通过对算法实现步骤的分析，发现这两种算法实现时需要传递大量的控制信息，以及不能区分不同速率端口的接入。

By analyzing the algorithms' steps, we found that the two algorithms need to pass a lot of control information and cannot distinguish between different rates ports.

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文中具体分析了各种信号是怎样传递信息的，传递的是什么信息以及公司应怎样选择各种不同的信号装置。

It particularly analyzes how the signals transfer information, what information they transfer, and how the corporates select different signal mechanism.

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