FOX 3 provides the widest range of I/O to match the most High-end broadcast user requirements. Any inputs can be routed to a different audio output thanks to the A/D and D/A converter.

  • FOX 3 is a fully configurable Audio Changeover/Silence Detector to switch over four out of the Analog, Digital, MPX, IP, AoIP, DanteTM (optional) and Built In Player inputs.
  • The hardware bypass circuit guarantees audio presence and programs continuity.
  • Full range of outputs: one analog, two digital audio (over XLR connectors) and two Optional DanteTM .
  • FOX 3 can integrate with existing infrastructure via Ethernet port, two USB ports and six GPI ports with optical coupler and four relays.
  • A LAN port and a built-in Web Server to control & configure the processor from any device and tune audio from anywhere also using the IP streams I/O.
  • FOX 3 Logs every second on the external microSD card the value/status of 8 out of 88 internal parameters for 1 year (at the end of the period oldest data will be overwritten). The user can choose the 8 parameters to be logged and can select a time lapse among the logging to export the data on a CSV file for any analysis.
  • FOX 3 is equipped with a universal 90-260 V AC power supply, working at 50 or 60 Hz, ready to be used in every country around the world. Thanks to the low power consumption (max 15 W) FOX 3 is also a green equipment.
  • FOX 3 one Rack Unit robust design is sustained by the extensive use of steel and aluminum. FOX 3 appliances are immune to strong electro-magnetic fields and are suitable to be installed in extreme climate environments.
  • A dedicated digital test signal generator can send to all the physical outputs (analogue & digital) signal sample with variable frequency and amplitude to help calibrate the whole audio chain.

FOX 3 Changeover/Silence Detector integrates many though needful features for the radio workflow:


Extended Changeover/Silence Detector with configurable source priorities out of the following sources: 1xAnalog, 2xAES/EBU, 2xIP, 2xMPX, 2x DanteTM (Optional), 1xInternal Player



1xAnalog, 2xAES/EBU, 2x DanteTM (Optional)


(Simple Network Management Protocol)

Allows data interchange and simplified configuration of third-party appliances connected in the same LAN using shared datasets MIB.


Internal microSD card with OS for Disaster Recovery. Easily Upgradable via WEB or Windows application.


The whole system can be managed through a WEB page generated by the internal web Server. The main functions can be managed through the physical panel.



The new FOX 3 is a technologically advanced Audio Changeover/Silence Detector able to switch between any available source: Analog, Digital, MPX, FM, IP, AoIP…In case of missing audio from any external sources, the FOX 3 can play the playlist stored in the microSD.

An embedded Test Signals Generator allows to output an audio signal suitable for testing the equipment or the whole audio system.

I/O Connections

FOX 3 features a complete set of input and outputs connections. Analog and AES/EBU digital audio connections are standard aside of two buffered: Analog Input > Analog Output | Digital1 Input > Digital1 Output | Digital2 Input > Digital2 Output

Three USB ports (one on the front, one on the rear panel and one installed on the internal circuit board), are available.

microSD allows to clone the whole setup from one FOX 3 to another one.

DanteTM connection, available as an option, allows to manage AoIP DanteTM or AE67 signals: 2 Stereo inputs and 2 Stereo outputs.

Front Panel

FOX 3 features a wide Color TFT Technology display (480×128) that shows the input and output processing, including the corrections for each band featured from the compressor, the limiters and the multiband AGC.

Obviously, it also shows the input and output of all signal levels.

Moreover trough the display it’s possible to check the system status: operating parameters and GPI/O port status.

A TRS (stereo Jack 6,3 mm) connector allows monitoring both original and processed signal, checking in the faster way the differences between the available presets.

Communications & Alarms

FOX 3 Silence Detector/Change Over can exchange information with other equipment through some communication ports: One LAN/WAN port, two USB ports, one GPIO port with optical coupler and relays.

Information will be sent (status, alarms) or received (commands). A panel with 40 LEDs and the LCD display show status information.

Alarm messages can be sent via GPO, SNMP (Trap), and http.

Web Server

Users can manage FOX 3 equipment via LAN, no need to install any client software. The internal Web Server can be managed with any browsers (Chrome, Firefox, Explorer, Opera…). The GUI on the web page is clear, easy to use and responsive, suitable to be managed from any device: Personal Computers, tablets, smartphones.

SNMP (v 2.0c) programming protocol allows to manage the whole command set. FOX 3 firmware also implements HTTP, FTP, SNMP, SMTP, UDP, TCP and is PV4 – IPV6 addressing compliant.

