Traditionally clocks built into cameras are reset when the power is switched on, and the time stamps asynchronously commence a count-up. For networked cameras, these time stamps gradually go out of synchronization as time passes owing to discrepancies in the clocks' frequencies. IEEE1588 is a protocol stipulated by the Precision Time Protocol (PTP) and is in effect for equipment connected together by Ether-net. It synchronizes the time with extremely high levels of precision in cameras that are connected via an Ethernet cable to a "Grand Master" standard time clock.
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机译：传统上，摄像机的内置时钟会在打开电源时重置，并且时间戳会异步开始递增计数。对于网络摄像机，由于时钟频率差异，随着时间的流逝，这些时间戳会逐渐失去同步。 IEEE1588是精确时间协议（PTP）规定的协议，对通过以太网连接在一起的设备有效。它可以通过以太网电缆将摄像机的时间以极高的精度进行同步，该摄像机通过以太网电缆连接到“ Grand Master”标准时钟。
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