AJA FS4 1RU 4K/UHD/HD/SD frame sync, 1-ch. 4K/UHD or 4-ch. 2K/HD/SD

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Out of stock, check delivery time
Delivery time:
2 - 3 weeks


FS4 is a 4-channel 2K/HD/SD or 1-channel 4K/UltraHD frame synchronizer and up, down, cross-converter, and so much more. This combination frame synchronizer and converter offers incredible versatility and connectivity in a sleek 1RU frame for all your 4K/UltraHD and 2K/HD/SD conversion needs. FS4 offers a wide range of connectivity for both video and audio, including optional SFPs for single link 12G-SDI connectivity.  For HDR workflows, the FS4 supports automatic or configurable HDR metadata generation for the SDI output VPID and HDMI output HDR Infoframe.

In Four Channel Mode, FS4 can do the work of four separate devices in 2K/HD/SD or combine all processors and channels for maximum flexibility for 4K/UltraHD productivity in Single Channel Mode.


  • Support for two Operational Modes:
    • Single Channel Mode for 4K/UltraHD or 2K/HD frame sync and conversion
      • 4K/UltraHD/2K/HD/SD video processing and up, down, cross-conversion
      • A full range of I/O options for 4K/UltraHD including Quad 1.5G; Dual 3G; and Quad 3G, 6G, and 12G over a range of Coax and optional Fiber choices
      • Enhanced Single Channel Mode offers the ability to simultaneously output 4K/UltraHD and a down-converted 2K/HD/SD via the SDI Monitor output.
    • Four Channel Mode for simultaneous independent 2K/HD/SD frame sync and conversion
      • 2K/HD/SD up, down, cross-conversion
      • SD/SD aspect ratio conversion
      • HD/HD cross-conversion (720p/1080i)
  • Widely interoperable with 4K/UltraHD/2K/HD raster support, SQD and 2SI mapping conversion, P, PsF, and Interlace support
  • Configurable HDR settings for SDI output VPID
  • HDMI HDR Infoframe generation to support HDR displays per HDMI v2.0b/CTA-861-G for any 2K/HD HDMI output format and 2K/HD output down-scaled from 4K/UltraHD
  • Built-in Test Pattern Generator including HDR Color Bar Test Patterns
  • Audio I/O processing with a 272 x 208 matrix of audio possibilities; support for a flexible range of audio feeds from discrete AES to MADI and embedded SDI audio, with each audio input offering sample rate conversion
  • Simple operation, a redesigned FS menu structure, and quick access to features via front panel buttons, as well as a web-based UI offering control over a LAN or across the web via a REST API
  • A 1RU frame offering space, power, and cost efficiencies ideal for broadcast trucks, postproduction, or broadcast settings
  • Five year warranty

Configurable Frame Delay

As sports fans have come to expect a more dynamic, interactive experience, augmented reality (AR) is quickly becoming a common and valuable production asset, but one that requires additional video processing time.  For seamless integration of AR into live productions, larger frame buffering capacities are required to delay other sources. 

FS4 offers the largest configurable frame delay in its class of up to 20 frames per channel, ensuring all sources stay in time.

Different Modes for Different Needs

FS4 offers various modes of operation for comprehensive conversion and signal processing.

Single Channel Mode provides a full suite of 4K/UltraHD processing and up, down, cross-conversion to and from 2K, HD, or SD.

Enhanced Single Channel Mode provides simultaneous 4K/UltraHD and 2K/HD outputs where the 2K/HD monitor output can have its own unique down-conversion applied.

Four Channel Mode offers 4x 2K/HD/SD channels of simultaneous conversion and processing, all within an elegant 1RU chassis for multi-channel high density delivery.

Up, Down, Cross-Conversion

Moving to 4K is never an instant change. Legacy signals and archival material need to be integrated into the 4K environment, while 4K/UltraHD sources need to be down-converted for current 2K/HD pipelines.

Utilizing AJA's remarkable conversion algorithms, FS4 supports up, down, cross-conversion from 2K/HD/SD to 4K or UltraHD.  Both Square Division (SQD) and Two Sample Interleave (2SI) pixel mapping formats are supported.

AJA's powerful hardware conversion technology ensures the highest image quality for your productions. Key conversion features include:

  • 4K/UltraHD/2K/HD/SD up, down-conversion
  • SD/SD aspect ratio conversion
  • HD/HD cross-conversion (720p/1080i)

All done in beautiful 10-bit with dedicated hardware.

12G/6G HD-BNC and
Fiber SFP Options

FS4's SFP options include both 12G/6G-SDI HD-BNC and LC Fiber I/O options, including single and dual channel Single Mode options and Multi-Mode options, allowing great SDI flexibility and fiber cable runs of up to 10 kilometers to be connected directly to the FS4 without the need for separate fiber to SDI conversion. Also available are 3G-SDI Fiber LC and SC SFP options.

Optional 12G/6G-SDI SFPs:

  • HDBNC-2TX-12G:  12G/6G-SDI Dual Coax HD-BNC Transmitter
  • HDBNC-2RX-12G:  12G/6G-SDI Dual Coax HD-BNC Receiver
  • FIBERLC-1TX-12G:  12G-SDI Single Fiber LC Transmitter Single Mode 1310nm
  • FIBERLC-1RX-12G:  12G-SDI Single Fiber LC Receiver Single Mode 1310nm
  • FIBERLC-2TX-12G: 12G/6G-SDI Dual Fiber LC Transmitter Single Mode 1310nm 
  • FIBERLC-2RX-12G: 12G/6G-SDI Dual Fiber LC Receiver Single Mode 1310nm

Optional 3G-SDI Single Mode SFPs:

  • FIBERSC-1-TX:  3G-SDI Single Fiber SC Transmitter Single Mode 1310nm
  • FIBERSC-1-RX:  3G-SDI Single Fiber SC Receiver Single Mode 1310nm
  • FIBERLC-1-TX:  3G-SDI Single Fiber LC Transmitter Single Mode 1310nm
  • FIBERLC-1-RX:  3G-SDI Single Fiber LC Receiver Single Mode 1310nm
  • FIBERLC-2-TX:  3G-SDI Dual Fiber LC Transmitter Single Mode 1310nm
  • FIBERLC-2-RX:  3G-SDI Dual Fiber LC Receiver Single Mode 1310nm

Optional 3G-SDI Multi-Mode SFPs:

  • FIBERLC-1TX-MM:  3G-SDI Single Fiber LC Transmitter Multi-Mode 850nm
  • FIBERLC-1RX-MM:  3G-SDI Single Fiber LC Receiver Multi-Mode 850nm
  • FIBERLC-2TX-MM:  3G-SDI Dual Fiber LC Transmitter Multi-Mode 850nm
  • FIBERLC-2RX-MM:  3G-SDI Dual Fiber LC Receiver Multi-Mode 850nm