Moreover, connecting an external GPS allows to geo-localize the FOX 3. The WEB server supplies a page with a map that shows the appliance position. Standard Ethernet interface can manage up to 4 independent TCP ports, up to 4 separate UDP ports and 1 SNMP port. Obviously, it also shows the input and output of all signal levels.


DanteTM option (also supporting AES67 and SMPTE ST 2110-30 transport protocols) provides an Ethernet connection for 2 Stereo Input and 2 Stereo Output, with independent and dedicated Level Control and Sample Rate Conversion.

Analog Input - AUDIO
Number of Inputs1 Stereo
Connectors:2 XLR, female - Electronically balanced – EMI Suppression
A/D Conversion:24bit Sigma-Delta Conversion (Crystal CS4272)
AD Clipping Point+24.0 dBu
Operative Nominal LevelFrom –12.0dBu to +13.0dBu (0.1dBu Step) Software adjustable
Line Impedance10 kΩ (Electronically balanced selectable)
DistortionLess than 0.01% TDH+NOISE (0.0 dBu 1Khz)
AD Dynamic Range108 dB RMS (110 dB A weighted)
Input ModesStereo, Mono (Left), Mono (Right), Mono (Left+Right)
CMRR input>60 dB (20 Hz to 20 kHz)

Digital Input – AUDIO
Inputs Number2
ConnectorsXLR, female – Electronically balanced– EMI Suppression
Input impedance110 Ω
Sample rate32 kHz / 44.1 kHz / 48 kHz /96 kHz / 192 kHz with src and jitter attenuation
Operative Nominal levelFrom 0.0 dBFs to -25.0 dBFs (0.1 dBu step) Software adjustable
Dynamic Range125 dB (Typical), 122 dB (Minimal)
Distortion Less than 0.01% TDH+NOISE (0.0 dBu 1Khz)
Input ModesStereo, Mono (Left), Mono (Right), Mono (Left+Right)
Conversion dynamic range124 dB (32 KHz) | 126 dB (44,1 kHz) | 126 dB (48 kHz) 122 dB (96 kHz)
Conversion resolution24 bits

Input Number2
ConnectorsUnbalanced on BNC – EMI Suppression
Input impedance50 KΩ
Adjustable Nominal Input Level (Sensitivity)-6 dB to +13,0 dB (0.1 dBu step) Software adjustable
Max Input Level+18,0 dBu
A/D ConversionTexas PCM4220

Analog Output AUDIO
Output Number1 Stereo
Connectors2 XLR, female - Electronically balanced – EMI Suppression
D/A Conversion24 bit Sigma-Delta Conversion (Crystal CS4272)
Output Level-6.0 dBu to +20.0 dBu (0.1 dBu Step)
Output Level Max.+ 24,0 dBu
Output Impedance10 Ω
Load Impedance600 Ω or greater
THD + NoiseLess than 0.01% (0.0dBu @ 1 kHz)
Signal to noise Ratio>80 dB unweight - 100% Mod. 20 Hz–15 KHz
L/R CrossTalk< –70 dB, 20 Hz–15 KHz

Digital Output AUDIO
Outputs Number2 (1st for audio, 2nd for audio or Digital MPX)
ConnectorsBalanced on 1 XLR – EMI Suppression
Output impedance110 Ω
Sample rates32 kHz / 44.1 kHz / 48 kHz / 96 kHz / 192 kHz Software selectable
Resolution24 bit
Operative Nominal levelFrom 0.0 dBFs to -30dBFs (0.1 dBu step)
Dynamic Range125 dB (Typ), 122 dB (Min)
DistortionLess than 0.01% TDH+NOISE (0.0 dBu 1 Khz)

Connection with radio automation: SoftwareYes
Network connectivity4 TCP ports / 4 UDP / 1 SNMP
Configuration softwareWeb Server, FTP
Password protectionYes
ASCII ProtocolConfiguration messages
REST CommandYes
Alert notifications on user-defined events via SNMP trapsYes
Embedded SNMP agent permitting: active management tasksYes
Supported Network ProtocolsHTTP, SNTP, UDP, TCP, NTP, FTP

System Features
Remote interface GPIn 6x GP In optocoupled
Remote interface GPOut 4x Relays – dry contacts
Remote interface connectorDB 25 female connector - EMI suppressed
Remote interface GPIO Voltage and CurrentDC 5V Source and Sink 10 mA
Communication Port2 x RS232, 3 x USB, 1 x LAN
Serial Interfaces1st RS232 on DB9 female connector - EMI suppressed
2nd RS232 on DB25 female connector - EMI suppressed
Firmware can be upgraded in the fieldYes
Front-panel Colour TFT DisplayNo (Falcon X6) / Yes (Falcon X5, X7, D7 and Fox 3)
Data may be entered on-site with Front-panel ButtonsNo (Falcon X6) / Yes (Falcon X5, X7, D7 and Fox 3)
Front Panel LEDs40

