Apart from Vision Standards fixed and maintained by AIA – Automated Imaging Association, there are different other camera interface standards available from different manufacturers across the globe. Let us go through few interfaces which are popular now.

COAXPRESS – Worlds leading interface standard for high speed imaging.

CoaXPress (CXP) is the world’s leading standard for high-speed imaging in professional and industrial imaging applications such as machine vision, medical imaging, life sciences, broadcast and defence.

CoaXPress combines the traditional simplicity of coaxial cable with state of the art high-speed serial data technology. The combination of these two features – coaxial cable and “express” speed – provides a highly desirable solution for high-speed imaging and data transmission.The standard is hosted by JIIA with working groups from companies around the world.

CoaXPress (CXP) is an asymmetric high-speed point to point serial communication standard for the transmission of video and still images, scalable over single or multiple coaxial cables. It has a high speed downlink of up to 6.25Gbps per cable for video, images and data, plus a lower speed, 20Mbps uplink for communications and control. Power is also available over the cable (“Power-over-Coax”) and cable lengths of greater than 100m may be achieved.

Technical summary:

High-speed data rates: up to 6.25 Gbps over a single coax cable and scalable for multiple cables. (e.g. 4 cables gives 25 Gbps, 8 cables give 50 Gbps etc).

  • Roadmap to 10 Gbps and 12.5 Gbps per cable.
  •  Long Cable Lengths: In excess of 100m at 3.125 Gbps and 40m at 6.25 Gbps.
  •  Real time behavior with fixed, low latency transmission.
  •  Precise triggering capability.
  •  Flexible and reliable through use of standard coax – e.g. RG59 and RG6.
  •  Ease of integration: image data, communication, control and power over a single coax cable.
  •  Cost-effective cabling solutions
  •  Hot pluggable.
  •  Royalty-free solution.



HD-SDI stands for High-Definition Serial Digital Interface. It is the common term for a high-definition digital video transmission standard known as SMPTE 292M.

The SMPTE 292M standard is part of a family of Serial Digital Interface standards that use a coaxial cable to transport uncompressed digital video – currently still predominantly used in professional TV studios.

HD-SDI is a standard for transmitting uncompressed broadcast-grade HD video signals over short distances (although longer distances are possible with fibre optic cables).
The 292M interface of the HD-SDI standard has a nominal data rate of 1.5 Gbps. To be precise, the standard specifies two exact bit rates:

a) 1.485 Gbps – Supports 60 Hz, 50 Hz, 30 Hz, 25 Hz, 24 Hz and other commonly used frame rates.
b) 1.485/1.001 Gbps – Allows the standard to support video formats with frame rates of 59.94 Hz, 29.97 Hz and 23.98 Hz, making it upwards compatible with existing NTSC (analogue video) systems.

Cameras are available in following output modes:

HD-SDI:720p 10bit 4:2:2: 50, 59.94, 60 and 1080p 10bit 4:2:2: 23.98, 24, 25, 29.97, 30
Resolution: 1920 x 720 and 1920 x 1080 with at least 25fps.
These cameras which were targeted to broadcast applications are now used in Machine Vision applications also.

Suitable Frame grabbers are available for PCs and also laptops to capture and process this video. HD SDI video out can be connected to modern day display devices directly or by using HDMI converters to TV displays.

Online Solutions (Imaging) Pvt. Ltd., India a two decade old company can provide solutions on Coaxpress and HD SDI Camera systems for any high speed application and also cable length specific applications.

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