MAY 21, 2018 — The next generation of CXP, CoaXPress 2.0 has been announced by Bitflow. The first certified products of CoaXPress 2.0 are expected in 2018. Central to this updated standard is the speed to achieve fast frame rates and larger camera resolutions. CoaXPress 2.0 extends data transfer rates to a 10 Gbit/s (CXP-10) and 12.5 Gbit/s (CXP-12) per connection from the existing standard’s 6.25 Gbit/s maximum data transfer rate support.
With two cables and CXP-12 connections, maximum data transfer rate is 25 Gbps, or 2.5 GByte/s. That will operate a 10-bit 12-megapixel area-scan sensor at more than 150 images per second, or an 8-bit 16k line-scan sensor at 150 thousand lines/s. Because the amount of data may exceed the host PC’s processing power, CoaXPress 2.0 supports the distributing of camera data to several PCs in parallel, permitting them to delegate the workload. Uplink speed is doubled for both CXP-10 and CXP-12, making it possible for trigger rates exceeding 500kHz without a dedicated high speed uplink cable.
One of the biggest challenges in developing CoaXPress 2.0 requirements was doubling the bandwidth yet maintaining its support of long coaxial cable runs. The 12.5 Gbps bandwidth does not limit CXP’s 100-meter cable length, as was the case with other high transfer speed standards, such as USB3 that relies on passive cable lengths of two meters or less. CoaXPress 2.0 perserves the 100-meter maximum length without deploying repeaters that can negatively impact signal integrity.
In recognition of the global trend and increasing adoption of 3D vision techniques, CoaXPress 2.0 has extensions for 3D imaging.
Another new feature to CoaXPress 2.0 is Forward Error Correction or FEC. FEC is a way to control errors in data transmission from the camera to the frame grabber. This is achieved by the camera sending redundant data and the frame grabber recognizing only that portion that conforms to protocol. FEC does not require handshaking between a camera and frame grabber, so data can be sent to many PCs for processing simultaneously from a single camera.