Dimensions485 x 44 x 240 mm (1 rack unit)
AC Rate Voltage230Vac / 110Vac +/- 10% - 30VA – Connector IEC 3-Wire detachable
AC Frequency50 Hz / 60 Hz +/- 4%
Power factor0,9
Processing architectureFully digital, based on DSP 24bit/250Mhz.
5 band Signal processing
Weight3,5 Kg
Operating temperature-5°C / +50°C up to 95% non condensing
Max AltitudeUp to 3000 meters above marine level
Safety StandardCE
RFIThe equippment has been designed to work in strong RF Fields and it is provided with Standard RFI filters. Necessary RFI filters are standard and same are provided.
GroundingOne more earth terminal are provided in the body to connect audio ground

    Input & Output

    • 3 microphone inputs
    • 4 stereo analogue inputs
    • 4 stereo analogue outputs
    • 1 built-in telephone hybrid,
    • 1+4 telco interface with GPIO
    • Bluetooth audio interface (optional)
    • 1 digital Out (AES/EBU)
    • 2 USB audio interfaces (disabled with Dante option installed)
    • 8 stereo inputs + 8 stereo outputs via Dante (optional)


    • Fully Digital Broadcast Console for Radio Broadcasting with 6 faders
    • A/B Fast source switch buttons for each fader
    • 4+1 busses (PGM, SUB, Aux1, Aux2, PFL)
    • Near 0 latency (< 0,7 ms I/O)
    • Digital Signals Routing via the 48×48 internal matrix
    • Complete Remote Control by means of an application replicating the surface
    • Remote configuration and maintenance via Web Interface
    • User-definable Presets & Snapshot
    • 5 bands fully parametric Equalizer on every input
    • Dynamic Processor with expander and compressor section on each microphone inputs
    • Advanced and configurable Monitor Facilities for Control Room and Studio
    • Customizable RGB colored buttons
    • High Resolution (120 leds) meter bars for outputs
    • HDMI Out for console status display
    • 2 Timers (Ctrl-Room and Studio microphones timers on HDMI Monitor)
    • TalkBox for guest and presenter (optional)


    • Oxygen 1000
    • Oxygen 1000 – Bluetooth
    • Oxygen 1000 – Dante
    • Oxygen 1000 – Dante – Bluetooth


      • Talk Box
      • RJ45 adapters for:

    o Mic with GPIO
    o Line In
    o Line Out with GPIO
    o Telco with GPIO

    Microphone Inputs

    • 3 Microphone Inputs
    • Mic 1 on XLR, Mic 2 & 3 on RJ45: 2-3, all balanced with + 48V Phantom and GPIO
    • Independent ON AIR Lights and Cut Off control, when opening Control Room and Studio microphones
    • PFL button switches to private conversation on Hybrid/Telco/Bluetooth mode
    • Enable TalkBack feature on any Studio or Control Room microphone
    • Parametric Compressors/Expander (drive, threshold, attack time, release time) for MICROPHONE and MONO inputs
    • Save and recall microphone presets including Compressor/Expander settings
    • Phase inversion on microphone inputs
    • MONO inputs assignable as EXT source
    • Ducking / AutoFader assignable to all sources (automatic attenuation of music on speech)

    Analogue inputs

    • Line Stereo Inputs: 4
    • Balanced on XLR for Line 1, Balanced on RJ45 for Line 2-4
    • Channel mode selection: STEREO, MONO, L, R, INV-L, INV-R, INV
    • Stereo-1 & DANTE-1 inputs can be configured as 4 Telco Inputs

    USB audio I/O

    • 2 Built-in stereo USB (Type-B) I/O Audio Interfaces allow to directly connect the PC to the Oxygen 1000 console, with no need for audio cards
    • In facts the PC detects each of the console USB as a digital audio card with 1 stereo inputs and 1 stereo outputs for simultaneous playout and recording

    Telephone hybrid and Telco

    • Telephone Hybrid: 1 POTS/PSTN telephone line with Line.In and Tel.Set connection
    • Telco: 1 in/out N-1 to connect external telephone hybrid with control via TLC/GPIO
    • 4 mono additional Telco can be obtained configuring Analog Inputs (Stereo-1 & DANTE-1) and (OUT-2 & DANTE-1) stereo outputs.
    • GPI and GPO management on all 5 Telco channels
    • RING and HOOK on F1 key for each TELCO channels
    • N-1 on Telco outputs for all BUS (PGM, SUB, AUX-1, and AUX-2)

