My Company new Wireless Service Provider
Last month, my company have a sign contract with a new Wireless Service Provider, at beginning of this month the New Service Provider has start their installation work such as lay trunking, UTP Cat-5 cable, switches, access point(AP) along the whole building.

How many APs install?
In this building, there are 19th floor and each floor some has maximum 3 Access Point (AP) and some has minimum 2 Access Point (AP), on the function room’s floor, there was 5 APs, and 6 APs at the lobby and Cafe. Approximate 50s APs in the whole building.

How the AP Operate?
All the AP need power to operate, they install those APs on top of the celling along corridor; it is hard to provide electric on the celling, engineering people need to lay power cable, sure will bring a lot of trouble to them. So how the APs going to function without electric point nearby?

With Using POE (Power Over Ethernet) function
I never heard before POE, and never heard before this concept, it is awesome when I understand this POE after googling it. The i also realise how our home telephone set no need power also able to function, the telephone not only a medium to transmit our voice, it also functions as POE, but i don’t what the technology call.

Power over Ethernet or PoE
Technology describes a system to transmit electrical power, along with data, to remote devices over standard twisted-pair cable in an Ethernet network. This technology is useful for powering IP telephones, wireless LAN access points, webcams, Ethernet hubs, embedded computers, and other appliances where it would be inconvenient, expensive (mains wiring must often be done by qualified and\or licensed electricians for legal or insurance reasons) or infeasible to supply power separately. The technology is somewhat comparable to POTS telephones, which also receive power and data (although analog) through the same cable. It works with an unmodified Ethernet cabling infrastructure.

My Current Wi-Fi Service provider also using this POE technology.
During the installation job, I went up to the celling and found a few unit of Dlink AP, there was a low quality AP, that why make a lot of connection problem and guest are complaining on the low signal. Some of the AP are not function and they did not come to replace.

I found the POE device attach along the AP, here is how the POE device look like.

Based on the diagram below, you should be able to imagine how this POE Adapter works, some call it as POE Injector as well.

Speaking on POE feature, just a fun fact for your information. Do you know POE Injector can be made using RJ45 keustone jack? You may interest to find out this DIY POE Injector post I make some time ago.