在自动配置协议广泛流传开来之前，人们有时会手工配置计算机系统，以改用全双工操作，但另一台计算机依然会使用半双工操作。

Before the autonegotiation protocol was widely used, people would sometimes manually configure one system to use full duplex, but the other would use half duplex.

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例如，当位置服务是关闭时，人们依然还是可以使用地图服务的，但他们想获取或者是跟踪他们当前的位置的时候，他们将会看到一个提醒。

For example, people can use Maps when location Services is off, but they see the alert when they access the feature that finds and tracks their current location.

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但是，信息采集系统的构建依然存在问题，实际使用方面也没有达到人们的预期。

However, some flaws underlie in the system construction and the performance could not meet specific requirements completely.

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