Original subtitles

hello everyone in this video we're going

to be talking about power over ethernet

now networking devices need electrical

power to function and that's why they

have a separate power cable but some

networking devices don't have a power

cable it's not that they don't need

electrical power it's just that they get

their power and data from the same cable

which is through the ethernet cable this

technology is called Poe which stands

for power over ethernet and this

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power over ethernet is a technology that

delivers DC power to networking devices

such as IP phones security cameras and

wireless access points over the copper

wires in an ethernet cable which

eliminates the need for a separate power

cable

so how does Poe work how does an

ethernet cable Supply a networking

device with both data and power well an

ethernet cable has four pairs of twisted

pair wires inside so it has a total of

eight wires now in CAT5 and previous

versions of ethernet cable four of those

wires are used to transfer data but the

other four wires were not used so in a

typical networking device four wires

were used for data and four wires

weren't used for anything so in order to

supply power to a device early versions

of Poe use the four unused wires to

transfer power while later versions of

Poe use all eight wires to transfer

power

so here we have a view of a CAT5

ethernet cable and its twisted pair

wires that haven't been arranged yet so

if we go ahead and straighten out these

wires and arrange them to the correct

wiring standard the wires and pins one

two three and six are used for

transmitting data and the wires and pins

457 and 8 are used for transferring

power

now in order for data and power to be

transferred through this cable it must

be connected to a power sourcing

equipment or PSE device a PSE device

supplies data and DC power to a powered

device or PD using an ethernet cable so

in this example our PSC device is a Poe

switch and our power device on the other

end is a Poe IP phone so when we plug an

ethernet cable into this switch the

switch will send data and power through

the cable to the phone so there's no

need for this IP phone to have a

separate cable for power because it's

getting it through the ethernet cable

now what if we plug this ethernet cable

into a standard non-poe switch well

nothing would happen because this IP

phone needs both data and power to

function and this standard switch can

only transmit data through the cable and

not power however there is a way to

transmit both data and power to this IP

phone without replacing the switch and

that is by using a Poe injector a Poe

injector converts a non-poe device to a

Poe device without replacing your

existing equipment a Poe injector has

two ports a lan port and a Poe Port the

Lan Port would be connected to one of

the switch's ports with an ethernet

cable and the poe Port would be

connected into the iPhone using another

ethernet cable and then the injector

will be plugged into an electrical

outlet so now the injector is getting

data from the switch and power from the

electrical outlet and its transmitting

them both over this ethernet cable to

the IP phone

so what are the benefits of power over

ethernet well for starters convenience

because for example when you have

multiple devices such as IP phones all

over a building those phones need

network data and they also need power to

function so not only do you have to run

network cables through the building and

connect them to their phones but you

also need to run power cables from an

electrical outlet to those phones and

that leads us to another benefit is that

it saves time and money because without

Poe you may need to hire an electrician

to install more power outlets in a

building which can be time consuming and

very expensive and another benefit is

flexibility because without the need of

devices having to be near electrical

outlets means that they can be placed in

more ideal locations and they can easily

be repositioned later on

there are also two different kinds of

power over Ethernet there is active and

passive when a powered device connects

to a Poe switch power is sent from the

switch to that device but some devices

may require different amounts of power

than others so if a device doesn't have

enough power it won't turn on or if it

gets too much power the device could

blow up so this is why active Poe was

created when a power device connects to

an active Poe switch the switch will

first test the connection to ensure

power compatibility and then it will

communicate with that device to be sure

it delivers the correct amount of power

that the device needs

now passive Poe is the dumb version of

Poe it doesn't talk to the devices it

constantly sends power and it sends the

same amount of power to whatever device

it's connected to so this is why it's

important to check the voltage

requirements of a power device before

connecting it to a passive Poe switch

because if you connect it to the wrong

voltage it could permanently damage your

equipment

power over ethernet was first developed

by Cisco in the year 2000 which was a

mechanism that they created to deliver

power and data to their IP phones

similar to how basic landline phones get

power using regular telephone lines and

in 2003 the first standardized version

of Poe which was the IEEE

802.3af or better known as type 1 was

released this standard had a power

output of 15.4 Watts which was enough to

power certain devices at that time so as

technology progressed engineers realized

the potential of this technology and

created a newer standard to supply power

to more power hungry devices and in 2009

the IEEE 802.3 a t standard or type 2

was released which is also known as Poe

plus and this standard doubled the power

output to 30 watts and in 2011 that

power was doubled again to 60 watts when

Cisco came out with their own

proprietary standard called Cisco

Universal power over ethernet and this

led to the release of the IEEE

802.3bt standard or type 3 which is also

known as four pair power over ethernet

which utilized all four pairs of wires

and in 2018 the 3bt standard was amended

and this had a power output of 90 Watts

which is enough to even power a laptop

computer so guys I want to thank you for

watching this video on power over

ethernet Please Subscribe and I will see

you in the next video