Basically how it works is that you connect one part to each end of the cable, the slim part slides off the wider part, you can do this either before or after the cable is ran, I do mine after since a lot of the runs you can not do with a cable end on the cable...lol
But anyway one end of the cable (RJ45) is connected to the tester and it has 8 leds, it sends a signal down each wire in the plug to the corresponding wire at the other end, so it will start at say pin one if it lights you know that is good...it runs through each pin/wire so the display should go from 1 to 8 in sequence and then start over, if it goes from 1 to say 3 then back to 2 then to 5 you have crossed wires and you have to cut the plug off, throw it away, and start over again. if it goes from 1 and doesn't light 2 but lights every other led in sequence then that wire was too short, didn't get crimped right, or some failure, again you cut the plug off and try again with a new plug...
If it doesn't light any of the lights, you have the color code reversed on one end or the other and you find the end that isn't correct, cut the plug off and try again with a new plug.....there are a few other scenarios but I think you get the jest....in every instance you cut the plug off and try again with a new plug.
You will also find it's much easier to run your cable through any conduit or obstruction and once it's clear (outside the house, you can determine the length of cable you need (rough run) and install the RJ45 while on the ground, test the cable, then if it's good finish running your cable (don't forget to add the cover that has to be slid on the cable (comes with camera) before adding the connector)
Anyway I'd take a couple foot length of cable and your tools and practice making patch cables, once you make a good cable or two you can move on to making the camera cable runs with some confidence....I didn't do this but you should...lol
Nothing will replace the knowledge you get from actually doing it and messin' up then figuring out what you did wrong, you will find that there are two color conventions for how the wires are laid out in the plug, I will tell you it makes no difference how it is color coded as long as you do the same scheme on each end, it will make a difference if connecting one end to a patch panel (punched down) and a RJ45 to the other end, so it's a good idea to use the correct color code and always use that code......no sense in deviating from a standard until you fully understand what your doing and can do it with ease.
I will virtually guarantee your first screw-up will be the orientation of the wires in the plug, it still trips me up sometimes...you'll see. lol
