字符您看到应该会出现在该终端窗口…祝贺您，您刚才提出了“环回线”，你得到了引脚分配正确的。
The characters which you see should appear back in the terminal window... Congratulations, you have just made a "loop back cable", and you have got the pin assignments correct.
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.
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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