Modern CXP-12 cameras can transmit up to 12.5 Gb\/s per CoaXPress link, while multi-link camera configurations can combine multiple links to increase the available interface bandwidth. A four-link CXP-12 configuration provides up to 50 Gb\/s of aggregate interface bandwidth, while higher-link-count acquisition architectures can scale further.<\/p>\n
Selecting the correct CoaXPress camera therefore involves more than resolution and frame rate. Engineers must also consider the required number of CXP links, pixel depth, sensor architecture, triggering requirements, cable distance, frame grabber connectivity, host bandwidth, and downstream image-processing requirements.<\/p>\n
When Is CoaXPress the Right Camera Interface?<\/h2>\n
CoaXPress is particularly well suited to imaging systems that require very high deterministic point-to-point bandwidth, precise triggering, and scalable multi-link acquisition. CXP-12 provides up to 12.5 Gb\/s per link, allowing one-, two-, and four-link cameras to scale according to the required image-data rate. The interface is especially attractive for high-resolution area-scan cameras, high-speed line-scan cameras, synchronized imaging, and applications where predictable transfer and direct frame-grabber connectivity are critical. For systems that prioritize standard Ethernet infrastructure, switched networking, or substantially longer distributed connections, another camera interface may be more appropriate.<\/p>\n
Understanding CXP Cameras<\/h2>\n
CoaXPress, commonly abbreviated CXP, is a point-to-point high-speed imaging interface that transmits data over standard coaxial cable. Often referred to simply as a CoaXPress cable or CXP cable, this single connection provides a high-speed downlink from camera to acquisition hardware together with a lower-speed control uplink, precise triggering, and optional Power over CoaXPress (PoCXP). The standard also supports GenICam-based camera control.<\/p>\n
The Japan Industrial Imaging Association (JIIA)<\/a> plays an important role in the development and standardization of CoaXPress. Its CoaXPress Working Group develops technical specifications and documentation, manages conformance and interoperability testing, and maintains a registration program for CoaXPress-compliant cameras, frame grabbers, cables, and related products.<\/p>\n A key advantage of CoaXPress is scalability. A camera may use a single CXP connection or combine multiple links when the sensor produces more image data than one link can carry.<\/p>\n CoaXPress cameras may operate at different link speeds, including CoaXPress-6 cameras (CXP-6 cameras) and CoaXPress-12 cameras (CXP-12 cameras), depending on the camera generation, required bandwidth, and acquisition architecture.<\/p>\n Typical considerations include:<\/strong><\/p>\n Current CoaXPress camera portfolios include both area-scan and line-scan models. For example, commercially available CXP-12 line-scan cameras include 8K and 16K sensors, while area-scan families range from relatively low resolutions to tens or even more than 100 megapixels.<\/p>\n Select the CoaXPress camera according to the complete imaging workload, not interface speed alone.<\/p>\n Resolution and Sensor Format<\/strong><\/p>\n Higher-resolution sensors capture more spatial detail but generate larger image payloads. The optical format and lens must also match the sensor size and required field of view.<\/p>\n Global vs. Rolling Shutter<\/strong><\/p>\n Global-shutter cameras expose the complete image simultaneously and generally suit fast-moving objects and precision measurement. Rolling-shutter sensors may provide advantages in resolution, sensitivity, cost, or sensor availability, but motion artifacts must be considered for dynamic scenes.<\/p>\n Frame Rate<\/strong><\/p>\n Higher frame rates directly increase the required data bandwidth. A camera that can operate at a high nominal frame rate may therefore require multiple CXP-12 links to transmit uncompressed image data at full performance.<\/p>\n Pixel Depth and Image Format<\/strong><\/p>\n 8-, 10-, 12-, or higher-bit pixel formats affect image quality, dynamic range, and data rate. Color cameras may also increase the data volume depending on the transmitted pixel representation.<\/p>\n Link Count<\/strong><\/p>\n A critical design parameter is whether the camera uses one, two, or four CoaXPress links, while higher-link-count acquisition architectures can scale further when required. The acquisition platform must provide enough compatible CXP connections for the camera configuration.<\/p>\n Triggering and Synchronization<\/strong><\/p>\n Applications involving multiple cameras, moving objects, metrology, 3D reconstruction, or line-scan acquisition often require deterministic trigger timing and precise synchronization between sensors.<\/p>\n Acquisition and Processing Architecture<\/strong><\/p>\n The camera is only one part of the data path. The frame grabber, FPGA, PCIe interface, host memory, storage subsystem, GPU, and processing pipeline must all sustain the actual image-data rate.<\/p>\n Systems that prioritize long cable reach, standard Ethernet infrastructure, or switched multi-camera networking may instead evaluate switched-network GigE Vision cameras<\/a>.<\/p>\n High-resolution and high-speed CoaXPress cameras can generate extremely large continuous image streams, particularly in multi-link CXP-12 configurations. The required CXP link speed and link count should therefore be evaluated against resolution, frame rate, pixel depth, and camera count.<\/p>\n The required acquisition bandwidth can be estimated from four primary factors:<\/p>\n Resolution \u00d7 frame rate \u00d7 pixel depth \u00d7 number of cameras = required image-data bandwidth<\/strong><\/p>\n For example, increasing resolution without changing frame rate increases the amount of data in every frame. Increasing frame rate raises the number of frames transmitted each second. Increasing pixel depth further increases the amount of data per pixel. A multi-camera system multiplies those requirements again.<\/p>\n This is why engineers should never evaluate a camera specification independently of the acquisition architecture.<\/p>\n Modern CXP-12 cameras span a wide range of possible designs, from compact single-link configurations to multi-link architectures supporting very high resolutions and frame rates. Four-link CXP-12 cameras can provide up to 50 Gb\/s of aggregate interface bandwidth, while higher-link-count acquisition architectures can scale further when required.<\/p>\n For high-resolution or high-speed applications, the frame grabber and downstream processing system must sustain the required data flow without introducing frame loss, excessive latency, or host-side processing bottlenecks.<\/p>\n CXP-12 is the high-speed mode associated with CoaXPress 2.0 and supports up to 12.5 Gb\/s per link<\/strong>.<\/p>\n\n
CoaXPress Camera Selection Criteria<\/h2>\n
Evaluating Bandwidth for High-Resolution and High-Speed Imaging<\/h2>\n
CXP-12 Camera Configurations and Multi-Link Bandwidth<\/h2>\n
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