Can I Mix Poe And Wireless Cameras
Since the rapid development of network video surveillance, technical barriers are getting higher and higher, manufacturers offering technical support is also becoming comprehensive and systematic. Tom is a sales representative in video surveillance industry for several years, everyday exchanges ideas with security integrators. In the exchange of technology, integrators and installers often feel confused on Ability over Ethernet (PoE) issues, Tom feel the importance of PoE technology, herein, Tom invited a PoE expert to provide comprehensive information nearly PoE.
#1 What's Ability over Ethernet (PoE)?
PoE stands for Power over Ethernet, it's a engineering science that transmits both data and power supply simultaneously to network devices (such as VoIP phones, Wireless AP, network camera etc) without changing existing Cat.5 cable network structure. PoE allows you to supply power to a networking device using the aforementioned cable that transmits the data, which in turn, greatly reduce the price of installation and maintenance.
A complete PoE system includes Power Sourcing Equipment (PSE) and Powered Device (PD) two parts.
Power Sourcing Equipment (PSE): The equipment supports PoE function such as PoE switch, PoE injector (midspan) etc.
Powered Device (PD): IP/network cameras in video surveillance arrangement.
Notation: Currently, PoE engineering science has two standards - IEEE802.3af and IEEE802.3at.
#2 Is PoE engineering reliable?
On technical perspective, PoE technology has been developed for many years, now PoE applied science is in mature stage. However, current video surveillance market place faces cost pressure level, the quality of selected PoE switch and Cat5 cable is too poor, or the project design is unreasonable, may result in the maintenance workload of PoE project is huge, and then integrators hold the common view that PoE technology is not stable.
For network video surveillance projects, different from common network cabling, data transmission is huge, power consumption is high, additionally requires 24/seven days continuous working, choosing high quality PoE device and cable tin can ensure the reliability of system.
#iii What's the advantage of PoE?
1. Uncomplicated cabling, reduce installation cost
Centralized power supply, one network cablevision tin transmit information and power supply, PoE enables network devices no longer require extra power supply, greatly reduce the installation cost and time.
2. Condom and convenient
Power Sourcing Equipment merely provides power supply to PoE-enabled devices. For example, PoE switch only transmit power supply when it detects the connection of PoE-enabled devices. This can avert the adventure of leakage. Users can mix utilize existing non-PoE device and PoE-enabled devices, both of them can co-exist.
three. Convenient for maintenance
Like to data manual, PoE tin be managed through Uncomplicated Network Management Protocol (SNMP). This office tin can offer shut downward at night, remote reset etc functions.
Simple Network Management Protocol (SNMP) is a popular protocol for network management. Information technology is used for collecting information from, and configuring, network devices, such as servers, printers, hubs, switches, and routers on an Internet Protocol (IP) network.
#iv Possible problems or disadvantages of PoE?
1. Power insufficient, powered device can't boot: 802.3af PoE standard maximum output power is below xv.4W, this is sufficient to provide ability supply for about of IP cameras. However, this output power is not sufficient for loftier power consumption devices such equally network PTZ camera.
2. Centralized risk: Mostly, a PoE switch connects to multiple IP cameras, if PoE network switch encounters any issues, all IP cameras volition stop working.
3. High equipment and maintenance cost: Compared to other power supplying methods, PoE technology increases maintenance workload, when considering security and stability, divide power supply is all-time.
#5 How to select PoE switch?
1. Power consumption of IP camera: PoE network switch adopts unlike standards, the output ability is also unlike. For example, IEEE802.3af tin support powered devices that don't exceed xv.4W. As cablevision transmission will consume power, IEEE802.3af can provide power supply to powered devices that don't exceed 12.95W. According to IEEE802.3at standard, IEEE802.3at PoE switch tin work with powered devices that don't exceed 25W.
2. Max. support powered devices: PoE switch has an of import parameter - total power. Under IEEE802.3af standard, If 24CH PoE switch'due south total power reaches 370W, so each ports can get sufficient power (370/fifteen.4=24), merely if based on IEE802.3at standard, each port supports 30W, the PoE switch merely can provide power supply to 12 ports (370/xxx=12).
iii. Required quantity of ports, whether having Optical Fiber port, or network management, bandwidth (10/100/1000M).
#6 What's the PoE transmission range? advice on selecting cablevision?
PoE transmission range is 100 meters, recommend to use Cat5 Ethernet cable.
You lot should be cautious when ownership the Ethernet cable from Communist china. PoE IEEE802.3af standard requires PSE output power is 15.4W, later 100 meters transmission, the PD can receive 12.95W power, according to 802.3af standard electric current value - 350ma to calculate, the resistance value of 100 meters Ethernet cablevision should be (15.four-12.95W)/350ma = vii Ohm or (15.v-12.95)/350ma = 7.29 Ohm.
Obviously, standard Cat5 cable tin can encounter this requirement. only in that location are many not-standard Ethernet network cables selling in the market, they are produced not strictly in accord with the requirements of the standard network cable. Not-standard network cable utilizes other materials such every bit copper clad steel, copper clad aluminum, copper coated iron, etc. The resistance of these cables is big, not suitable for POE power supply. POE power supply must employ oxygen-gratuitous copper fabric, namely, the standard network cablevision.
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Source: https://www.unifore.net/ip-video-surveillance/6-things-you-should-know-about-power-over-ethernet-poe.html
Posted by: burnhamromay1946.blogspot.com
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