4k SDI

4k SDI - Best Solutions

4K resolution, also called 4K, denotes a horizontal image resolution in the order of 4,000 pixels. In most cases, the image resolution has a value of around eight megapixels. The value "4K" does not indicate which brightness and color values are coded in the images. 



Digital displaying devices, such as computer monitors, monitors, televisions or projectors, as well as recording devices, such as digital cinema cameras or digital cameras, with a column number of 4000 columns or more can be marked with the attribute "4K". This makes it clear that these devices are able to process images with this column number completely without having to combine pixels (down sampling). Images with lower image resolution can be displayed in full format on ultra-high resolution playback devices using up sampling or, as in the case of Full HD, TV line doublers.
Picture formats
The abbreviation 4K is also frequently used for various purposes for the collection, storage and transmission of image data:

  • For an ultra-high resolution video format 
  • For an ultra-high-resolution television transmission format, i.e. Ultra High Definition Television.
  • For the ultra-high resolutions used in the production of 2K und 4K2K cinema films.

The Serial Digital Interface (SDI) is primarily used for the transmission of uncompressed and unencrypted video data via coaxial cable or fiber optic. It is mainly used in the field of professional television studios and television broadcasters. The SDI interface is specified by the Society of Motion Picture and Television Engineers (SMPTE) and represents a further development of analog video standards such as PAL and NTSC method. The HD-SDI extension according to the SMPTE 292M standard is currently the predominant connection for the transmission of uncompressed picture signals for HD, digital intermediate and digital cinema in the studio and production environment. Picture, sound and metadata can be transmitted over all HD-SDI connections. HD-SDI, like SDI in general, is mainly found in professional video devices, for consumers interfaces of lower performance have established themselves. HD-SDI devices are usually only found in studios, rental houses and cinemas. A relatively new field of application is video surveillance systems, where this standard can be used to transmit images from special HD cameras over existing coaxial cable installations. HD-SDI thus enables high-resolution images in this sector without a complete conversion to IP video.

8-channel 3G HD SDI transmitter receiver, sends uncompressed signals over fiber optic cable, enabling long-distance transmission up to 120km.


• Compatible with any Serial Digital Signal up to 3.0 Gbps
• Available with internal optics for use with a single optical fiber
• Standardized channels for both CWDM bands for compatibility with Python™ systems
• Passes SDI embedded audio and all ancillary data
• Input equalization and reclocking for SDI video on buffered outputs
• Available in any custom configuration for Bi-Directional Transport up to 16 total channels
• Real-time status LED indicators for troubleshooting and monitoring
• DWDM systems available by request for higher density systems

fiber optic transmitter and receiver for 4K SDi over the fiber. 3G SDI signals over the 1 fiber with or without embedded audio and data


  • 4 Channel 3G/HD/SD-SDI (4K/UHD)
  • 4 Channels of 3G/HD/SD-SDI or DVB-ASI Over One Fiber with 4K/UHD Resolution Support
  • CWDM optical multiplexing technology, Each SDI signal has its own laser and its beeing convert to the different optical wavelength
  • Compliant with SMPTE ST 425-3, ST 425-5, 259M-2006, 292-2006, 424M-2006
  • Supports transmission of SMPTE 305M-2005, 310M-2004, 344M-2000, DVB-ASI
  • Signal is equalized and re-clocked prior to fiber optic transmission
  • Receiver features four re-clocked SDI outputs
  • Supports pathological patterns over entire link budget and operating temperature range
  • Supports both Single Mode and Multimode (62.5u & 50u) fiber types
  • Supports 3G/HD/SD-SDI inputs with or without embedded audio and data
  • Supports 4K/UHD resolutions up to 60 fps
  • 21 dB Optical Link Budget @ 2.97 Gbps for High Power, Longer Distance version
  • Standard & High Powered, long distance transmitter versions available
  • Available in compact and 19" rackmount versions

It’s not always easy to find a manufacturer that offers really high standards of professional 4K solutions together with magnificent fiber optic electronics. Thor Broadcast has used various multiplexing techniques to transmit 4k SDI signals over Fiber to easily transport these super UHD 4k signals from camera to appliance distribution. 

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