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TECH FOCUS: COAXPRESS


Coaxpress gains fibre and 3D support


Chris Beynon, Active Silicon’s CTO and technical chair of the Coaxpress committee, updates on the Coaxpress standard


T


he big update for Coaxpress was 2019’s v2.0. It added several


new features such as event packets, but the headline change was the doubling of uplink and downlink speeds, with 12.5Gb/s now supported on each cable. Image sensors are getting larger and faster, so this allows Coaxpress to continue to support the very fastest cameras on the market. A typical four-cable product now operates at 50Gb/s. In February, the Japan


Industrial Imaging Association (JIIA) released Coaxpress v2.1. Te main addition here is support for the new GenDC standard, which makes Coaxpress the first of the machine vision standards to adopt it. GenDC – Generic Data


Container – is a GenICam module that defines how image data is represented, transmitted or received independent of its format. It can describe a simple rectangular 2D image, but it can also describe metadata attached to the image, or much more complex formats such as 3D data. It’s the description of complex


formats that is the main benefit for Coaxpress. It would be a lot of work for Coaxpress, and all the other imaging standards, to each define how to represent 3D data, as an example. So everyone worked together to


Active Silicon’s 4xCXP-12 FireBird Coaxpress frame grabber (PCIe Gen3 x8)


‘GenDC clearly allows the 3D camera vendors to make much faster cameras’


define GenDC, which does all the heavy lifting of how to describe such data. Now, with GenDC support in v2.1, Coaxpress immediately has full 3D support. In addition, when a new image format comes along in the future, there will be no need to up-issue


26 IMAGING AND MACHINE VISION EUROPE APRIL/MAY 2021


Coaxpress to support it – as soon as GenDC defines the format, then Coaxpress can use it.


Coaxpress-over-fibre JIIA has just released a guideline document to support the use of optical media with the Coaxpress protocol. Tis means manufacturers of Coaxpress products can maintain the investment they’ve made in Coaxpress IP, and to offer customers real-time, deterministic behaviour they’re familiar with from Coaxpress. For many applications the


copper coax at up to 12.5Gb/s per cable continues to work very well, and gives a good balance for machine vision of camera speed, size, heat dissipation, cost and cable length. Most Coaxpress cameras, including those running at CXP-12, are too small to fit a typical QSFP optical connector, and the available small fibre optic solutions are generally very expensive. Having said that, some


applications benefit from fibre optic cables, for instance if very long cables are needed – many tens or hundreds of metres – or


@imveurope | www.imveurope.com g


Active Silicon


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