Vision networks expand
Link aggregation only boosts speeds to 2 Gbps, which is a big enough jump in data rates for some uses.
By Ann R. Thryft, Contributing Technical Editor -- Test & Measurement World, 8/1/2010 12:00:00 AM
The networking capability that GigE Vision has brought to vision and inspection systems is giving integrators and system designers more variety and flexibility in how they design applications, not merely in how they connect components.
When I wrote about GigE Vision trends nearly two years ago, most of the discussion centered on coping with Ethernet's latency and CPU utilization issues while preserving image quality and data rates. This time, concerns were fewer and enthusiasm was high about the standard's networking potential (see GigE Vision boosts inspection networks ). Some of this enthusiasm is caused by the GigE Vision spec's recent 1.2 update that supports nonstreaming devices, thus expanding the number and type of components that can be networked, controlled, and managed—and consequently better integrated—in a single vision application.
But some of the excitement comes from recent efforts to expand bandwidth above 1 Gbps, either using link aggregation or by running 10 GigE over GigE Vision. Link aggregation only boosts speeds to 2 Gbps, which is a big enough jump in data rates for some uses. Although 10 GigE is still a ways off for vision, in some inspection applications, such as flat-panel displays, its use may be well worth the implementation challenges involved.
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