网络高清视频监控系统的哪些功能？有什么区别？(2)

2 6、终端设备可以分为产品形式：

1、 IPC（集成网络摄像机）

2、 DVS（不带存储接口的视频服务器）

嵌入式

3、 DVR（具有存储接口的视频服务器）

嵌入式PC架构+板载终端设备可以分为编码方法：

H。 264 \ MPEG4 \ MPEG2 \ M-JPEG

2 7、网络高清视频监控系统的前端设备如何避免雷击？

对于室的环境不会太强的光线。具体选择主要基于照相机与观察对象之间的距离。普通红是20-100米。距离越远，价格越昂贵，功耗也很大。

此内。为了防止电磁感应，摄像机的电源和信号线沿杆的方向应穿过金属管进行屏蔽。信号线传输距离长，耐压水平低。容易产生雷电流并损坏设备。为了将雷电流从信号传输线传输到地面，信号过压保护器必须快速响应，并且在设计信号传输线的保护时必须考虑信号。传输速率，信号电平，启动电压和雷电通量等参数。

2、传输线的防雷

监视系统的传输线主要是传输信号线的电源线。控制信号传输线和警报信号传输线通常使用铜芯屏蔽的柔性线，它们在前端和端子之间竖立（或敷设）。从防雷的角度来看，直埋法具有最佳的防护效果。架空线是最容易遭受雷击的线，它们具有很高的破坏力，作用范围广。 In order to avoid damage to the equipment at the end and the end, overhead lines should be installed on each pole during transmission. For grounding, the suspension wires of overhead cables and the metal pipes in the lines should be grounded. The signal source and power supply at the input end of the intermediate amplifier should be connected to appropriate lightning arresters respectively.

3、 Lightning protection of terminal equipment

In the monitoring system, the lightning protection of the monitoring room is the most important, which should be carried out from various aspects of direct lightning protection, lightning wave intrusion, equipotential connection and surge protection. Since 80% of the high potential of lightning strikes are invaded from the power line, in order to ensure the safety of the equipment, a three-level lightning protection should be set on the general power supply. Before the video transmission line, signal control line, and intrusion alarm signal line enter the front-end equipment or before entering the central console, a corresponding lightning protector should be installed.

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