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long distance lP camera wiring
I need a solution to running up to 1,000 feet of cable from an NVR with POE switch to 30 IP cams
I researched coax to cat 5 balums at $500 a piece
I researched POE cat 5 ethernet extentions at $250 a piece with a concentrator for about $2,000
I am researching 802.11 wireless IP technology
stop
Since I should only need to connect to two terminals on the camera for signal and two for power why can't I just use solid copper cat 5 and twist together the eight wires to form four thus doubling the guage of wire. This should allow them to travel twice the distance right? That would be 656 feet so then I need to find a 4 conductor (? guage wire to travel the 1,000 ft) is this theory corrector what?
If I end up being able to use a thicker guage wire to make up for the distance than how do I get it downsized to a fit the standard RJ45 ethernet jacks on the IP equipmnent I am using?
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Replies to This Discussion
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Permalink Reply by Mad Max on -
Is there some way you can bridge it with a bunch of intermittent routers? Or maybe fibre optics, if the budget allows.
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Permalink Reply by Charles Linquist on -
It is generally not the RESISTANCE of the wiring that limits the length you can send a signal. Generally, it is CAPACITANCE that will cause the signal to deteriorate over distance. Doubling up on the wire will probably not allow for greater transmission distances.
I have violated a lot of specs over the years and find that things generally work better than advertised. Try some CAT6 (lower capacitance) cable. It may work for your signals.
DC, however, does follow the "heavier gauge wire = less loss" formula, so the two wires carrying the power may need heavier wire. POE sends 48V (nominal) over the CAT5, and every device then uses a switching power supply to provide stable power (at a lower voltage) to the load. As long as you get at least 37V at the "far" end, POE will work. If you have less than 37V, you need to "double up" on the power wires or use a heavier gauge - but only for the wires carrying the power.
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Permalink Reply by Hazmatt on -
http://www.youtube.com/watch?v=ltHe3xAgjN4 In this video, TinkerNut shows how to setup a what I suppose you'd call amateur webcam security system using USB cameras, free software and Ustream to put the video online so you can access it anywhere with an internet connection (of course the show is set to private).
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