    Analogue outputs

    • 4 Balanced Outputs:
      • OUT-1 – XLR – Fixed as PGM
      • OUT-2 – XLR – by default assigned as SUB
      • OUT-3 – RJ45 – by default assigned as AUX-1
      • OUT-4 – RJ45 – by default assigned as AUX-2
    • OUT-2 stereo output can be configured as N-1 to achieve up to 2 mono additional Telco
    • OUT-1 & OUT-2 outputs are both equipped with a GPO

    Digital output

    • 1 AES/EBU output on XLR

    Headphones and local monitor outputs

    • OUT-2-4 outputs: can be configured as Studio Presenter and Studio Guest Headphones
    • Unbalanced outputs: 2 Line out on Jack 6.3 for Control Room Headphones
    • Adjustable maximum Control Room and Studio speakers volume (Studio Speaker only via SW)
    • Adjustable maximum Control Room and Studio headphones volume (Studio Headphones only via SW)
    • Adjustable CUT or Attenuation mode (-40, -30, -20, -10 dB) on Control Room and Studio speakers
    • Independent source selection (PGM, SUB, AUX1, AUX2, EXT) for control room and studio speakers, control room and studio headphones with or without PFL
    • Independent Talk Back management on Control Room and Studio speakers
    • Independent Talk Back management on Control Room, Studio headphones
    • Same source selection for Control Room and Studio headphones, with independent level


    • GPI: 9 in total, for Talk back, Telephone Hybrid or other features
    • GPO: 9 total, to control OnAir lamps or provide HOOK and RING commands for external telephone Hybrid
    • User custom GPIs (e.g. Ring, Talkback, channel ON/OFF, etc.)
    • User custom GPOs (e.g. Hook/ONAIR, Studio-Light, Control Room-Light)

    Surface & Management

    • Automatic firmware update via Internet
    • WEB UI for Console configuration and service features (Save, restore, update, logs, etc.)
    • Save and recall EQ presets (up to 10)
    • New real-time EQ algorithm with graphic
    • Fast and accurate Led Meters display
    • Save and recall control panel configuration with 10 Snapshots
    • Save and recall total console configuration. The configuration can be saved to internal memory (microSD), USB and PC (via WEB interface)
    • Gain adjustment knobs with adaptive speed
    • Dimmable buttons light
    • Adjustable fader ON/OFF threshold (from -50 dB to 0 dB)

    Telephone Hybrid and Telco

    The built-in telephone hybrid allows direct connection of a telephone line POTS/PSTN on RJ-11C. The audio is processed via DSP that delivers a state-of-the-art audio processing. It’s also available a Telco N-1 in/out, to connect Oxygen 1000 to an external telephone hybrid. The Telco N-1 is always available on RJ45. TLC commands are available on the same RJ45 with Hook and Ring interface.

    TLC commands for Telco-2-5 are available and configurable on GPIO-DB9 connector with Hook and Ring.

    HDMI output

    The HDMI output allows to connect a HD display monitor to the console, suitable to be used in two flavors:

      • Monitor, that displays the following information:
          • Audio input source levels
          • 4+1 BUS output levels
          • A/B source names assigned of 10 channels
          • Display On-Air sources
          • Microphone On timer (control room & studio)
          • Large Clock
          • Audio output level (Loudspeakers & Headphones)
          • On-Air microphone
          • Telephone active
        • Configure, for configuring all of the device features.
          • HDMI output combined with 4 rotary knobs allow the fast and intuitive programming of all the mixer parameters.
          • The programming GUI has been designed in order to be very easy and intuitive.
          • Selectable home page layouts are available, with many theme icons.

    HDMI output can be personalized with the customer logo. Selectable display layouts are available.


    Oxygen 1000 can be equipped with a Bluetooth module. This allows airing the calls made via GSM, Skype, Viber and WhatsApp with a Smartphone, a Tablet or a PC. Oxygen 1000 has two Bluetooth connection modes: bidirectional to support phone calls; monodirectional to put on air high quality stereo audio (A2DP) streamed by Bluetooth sources.

    With Bluetooth calls, PFL enables PRIVATE conversation mode.

    Bluetooth interface is installed at the factory and must be requested at ordering stage.

