相反，AAL功能是由在UNI用户侧的用户网络终端设备实现的。

Rather, AAL functions are performed by the user's network terminating equipment on the user side of the UNI.

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在接入网环境下，用户、接入设备和网络都面临着各种威胁，特别是来自用户侧的威胁。

In an open access scenario, users, access equipments and networks are confronted with all kinds of threats and challenges, especially those from users' ends.

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