Allied Vision Alvium Series - Vimba X settings; Requirements for USB PCIe cards and host controllers; Potential limitations with 4-port cards

307Alvium USB Cameras User Guide V4.6.1
Performance and troubleshooting
Vimba X settings
During freerun, Alvium cameras do not automatically adapt the frame rate to the
USB controller's limits. If the data rate is too high for your USB controller, it receives
corrupted frames. The image transfer status in Vimba X Viewer is signaled as
Running. However, the corrupted frames are not displayed.
Requirements for USB PCIe cards and host controllers
Ensure sufficient bandwidth is supported by the USB host adapter cards and by the
corresponding USB PCIe host controllers on your host system. 450 MByte/s are
required to reach maximum frame rates for some Alvium USB camera models.
Adding the typical overhead for USB communication, even 500 MByte/s can be
insufficient. We recommend using roughly 1 GByte/s per camera.
In Table 157
you can see that, for example, Version 1.1 PCIe host controllers with 1
lane do not support the bandwidth required to operate a single camera at full
performance.
Potential limitations with 4-port cards
Observe that some 4-port PCIe cards have limitations: They use shared resources
and do not support the required bandwidth when each port is used.
Lanes ↓ Throughput
PCIe version → 1.0 / 1.1 2.0 / 2.1 3.0 / 3.1
× 1 250 MByte/s 500 MByte/s 0.99 GByte/s
× 2 500 MByte/s 1 GByte/s 1.97 GByte/s
× 4 1 GByte/s 2 GByte/s 3.9 GByte/s
Table 157: Requirements for USB PCIe host adapters
Suitable USB 3.0 accessories
See www.alliedvision.com/en/products/accessories for suitable USB 3.0 or 3.1
Gen 1 host controller cards and cables or contact your Allied Vision Sales
representative.
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