NMX-DEC-N2251-C Decoder Card

JPEG 2000 4K UHD Video over IP Decoder with KVM, Card

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The NMX-ENC-N2151 4K Encoder and NMX-DEC-N2251 4K Decoder provide users with the industry's most versatile solution for distributing AV over a converged network at resolutions up to 4096×2160. JPEG2000 compression allows Ultra HD media to be switched and distributed over standard Gigabit Ethernet networks. Ultra HD signals from the NMX-ENC-N2151 encoder are provided simultaneously as: 1) a JPEG 2000-compressed 200-600 Mbps stream through the RJ-45 connector or SFP+ port and 2) an uncompressed stream through the small-form-pluggable (SFP+) connector (via a fiber SFP+ module). Any source can be sent to any number of displays by routing through layer-3 switches. System scalability is limited only by uplink and stacking connector bandwidths but can accommodate up to 100 Ultra HD video sources at once.

Standard features like output scaling (decoder), bi-directional serial, IR, embedded 7.1 audio, and KVM-over-IP extension are included. The NMX-ENC-N2151-C and NMX-DEC-N2251-C form-factors are compatible with the NMX-ACC-N9206 card cage for high-density applications.

Common Applications

The NMX-ENC-N2151 and NMX-DEC-N2251 together create the perfect solution for video matrix applications where resolutions up to 4K are required. Common applications include classrooms, conference rooms, performing arts centers, and sports bars.





  • Output Scaling – Video scaling at the output (decoder) allows seamless switching from any source, at any resolution, to any display or projector, while preserving video fidelity
  • Infrared (IR) – Infrared emitter connection allows control of low-cost, IR-only display devices
  • Onboard Control – All N-Series encoders and decoders have on-board, built-in control capability via events that can trigger any number of TCP/UDP commands to other IP controllable devices
  • Unlimited Scalability
  • Stand Alone or Card – Available as a stand-alone device, or card for use with NMX-ACC-N9206


  • Signal Types
    • Video Input: Network video over Ethernet via RJ45 port
    • Video Output: HDMI, DVI-D (through adapter)
  • Formats
    • HDMI, DVI-D (through adapter), HDCP content protection support
  • Output Resolutions
    • Supports most common HD up to 4096x2160. See website for all supported resolutions.
  • Signal Types
    • Input Signal Types: Network audio over Ethernet via RJ45
    • Output Signal Types: Embedded audio on DVI-D or HDMI (through adapter)
    • HDMI Audio Formats: 8ch PCM
    • Analog Audio Format: Stereo 2-channel
    • Digital-to-Analog Conversion: 16-bit 32 kHz, 44.1 kHz and 48 kHz (matched to network audio stream settings)
  • Uncompressed:
    • 25 ms at 60 fps
    • 50 ms at 30 fps
  • JPEG2000:
    • 50 ms at 60 fps
    • 100 ms at 30 fps


Note: This is the combined encode plus decode latency. Total latency from source to screen will also include any network latency.

Note: Scaling adds one frame of latency (16ms at 60fps)

  • Ethernet
    • P0: 10/100/1000 Mbps, auto-negotiating, auto-sensing, full/half duplex, DHCP, Auto IP, and Static IP
    • P1: Full duplex, DHCP, Auto IP, and Static IP 10 Gbps port which accepts compatible fiber transceivers or direct attach cables (fiber or copper cabling)
  • +12V 2A: One 12 Volt DC power input
  • P0
    • 8-wire RJ45 female
    • 10/100/1000 Mbps 10/100/1000Base-T auto-sensing gigabit Ethernet switch port
    • Provides network control connections and compressed network AV output
  • P1
    • SFP+ port (SFP+ fiber transceiver or direct attach cable not included) for uncompressed or compressed networked AV and allows network control connections
  • IR
    • 2-pin terminal Phoenix connector
    • Provides Infrared (IR) output only (33-60 kHz; typically 39 kHz). Emitter may be necessary (not included)
  • RS232
    • 3-pin terminal Phoenix connector
    • Provides a serial control interface. Full duplex communication. Available terminal speed settings: 9600-115200 baud rate
    • 5-pin terminal Phoenix connector
    • Dedicated audio output
  • HDMI OUT: HDMI video output
  • USB connectors (front panel): USB-B control input and two USB-A control inputs Currently only the USB-A connectors are supported in software for HID devices
Controls and Indicators - Front Panel
  • RESET Button
    • Recessed pushbutton
    • Hold 30 seconds for a factory reset of all settings, including IP address settings
    • Press to initiate a 'warm restart' causing the processor to reset, but not lose power. A reset does NOT affect the current settings
  • ID Button
    • Recessed pushbutton
    • Press to send a notification out on the network to identify the unit (the notification causes a pop-up dialog in N-Able and N-Command)
    • On solid (green) when operating power is supplied (via PoE or local power supply)
    • This activity is also shown by the PWR LED on the rear panel
    • On flashing (green) when there is software activity
    • This activity is also shown by the STAT LED on the rear panel
Controls and Indicators - Rear Panel
  • PWR LED: Same as POWER LED described above
  • HDMI LED: On (green) when there is a connection to a valid display
  • STAT LED: Same as STATUS LED described above
  • STRM LED: On (green) when the unit is streaming video
  • Regulatory Compliance: FCC, CE, and NTRL
  • Recommended Accessories:
  • NMX-ACC-N9206 (FGN9206), 2RU Rack Mount Cage with Power for Six SVSI N-Series Card Units
Compatible AMX Products

Audio/video content sent from the encoder is compatible with the following products:

  • NMX-ENC-N2151 (FGN2151-XX) JPEG 2000 4K UHD Video over IP Encoder with KVM
  • NMX-ATC-N4321 (FGN4321-XX) Audio Transceiver, 2 Channel
    • N4000 Audio only
  • NMX-NVR-N6123 (FGN6123) Network Video Recorder
    • Record and playback single stream only. Archive functionality is not supported.
FG Numbers FGN2251-CD

Recommended Accessories

  • NMX-ACC-N9206

    2RU Rack Mount Cage with Power for Six SVSI N-Series Card Units

NMX-DEC-N2251-C Decoder Card

JPEG 2000 4K UHD Video over IP Decoder with KVM, Card