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5 hubs is the limit because the USB spec only allows USB devices to be addressed 7 tiers deep and the computer and the camera already use 2 tiers themselves.Ģ. This may not be easy to achieve or elegant, but might be a cheap solution if you have a lot of USB hubs sitting around. USB 3 devices can reach 18 meters away (~60 feet). You may use up to (5) USB 2 or 3 (actively powered) hubs placed at even distances between 6 maximum length standard cables to extend your USB 2 camera out as far as 30 meters (96 feet). USB cameras can be successfully placed much farther out than that from the Security Spy computer. Those who are stymied by the maximum cable length limits of USB 2 (5 meters or 16 feet) or USB 3 (3 meters or ~10 feet) need not fear…. Matt Carrell 28 November, 2016 at 4:08 pm.Post navigation ← Network Topology Protecting Yourself from Server Outages →Ģ thoughts on “ USB Cameras and SecuritySpy” This entry was posted in SecuritySpy and tagged bandwidth limitations, system profiler, usb cameras, usb ports, video surveillance system on 4 January, 2012 by Ben Software. Our advice remains: use network cameras, which don’t suffer the same limitations, and are designed for the purpose of video surveillance with typically far superior video quality. Note however that such cards typically have only one bus, and share this bus between all their ports, so it is likely that you will need one PCI card per USB camera.
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If your computer has PCI slots (a Mac Pro for example), you can add extra USB ports using PCI cards. Therefore, in the above example, we have one camera using one high-speed bus, and one USB hard drive using the other high-speed bus. Similarly, if you use an external USB hard drive, this should be on its own high-speed bus for optimum performance. If you were to connect a camera to port 2, it would work poorly, or maybe not at all, because this port is on a USB 1.1 bus.
So, with the above computer, if you wanted to use two USB cameras, you would plug one into port 1 or 5, and the other into port 3 or 4, so that they are on separate high-speed busses. The first two are USB 1.1 busses, which are much slower (useful for bluetooth, keyboards, mice and other low-bandwidth devices only). Note also that only the second two busses are “High-Speed”, i.e.
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Note that there is no way to tell from the above information which busses power which ports! You either have to find out this information online or through trial and error.
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The first bus powers the built-in IR Receiver and USB port number 2 the second bus powers the built-in bluetooth controller the third bus powers USB ports number 3 and 4 and the fourth bus powers USB ports 1 and 5. This computer has five USB ports, and as you can see, it actually has four separate USB busses. The above system report is for a late-2009 Mac Mini. Click the “System Report” button, and locate the USB section on the left side of the window: To see how many busses your Mac has, open the “System Information” app (“System Profiler” on systems before OS X 10.7) from your /Application/Utilities/ folder. On other Macs there may be multiple busses. In some Macs, all the ports share the same bus, and therefore the same bandwidth.
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Therefore, it is not possible to use more than one camera on the same USB bus at full resolution.Īlthough Mac computers typically have more than one built-in USB port, they vary in how many USB busses they have. One USB camera will use most of the bandwidth on a USB bus (this is because USB cameras use uncompressed video, as opposed to network cameras, which use compressed video). Therefore, a USB camera can potentially be a cheap and useful addition to a video surveillance system in certain circumstances. However, we understand that they can be an attractive option in some situations due to their low cost and simple plug-and-play connection to the computer. This is partly due to their general low video quality and short cable length, but also due to bandwidth limitations on the USB bus making it difficult to use multiple USB cameras at the same time.
We typically advise against using USB cameras with SecuritySpy.