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Alvium USB Cameras User Guide V3.6.4
Performance and troubleshooting
Vimba 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 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 MBps are
required to reach maximum frame rates for some Alvium USB camera models.
Adding the typical overhead for USB communication, even 500 MBps can be
insufficient. We recommend using roughly
1 GBps per camera
.
In
Table 111
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
250MB/s
500MB/s
0.99/GB/s
× 2
500MB/s
1GB/s
1.97GB/s
× 4
1GB/s
2GB/s
3.9GB/s
Table 111: Requirements for USB PCIe host adapters
Suitable USB 3.0 accessories
www.alliedvision.com/en/products/accessories
Gen 1 host controller cards and cables or contact your Allied Vision Sales
representative.
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