安防监控工程中的三大供电方式如何选择？

How to choose the three power supply modes in the security monitoring project?

视频监控工程中，需要考虑摄像机的供电方式，用什么供电方式能达到最佳监控效果？如何最大程度的节约工程成本?首先就需要了解一下视频监控工程中摄像机供电的几种方式。

In the video surveillance project, the power supply mode of the camera should be considered. What power supply mode can be used to achieve the best monitoring effect? How to save the cost of the project to the greatest extent? First, we need to know several ways of the camera power supply in the video surveillance project.

一、集中供电

1. Centralized power supply

集中供电指的是将源设备集中安装在电力室和电池室，电能经统一变换分配后向各通信设备供电的方式。

Centralized power supply means the centralized installation of the source equipment in the power room and battery room, and the power supply to all communication devices after unified transformation and distribution.

集中电源供电：在220V电源处接12V集中电源一个，再用2*1.0红黑电源线分别接给摄像头，12V供电距离不可超过100米。在接个单个电源线接头，再把单个电源线接头和监控摄像头电源接头相连接即可。集中供电方式是指在监控室或某个中间点采用12V开关电源向前端负载集中供电。

Centralized power supply: at the 220V power point, a 12V centralized power supply is supplied, then the 2*1.0 red black power line is connected to the camera, and the 12V power supply distance can not exceed 100 meters. Connect a single power cord connector and connect the single power cord connector to the power adapter of the monitoring camera. Centralized power supply means that the 12V switch power supply is concentrated on the front end of the monitoring room or an intermediate point.

集中监控的作用

The role of centralized monitoring

数据中心的管理对象主要包括基础设施与IT基础架构两大部分，如配电、网络设备、安保等，集中监控的目的就是要能够通过管理与技术的应用，对基础设施与IT基础架构的运行情况进行监视，实现故障与异常的实时发现与通知;此外还可以通过对监控数据搜集与整理，为容量管理、事件管理、问题管理、符合性管理提供分析的基础，最终实现数据中心高可用性的目标。

The management object of data center mainly includes two parts of infrastructure and IT infrastructure, such as distribution, network equipment, security and so on. The purpose of centralized monitoring is to monitor the operation of infrastructure and IT infrastructure through management and technology application, and realize real time discovery and notification of fault and anomaly. In addition, we can also collect and collate monitoring data, provide the basis for capacity management, event management, problem management and compliance management, and finally achieve the goal of high availability of the data center.

优点：施工较方便，便于维护，统一控制和管理。

Advantages: convenient construction, easy maintenance, unified control and management.

缺点：前期配置复杂，直流低压供电传输距离过远电压损耗高，传输过程中抗干扰能力差。

Disadvantages: early stage configuration is complex, DC low voltage power supply transmission distance is too far, high voltage loss, poor anti-interference ability in transmission process.

二、点对点供电

Two. Point to point power supply

点对点供电：是指从监控室直接引出220V交流电，在摄像机旁边接一个单独DC12V电源，再接在监控摄像头上，安装好支架即可。

Point to point power supply: it refers to the direct 220V AC power from the monitoring room, a single DC12V power supply next to the camera, then on the monitoring camera, and the installation of a good support.

优点：220V交流电在传输过程中电压损耗低，抗干扰能力强。

Advantages: 220V AC has low voltage loss and strong anti-interference capability during transmission.

缺点：每个点都要安装一个电源，施工较麻烦。

Disadvantages: every point must be installed with a power supply, and construction is more troublesome.

三、PoE供电

Three, PoE power supply

PoE供电指的是在现有的以太网Cat.5布线基础架构不作任何改动的情况下为其他设备提供直流供电的技术，该方式主要应用于高清网络数字监控系统。

PoE power supply refers to the technology that provides DC power supply for other devices without any changes in the existing Ethernet Cat.5 wiring infrastructure, which is mainly used in the high-definition network digital monitoring system.

优点：降低成本，部署灵活，方便快捷，美观漂亮，单端口最大功率可达30W。

Advantages: reduce cost, flexible deployment, convenient and quick, beautiful and beautiful, single port maximum power up to 30W.

缺点：对网线质量要求较高，传输距离有限，受电设备功率不能超过30W。

Disadvantages: the quality requirements of the cable are high, the transmission distance is limited, and the power of the receiving equipment can not exceed 30W.