Line Loss and Power over Ethernet calculator ( PoE )



injectors - 5v to 56v


PoE Tester



YouTube videos
The PoE calculator by WiFi-Texas calculates the total power required for any device including cable loss by any type or length of cable, over Ethernet or not, it calculates the voltage drop and power required by both the device and the loss in the cable. Since a device is speced for power consumption over a range of input voltages, as the remotely delivered voltage decreases with distance, the amps increase, causing the delivered voltage to decrease further.

The WiFi-Texas calculator is the first to calculate total power including the effects of voltage drop.


Value
default
values
your
parameters
A Number of pairs used for POE
1 simple wire
2 802.3af, standard
4 PoE+
Ethernet over Coax
BCable type
Cat-5e Copper
Cat-6 Copper
Cat-7 Copper
Cat-5e low cost Cu/Al
Cat-6 low cost Cu/Al
Cat-5e cheap
RG-59/U Coax 22 awg center
RG-6/U Coax 18 awg center
RG-11/U Coax 14 awg center
Or enter other
Ohms/1000 ft
see AWG table below
CDistance in ft
(328 is max for Ethernet)
or Meters

or
Ft
meter
DSupply Voltage (56v max)
802.3at 56 Volts
802.3at 51 Volts
802.3af 48 Volts
UBNT/MT 24 Volts
non-PoE 12 Volts
non-PoE  5 Volts
USB  5 Volts
or enter other
Volts
EPower required by remote device
or
Amps
Watts
FNumber of Devices to power


Cat-5e and Cat-6 cable is sold in pure Copper and in Copper / Aluminum alloy ( Cu/AL ) variations.
Cu/Al is standard at Home Depot etc, and unless specified, assume all CAT-5 isn't copper
Cu/Al has higher resistance, so the loss is greater.
There is also extremely low cost cable that uses thinner 28 AWG wire on the 45 and 78 pairs, resulting in high loss.
PoE via coax allows 300 ft of CAT-6 then 800 ft of coax then 300 ft of cat-6 for a total of 1400 ft. Calculate the final voltage in three segments.

Our Calculator will give a warning if the link is too long
At long distances, the result is unstable and cannot be solved
we will suggest minimum voltages for the length entered

If you have more than one device per endpoint
change the value in line F

Chinese CCA cat-5 uses 28 awg on the power pairs @ 101 ohms


Examples of different devices
VendorDevicepower in wattsVoltageNote
802.3
802.3af15.4 max48v
802.3at25.5 max48v
Foscam
F1982185v 1.35mmuse 5v splitter after 15 ft
F19802512v 2.1mmuse 12v splitter after 100 ft
F1891865v 1.35mmuse 5v splitter after 15 ft
F18918E548v PoEuse 48v injector block
F18918E5or 5v 1.35mmor use 5v splitter after 15 ft
F1891665v 1.35mmuse 5v splitter after 15 ft
F1891045v 1.35mmuse 5v splitter after 20 ft
F18910E448v PoEuse 48v injector block
F18910E4or 5v 1.35mmor use 5v splitter after 15 ft
F1890945v 1.35mmuse 5v splitter after 15 ft
F1890845v 1.35mmuse 5v splitter after 15 ft
F1890745v 1.35mmuse 5v splitter after 15 ft
F1890565v 1.35mmuse 5v splitter after 15 ft
F18905E648v PoEuse 48v injector block
F18905E6or 5v 1.35mmor use 5v splitter
F1890465v 1.35mmuse 5v splitter after 15 ft
F18620612v 2.1mmuse 12v splitter after 100 ft
F1860845v 1.35mmuse 5v splitter after 15 ft
F18602612v 2.1mmuse 12v splitter after 100 ft
Ubiquiti
Rocket M6.524v
Rocket GPS8 24v
Bullet M27 24v
Bullet M56 24v
Nanostation M96.5 24v
Nanostation M2, M55.5 24v
Nanostation M365 8 24v
Picostation M2, M5 8 24v
Unifi UAP4 24v
Unifi UAP-LR6 24v
Unifi UAP-PRO12 48v
Unifi UAP-outdoor4.6 24v
Unifi UAP-outdoor56.4 24v
Aircam2.4 24v
Aircam Dome3.5 24v
Aircam Mini3 24v
OpenMesh
OM1P518v
OM2P518v
MR500618v
Mikrotik
Groove4.6 30v
RB433L2 watts pcb +
3 watts per pci
28v
RB411L1.4 watts pcb +
3 watts per pci
28v
RB7114.5 28v
PEP
OfficePoint616v
Tranzeo
EX21112v PoE
TR6 family724v
TR5 family724v
Deliberant
Passive POE818v

one CAT-5e spec

Ohms per 100 ft at different temperatures