NMX-DEC-N2251-C Decoder Card (discontinued)

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

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Replacement Products

  • NMX-ACC-N9206


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

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.













  Version Language Size Uploaded
file type icon NetLinx Control for N-Series Products Documentation Addendum
updated: Oct 2020
    1.05 MB Oct 2020
file type icon Instruction Manual - NMX-ENC-N2151 / NMX-DEC-N2251 JPEG 2000 4K UHD Video over IP Encoder with KVM
updated: Jun 2020
    7.72 MB Jun 2020
platform icon SVSI SNMP MIB
updated: Jul 2020
    9.8 KB Jul 2020
platform icon SVSI N-Able PC
version 2023-09-03, updated: Sep 2023
2023-09-03     191 MB Sep 2023
platform icon SVSI N2x51 Encoder and Decoder Firmware Updater
version 1.5.3f, updated: Nov 2021
1.5.3f     64.4 MB Nov 2021
Data Sheets
file type icon NMX-DEC-N2251, JPEG 2000 4K UHD Video over IP Decoder with KVM
updated: Oct 2020
    680 KB Oct 2020
Install Guides
file type icon SVSI Networked AV - Pre-Implementation Guide
updated: Aug 2023
    1.15 MB Aug 2023
Quick Start Guides
file type icon Quick Start Guide - NMX-ENC-N2151 / NMX-DEC-N2251 JPEG 2000 4K UHD Video over IP Encoder with KVM
updated: Mar 2018
    334 KB Mar 2018
Programming Guides
file type icon API Command List - SVSI N1000/N2000 Series
version F, updated: Jun 2020
  277 KB Jun 2020
Product Guides
file type icon Product Guide - N-Series Video Wall/Crop Limitation
updated: Oct 2020
    72.8 KB Oct 2020
file type icon Product Guide - N-Series Minimum Network Requirement
version B, updated: Oct 2023
  166 KB Oct 2023

If any of the links above result in strange characters in your browser, please right-click the file to save it to your computer.


  • 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
HARMAN Professional Solutions:

NMX-DEC-N2251-C Decoder Card (discontinued)

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