PoE(Power Over Ethernet)

Term to describe standards which enables data and electricity to be transmitted over twisted paired Ethernet cables.  This allows single cable to provide connections of data/electricity to remote Wireless AP, IP surveillance cameras and etc.  

Compares to standards like USB, which provides data and power to peripherals as well but with limited distance and available power output; PoE standard allows bigger power output, and longer cable distance.

Therefore, as safety and security demand increases, PoE technology becomes an ideal solutions for IP Surveillance deployments for both business and industrial environments.  The flexibility and convenience of PoE equipment provide the best bang-for-the-buck solution to quickly and securely solve your data and power connectivity needs! 

Standard Power over Ethernet is a technology which enables electrical power to pass over Ethernet cabling at distances up to 100m, it is designed to provide end devices with sufficient power to operate with no need for a local power source.

Alternative LR PoE solution is also available to exceed 100m range for a more extreme construction site.

A PoE system is typically consisted of four pieces of equipment:

(1) Power Sourcing Equipment (PSE)

PSE is a device which supplies power to the rest of the system. It will draw power from its own conventional power source and provide power to the rest of the PoE system.

(2) Powered Device (PD)

PD is a device which receives power from the PSE device. It does not require its own conventional power source.

(3) Ethernet cable

         The Ethernet cable is the power and data transmission medium of a PoE system. It is used to provide the link    between two devices enabling bi-directional communication and uni-directional supply of power.  

(4) Power Supply

         There must be a power source from which the PSE draws power. Typically a PoE system is powered by a nominal 48VDC power source. 

 

Advantages of PoE

  • Convenient Network Design
    With a PoE system, you don’t need to compromise on the placement of equipment due to the location of the power outlet.  PoE ready PD can be placed with the reachable distance of the Ethernet cable.

  • Simple & Cost Effective installations
    The installation is simpler because the numbers of power adapters needed can be greatly reduced. 

  • Central power management
    In a PoE system you can distribute power and data in many different ways. One possibility is to distribute power and data from a central location in a star topology, this allows for central power management which can be backed up by a redundant power supply such a uninterruptible power supply (UPS).

    In industrial networks, mesh or ring topologies are typically adopted; these use managed switches to provide efficient traffic management. Many managed switches on the market today that support PoE can be used to remotely manage the power supplied to end devices, resetting the power if an end device is not responding, or time scheduling the power so that energy can be saved when the functionality of the end device is not required.