H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 84)

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Figure 56 Loopback test result
Configuration guidelines
Note the following when performing a loopback test:
• You can perform an internal loopback test but not an external loopback test on a port that is
physically down, while you can perform neither test on a port that is manually shut down.
• The system does not allow Rate, Duplex, Cable Type and Port Status configuration on a port under
a loopback test.
• An Ethernet port works in full duplex mode when the loopback test is performed, and restores its
original duplex mode after the loopback test.