Modern PoE video surveillance can work for all business types. You can find security, reliability and significant cost savings utilizing these technologies.

WHAT IS POE?

Power over Ethernet or PoE technology describes a system to safely transfer electrical power, along with data, to remote devices over standard data cables in an Ethernet network (Cat3/Cat5/Cat5e/Cat6).

Power is remotely supplied from a central location (e.g. wiring closet) for distances under 100 meters without the Ethernet devices having to be individually powered by an AC outlet.

NameIEEE StandardPower to Powered Device (PD)Max. Power per PortEnergized Pairs
PoEIEEE 802.3af12.95W15.4W2-pair
PoE+IEEE 802.3at25.5W30W2-pair
PoE++IEEE 802.3bt (Type 3)51W60W4-pair
PoE++IEEE 802.3bt (Type 4)71.3W100W4-pair

HOW DOES IT WORKS?

Power is remotely supplied from a central location (e.g. wiring closet) for distances under 100 meters without the Ethernet devices having to be individually powered by an AC outlet.

The original IEEE 802.3af-2003 standard version of PoE supplies up to 15.4 W of DC power (minimum 44 VDC and 350 mA) to each device. Only 12.95 W is assured to be available at the powered device (PD) as some power is dissipated in the cable.

Ethernet cable that meets CATx standards consists of four twisted pairs of cable, and PoE sends power over these pairs to PoE-enabled devices. First PoE standards use two twisted pairs to transmit data, while the remaining two pairs are used for power transmission. With the new PoE standards, power and data are both sent over all four twisted pairs.

When the same pairs are used for both power and data, the power and data transmissions don’t interfere with each other. That’s because electricity and data are transported at opposite ends of the frequency spectrum. Electricity has a low frequency of 60 Hz or less, and data transmissions have frequencies that can range from 10 million to 100 million Hz.

INTRODUCING THE 802.3BT POE STANDARD

To meet the demand for higher power, the IEEE released a new PoE standard at the end of 2018, to significantly increase capacity. IEEE 802.3bt allows for up to 60 W to 100 W of power at the source by providing power over four pairs of wires (compared to the previous technology’s ability to power over just two pairs). This increase in power allows you to use PoE for a greater range devices and applications. As an added benefit, the new standard will boost energy efficiency by minimizing power loss in the cable, potentially cutting power loss in half.

The new standard will include support for 2.5GBASE-T, 5GBASE-T and 10GBASE-T, while existing standards have a maximum speed of 1-Gbps. This new support will create intermediate data speeds between existing standards.

WHAT ARE THE BENEFITS OF POE?

Time And Cost Savings

Installation Cost Savings, including eliminates the need for electrical outlet installation, dramatically reduces cost of deployment, savings up to $1,000 per PD, No need for bulky AC power adaptors. Use one set of twisted-pair wires for both data and low-wattage appliances.

Safety

POE systems employ fault protection to prevent any possibility of damage to the equipment in the event of a malfunction. This feature shuts off the power supply if excessive current or a short circuit is detected. Power mains are eliminated. Centralized power management allows for devices to be remotely powered down during periods of low usage or for security purposes.

Reliability

POE was been widely deployed over the years to provide power to various evolution in the enterprise workspace environment. Centralized power backup enables continuous operation during power interruptions. If your LAN is protected from power failure by a UPS, the PoE devices connected to your LAN are also protected from power failure.

Scalability

Apart from backup, as the enterprise workspace evolves with more and more communication devices, POE is also coping through evolving to support newer devices with increased power requirements which promise collaboration, safety, productivity and support. It can continue to handle a growing amount of work and is capable of a system network. PoE also works well for video surveillance, building management, retail video kiosks, smart signs, vending machines, and retail point-of-information systems.

APPLICATIONS OF POE

Voice and Video IP Phones

IP Network Security Cameras, Enclosures, Heaters, PTZ

WiFi Wireless Access Points

Access Control, SIP IP Paging, Door Locks, Gateways

Digital And School Clocks, Gas And Fire Alarms, Digital Signs

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Sources And Additional Information:
https://www.ieee.li/pdf/viewgraphs/introduction_to_poe_802.3af_802.3at.pdf

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