what is poe and their max distance

distance of poe cables

Power over Ethernet (PoE) is a technique that allows network connections to transport electrical power to devices such as IP phones, wireless access points, and cameras. PoE removes the need for separate power cords, simplifying installation and lowering expenses.

PoE works by injecting DC power into Ethernet connections alongside the data, using unused wire pairs in the cable. Power is supplied via a PoE-enabled network switch or a PoE injector positioned between the switch and the powered device. To receive power via the Ethernet wire, the powered device must be PoE compliant.

There are many PoE standards, including IEEE 802.3af (PoE), IEEE 802.3at (PoE+), and IEEE 802.3bt (PoE++). Each standard delivers varying quantities of power via the Ethernet wire, with PoE++ being the most recent and powerful.

PoE is a handy and cost-effective solution to power network devices, particularly in situations where installing electrical outlets is difficult or impracticable.

Distance of POE

The greatest distance that Power over Ethernet (PoE) may travel is dependent on a number of different factors, such as the type of Power over Ethernet standard that is being used, the quality of the cable, and the power requirements of the device that is being powered.

The longest distance that a Power over Ethernet (PoE) connection may travel is often set at 100 meters (328 feet) for both the PoE and PoE+ standards, which are the two types of PoE standards that are utilized the most. Nonetheless, this distance may change depending on aspects such as the quality of the cable, the temperature, and other aspects of the surrounding environment.

There are also more recent PoE standards, such as PoE++ (IEEE 802.3bt), which can give higher power levels and may need shorter lengths owing to the power loss that occurs over longer distances. It is important to take note of these newer PoE standards. In order to establish the maximum distance for a PoE connection, it is generally recommended to examine the manufacturer’s specifications for the particular PoE devices and cabling that are being used in the installation.

Professional POE switches for IP security cameras can reach up to 820 feet (250 meters) on bare copper cable Out switches and NVR gives you the capability of reaching that distance to communicate with IP security cameras, not for networking.

POE vs POE+ vs POE++

Power over Ethernet (PoE), Power over Ethernet Plus (PoE+), and Power over Ethernet Plus (PoE++) are all distinct protocols for supplying power to network devices through Ethernet connections. The following is a rundown of the primary distinctions between these standards:


The first version of the PoE standard, also known as IEEE 802.3af, delivers up to 15.4 watts of power to a powered device (PD) through a Category 5 (Cat5) Ethernet connection. PoE is an abbreviation for Power over Ethernet. This provides an adequate amount of power for IP phones, access points, and cameras.


PoE+, which is often referred to as IEEE 802.3at, transmits up to 30 watts of power across the course of a Cat5 Ethernet connection. This standard was developed to assist devices that require greater power, such as pan-tilt-zoom cameras and video phones. Specifically, it was developed to meet the demands of these devices.


Cat5 Ethernet cables can transmit up to 60 watts of electricity using the most recent Power over Ethernet (PoE) standard, which is also known as IEEE 802.3bt. This standard was developed to provide compatibility for more power-hungry devices, such as 4K video displays, thin clients, and building automation systems.

PoE TypeType 1Type 2Type 3,4
Switch Port Power
Maximum Port Power15.4 W30W60W, 100W
Port Voltage Range44-57V50-57V52-57V
Powered Device Power
Voltage Range to Device37-57V42.5-57V42.5-57V, 41.1-57V
Max Power to Device12.95W25.5W51W, 71W
Twisted Pairs Used2-pair2-pair2 Pair or 4 Pair, 4 Pair
Cable Types SupportedCat3/Cat 5Cat5Cat 5, Cat 5
IEEE Standards
IEEE StandardIEEE 802.3afIEEE 802.3atIEEE 802.3bt, IEEE 802.3bt

In conclusion, Power over Ethernet (PoE), Power over Ethernet Plus (PoE+), and Power over Ethernet Plus (PoE++) all differ in the amount of power that they deliver via Ethernet connections. PoE is enough for use with simple devices, however, PoE+ and PoE++ are essential for use with devices that demand increased power. It is essential to check that all of your network equipment is compatible with the appropriate PoE standard in order to prevent any compatibility problems.



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