USB Ports
You can access two USB ports from the front of the server and two USB ports from the rear of the server. The USB ports support hot-plugging. You can connect and disconnect USB cables and peripheral devices while the server is running, without affecting server operations.
The maximum USB cable length for connecting to the server's front USB 2.0 ports is 5 meters (16.4 ft).
The maximum USB cable length for connecting to the rear USB 3.0 ports is 1.8 meters (6 ft). When more than 1.8 meters (6 ft) of cable is needed, you must use an USB 3.0 Hub.
Note - You can connect up to 126 devices to each of the four USB controllers (two ports in front, two ports in rear), for a total of 504 USB devices per server.
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