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Standards comparison Camera Link


Release date October 2000 May 2012 Bandwidth


255 MB/s (Base) to 850 MB/s (80-bit)


Cable length 10m


3.125 Gb/s (M protocol); 10.3 Gb/s (X protocol)


15m (C2 copper); 500m (fibre


optic); 10m (direct attach)


Cable type


Power over cable


Frame grabber required


Camera Link Optional Yes CX4 or fibre No Yes


Camera Link HS CoaXPress


GigE Vision


December 2010 May 2006 6.25 Gb/s


1 Gb/s, (2 Gb/s with Link Aggregation); 10 Gb/s for 10GigE


100m (CXP-1); 85m (CXP-3); 35m (CXP-6)


Coaxial Yes Yes


Source: Global machine vision interface standards, 2014, AIA, EMVA and JIIA www.emva.org/cms/upload/Marketing_edocs_download/FSF_Vision_Standards_Brochure_A4_screen.pdf


needed in many types of applications. Tis has been furthered with GigE Vision and now USB3 Vision. ‘Rather than simply being a more affordable alternative, these standards [GigE Vision and USB3 Vision] have become mainstream technologies used to connect cameras to vision systems,’ Gross said. Tere are some similarities between GigE


Vision and USB3 Vision, but the main difference is in terms of throughput and cable length. USB3 can transmit at about four times the speed of Gigabit Ethernet, but it offers limited cable length, in the three- to seven-metre range, whereas GigE Vision can go up to 100 metres. ‘GigE Vision is perfectly suited for most


sensors where the acquisition is below 115 MB/s,’ explained Eric Carey, R&D director at Teledyne Dalsa and chair of the GigE Vision committee. ‘Tis is the equivalent of VGA resolution at 370 frames per second in eight-bit, or a one-megapixel camera at 115 frames per second. Tis covers a large range of today’s machine vision market.’ Carey added that, according to the 2013


AIA camera market study, more than half of the machine vision cameras sold use the GigE Vision interface. ‘Tis perfectly illustrates that GigE Vision is the right compromise between performance and cost,’ he said. Some 10GigE products are now available,


although they are not growing at the same pace as their Gigabit counterparts. ‘10GigE over Cat 6 hasn’t been widely adopted since


power is high and the consumer need isn’t there for this bandwidth to bring costs down,’ noted Miethig.


3D vision Te two most important upcoming additions for GigE Vision are support for 3D cameras and the standardisation of a locking connector, according to Carey. ‘Te 3D market is rapidly growing and GigE Vision is a natural interface for this type of data since this standard allows transfer of meta-data,’ he said. Te GigE Vision technical committee is


working with 3D camera companies so that the standard can carry 2.5D and 3D information. Tis requires the addition of new abstract pixel formats to represent real-world units and coordinate systems, such as Cartesian and spherical. Te work is being carried out in combination with the GenICam committee to offer a standardised feature set to control the flow of 3D information. Te locking connector work builds on the


de-facto connector found on many GigE Vision cameras. Te committee aims to define the various dimensions to allow proper mating between the RJ-45 jack at the back of the camera and the cable plug. In terms of how USB3 Vision will find its


place in the machine vision market, Dierks of Basler stated: ‘New mainstream sensors are designed to meet the bandwidth of USB 3.0 (350 MB/s). Terefore USB 3.0 will step at the side of the GigE interface which is currently the key interface in machine vision cameras.


100m (copper); 5,000m (fibre optic)


CAT-5e/6a/7 and fibre


Optional No


USB3 Vision January 2013 400 MB/s


3-5m (passive copper); 8m (active copper); 100m (fibre optic)


USB Yes No


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