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What is Power over Link™ (PoL)?
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What is Power over Link™ (PoL)?


Power over Ethernet (PoE) technology has steadily increased in popularity since its introduction, and its adoption is becoming more widespread. However, one of the drawbacks of PoE is distance. The maximum effective length for UTP cable is 100 meters (328 feet). Fiber optic cabling, used in conjunction with PoE-enabled media converters, can overcome the distance limitations of copper cable, but there still exist many applications where it is not practical or economically feasible to use fiber.

What is needed is a system that can deliver power and data together over existing (non-UTP) wiring, one that is suitable for long distance connections, and that can eliminate the need to run power cables to the remote site. Rising to the challenge, EtherWAN developed Power over Link (PoL) technology. PoL allows power and data to be transported over a single pair of wires, and even works using traditional phone lines or coaxial cable. PoL can deliver the power needed (up to 30 Watts) to end devices such as IP cameras, controllers and access points, up to a distance of 1.2 kilometers (0.75 miles).

EtherWAN currently offers three models of Ethernet Extender that support Power over Link: ED3238, ED3538, ED3638

 

pol_how_does_it_work-s_0.jpg
 

How does it work? 


The PoL Ethernet Extenders are used in pairs, with the local extender receiving power from a DC power supply, and transmitting power to the remote extender. The link between the devices runs at full 100Mbps at distances from 180 meters (ED3238), to 1.8 kilometers (ED3638), many times the distance achievable with Cat 6 cable.
Powered devices connected to the remote extender receive power through a normal PoE connection via the Ethernet port.

Power over Link™ (PoL) Enabled

Date Rate Indicators
(Min. Rate)
ED3538T/R
Reference performance
(a pair of 24 AWG copper wires)
ED3638T/R
Reference performance
(RG6 coaxial cable)
Distance PoE Power Output Distance PoE Power Output
100Mbps 300m (984ft.) 30.0W 400m (1312ft.) 30.0W
80Mbps 400m (1312ft.) 15.4W 600m (1968ft.) 15.4W
60Mbps 600m (1968ft.) 14.0W 800m (2624ft.) 15.4W
40Mbps 800m (2624ft.) 9.5W 1200m (3937ft.) 8W
20Mbps 1200m (3937ft.) 5.0W 1600m (5249ft.) 6W

Link
(<20 Mbps)

- - 1800m (5905ft.) 4W

 

This system allows existing cabling infrastructure to be leveraged in modern networks, and provides a way to deliver power to devices in remote locations. The following performance table shows the full capability of Power over Link in terms of data rate and wattage.

The combination of VDSL2 (Very-high-bit-rate digital subscriber line 2) and PoL technology is a powerful tool for system installers and integrator, allowing for networks that are faster, cheaper, and easier to install.


 

 Solution 

ED3238 product_ed3238-s.jpg 10/100BASE-TX IEEE802.3af PoE Ethernet Extender
over Coaxial Cable
ED3538 product_ed3538-s.jpg Hardened 10/100BASE-TX PoL/PoE Ethernet Extender
over Copper Wires
ED3638 product_ed3638-s_0.jpg Hardened 10/100BASE-TX PoL/PoE Ethernet Extender
over Coaxial Cable

 

 Side Product Selections 

EX77000 product_ex77000-s.jpg Hardened Managed 24-port 10/100BASE and 4-port
Gigabit Ethernet Switch with SFP options
EX17162 product_ex17162-s.jpg Web-smart 16-port 10/100BASE-TX PoE and 2-port
combo Gigabit SFP Ethernet Switch
SDR-120-48 product_dd-120-48-s.jpg 120W/2.5A DIN-Rail 48VDC Industrial Power Supply