数据环回测试中断正常网络通讯。
The data loopback test disrupts normal network communication.
适合环回测试电缆的循环后的信号到达终端设备端口。
The fit loopback tests the cable by looping the signal back after it reaches the DTE port.
第二个和第三个环回测试线港口当地DCE和远程终端设备。
The second and third loopbacks test the line ports of the local DCE and the remote DTE.
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