PoE over coax? What is PoE first?

Power over Ethernet (PoE) enables Ethernet cables like Cat 5e/Cat 6 to transmit electric power and data signal at the same time, meaning plug in an Ethernet cable, and no other power cable is needed.

So PoE over coax is “power over ethernet over coax”?

Yes. From its name you can see it has two major aspects: 

• Ethernet over coax

• Power over coax

Run ethernet and power simultaneously over coax

Ethernet over coax

Ethernet started off using coaxial cable, which was called ThickNet. It could run at 10 Mbps over 500m of coaxial cable. Therefore, it was also named 10Base5.

But it was too thick, making it difficult to install. So the Thinnet came out. It was thinner and cheaper, but at the cost of having its operating distance reduced to 200 meters. Therefore, it has the name 10Base2.

Eventually, people found the thinnet was still cumbersome. Then the savior twisted pair was born. It’s even thinner and cheaper, and still offers a high speed of 10 Mbps, but only over a distance of 100m. It has the name 10Base-T. T stands for twisted pair.

Over time, the twisted pair has evolved into 100Base-T and 1000Base-T. Among them, 100Base-T is known as Fast Ethernet and is super widely used.  

However,  compared to twisted pairs, coax has higher bandwidth, lower noise and signal loss, and greater transmission distances. Coax can transmit 80 times more data than twisted pair. 

Coaxial cable is generally preferred over twisted pair cabling for business usage, while twisted pair can be used for internal networks because of its low cost and easy installation.

If you have coax wired all over your place, then you’re very lucky because you only need coax to ethernet adapters to reuse these powerful old wires. 

Power over coax

Our adapters are not simple RJ45 to BNC port converters. It incorporated advanced coding modulation to put the data in the high frequency band and separate it from the power supply noise in the low frequency band.  

In the original analog system, it is impossible to realize coaxial power supply because the frequency of the data signal is too low, and it is interfered by the noise of low frequency power signal. 

By placing the data in the high frequency band, we not only achieved ethernet & power over coax at the same time but also make the 100Mbps data transmission rate achievable. 

With common mode extraction, high and low frequency division, and impedance transformation techniques, we implemented a flawless PoE system to coax data and power transition.  

LIONVISION PoE over coax adapters, your clean, cost-effective choice for surveillance system upgradation.