    Talk Box

    It is a device dedicated to the presenter and guests. Talk Box is very simple to connect to the On Air Console: its take 2 RJ45 cables of the length that is needed to connect it to the mixer. It is possible to connect up to 2 Talk Boxes to the Oxygen 1000. The Talk Box offers a direct connection of the microphone and relative On-Air light, it is also possible to directly connect the studio’s On-Air Light. The Talk Box has a headphone amplifier with two 6.3mm outputs. Through the two large backlit buttons it is possible to activate and deactivate your own microphone (On / Off / Cough) or enable Talk back to the console.

    Dante AoIP Interface

    Oxygen 1000 can be equipped with a Dante (compliant with AES67) interface which provides 8 Stereo Input and 8 Stereo Output on a dedicated Ethernet port, with independent Level Control and Sample Rate Conversion.
    On Oxygen 1000 Dante versions the USB I/O ports are disabled.
    Dante AoIP interface is installed at the factory and must be requested at ordering stage.

    Cable Adapters

    RJ45 adapters are available for:
    o Mic with GPIO
    o Line In
    o Line Out with GPIO
    o Telco with GPIO

    Analog Balanced Microphone Inputs
    ConnectorRJ45 & XLR Balanced – EMI Suppressed
    Input Impedance2,4 KΩ
    Nominal Input Level (sensitivity)-9/-66 dBu
    Max Input Level (clipping point)+9 dBu
    A/D conversion24 bit / 48 Khz
    Signal To Noise Ratio (referred to peak level)>90 dB
    Analog GainAdjustable +0 ÷ +57 dB (3dB step)
    Phantom Power+48V

    Analog Balanced Stereo Inputs
    ConnectorXLR & RJ45 Balanced – EMI Suppressed
    Input Impedance10 KΩ
    Nominal Input Level (sensitivity)0 dBu
    Max Input Level (clipping point)+18 dBu
    A/D conversion24 bit / 48 Khz
    Frequency response+/-0,5 dB from 20 Hz to 20 kHz
    Signal To Noise Ratio (referred to peak level)>100 dB
    Stereo Separation (referred to peak level)>90 dB
    THD+N<0,002 %

    Analog Balanced Telco Input
    ConnectorRJ45 Balanced – EMI Suppressed
    Input Impedance10 KΩ
    Nominal Input Level (sensitivity)0 dBu
    Max Input Level (clipping point)+18 dBu
    A/D conversion24 bit / 48 Khz
    Signal To Noise Ratio (referred to peak level)>100 dB

    PSTN Interface
    Transhybrid loss>20 dB

    Analog Balanced Stereo Outputs
    ConnectorRJ45 Balanced – EMI Suppressed
    Output Impedance23 Ω, nominal 600 Ω
    Nominal Output Level0 dBu
    Max Output Level (clipping point)+18 dBu
    D/A conversion24 bit / 48 Khz
    Signal To Noise Ratio (referred to peak level)>100 dB
    Stereo Separation (referred to peak level)>90 dB
    THD+N<0,002 %

    USB Audio Digital I/O
    ConnectorUSB Type B – EMI Suppressed
    Playback And Recording Sample RateSRC 44.1-48 KHz
    Resolution16 bit
    Available Stereo Channels1 Play & 1 Rec for each USB interface

    Digital Output
    ConnectorBalanced on 1 XLR – EMI Suppressed
    Input Impedance110 Ω
    Audio Sample Rate48 KHz
    Resolution24 bit
    Dynamic Range (Converter Values)124 dB

    Analog Balanced Telco Output
    ConnectorRJ45 Balanced – EMI Suppressed
    Output Impedance23 Ω, nominal 600 Ω
    Nominal Output Level0 dBu
    Max Output Level (clipping point)+18 dBu
    D/A conversion24 bit / 48 Khz
    Signal To Noise Ratio (referred to peak level)>100 dB
    THD+N<0,002 %

    Audio CoreAnalog Devices ADAU1452 32bit 294 MHz fixed point DSP
    Audio CODECsCirrus CS42448 24 bit/192 kHz
    System CoreAllwinner A20 dual core cortex-A7 at 800MHz, 1GB RAM
    LAN ConnectionRJ45 - 100Mbit
    Nominal Delay (analog input to analog output)0,7 ms
    GPIO Inputs/Outputs4 GPI/4 GPO on DB9; 4 GPI/2 GPO on Mic2 & Mic3 RJ45; 2 GPO on Out3 & Out4 RJ45; 1 GPI/1 GPO on Telco RJ45
    Communication Port2xUSB type-A, 2xUSB type-B , 1xLAN, 1xHDMI
    Operating Temperature0°C ÷ 40°C

    Power Supply90-260 VAC / 47-63 Hz / 30 W

    Dimensions (W; H; D)344mm; 80mm; 343mm
    Weight< 5Kg