X10 Community Forum
📸Cameras & Camera Software => AirSight Cameras => Topic started by: richy2 on November 15, 2012, 12:21:38 PM
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I'm getting the XX40A and wondered which would be better for powering the camera
A 25ft 20Awg 2.1" 5.5"12mm plug to jack extension vs P.O.E?
what are the pros-cons for either or?
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Did some calculations.
50 feet of wire. 25 feet to the camera and 25 feet back.
Number 20 wire. If the camera draws 1 amp there is a .5 volt loss. At 2 amps there is a 1 volt loss.
POE uses a pair of wires for each voltage.
Pair 4 and 5 for positive. Pair 7 and 8 for negative.
Network cable comes in a few different gauges. #24 is common and what I used.
Pair of #24 wires. If the camera draws 1 amp there is a .6425 volt loss. At 2 amps there is a 1.285 volt loss.
I have seen some economical network cable using #26 and the losses would be higher.
I have seen some premium network cable using #22 and the losses would be less.
Losses maybe slightly higher or lower. Depending on wire type and the temperature.
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One more thought.
The information I calculated was for a passive POE setup where the wire pairs are used for passing the power directly to the camera.
Like the POE Kits X10 sells.
There are POE kits that use 48 volts at the sending end and a voltage regulator at the receiving end.
Many times with a choice of 5 volts or 12 volts feed to the camera.
Problem I have seen with those kits. Is the 12 volt rating is usually limited to one amp.
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Other than getting the power from the router to power the camera or not having an power outlet near where the camera is mounted...
what other advantages are there using a POE vs Power Outlet way.