How to be sure that RJ 45 and the cable are connected right without tester?

By the coler code

with the checking a colour codes

If the cable is already installed the most easy way is to perform a PING test between the two nodes using the cable.

when you install the wired cable RJ45 both sides  should have the same sequance of colors and all the pins are attached well, when you plugedin the RJ if the connection correct it should haf flashed (usually green and yellow) then do ping test ip addres of which is connect to 

basm allah alrahman alrahim

we always look to RJ45 from front or back , did you try before to look to it from side view

there is a small8 heads serrate came out from pins and that what must the wires touch 

so you must not make the wires deeply touch the end ( of caurse if you make it touch the end that will be better) ,in most cases we cant see that the wires reach the end but if we look to it from side view we will be sure that it success to reach the part we want

In some cases we cut the wires to be close to the out side cover (and thats what must be done)and when we do that we may not cutted with right length so we must not cutted a gain we just can make it reach the serrate and it will work fine 

there is a nother way used with cable cat6 , RJ45 with a head inside a head if you bay it it will make life easier

Check the Cables and paired wire touches the end of notch(RJ45 connector) both the end. one end goes in a router or a switch,the other side in the Ethernet card that is connect to computer. when connected the both sides of the cables in a Switch/Router then there is a LED(Green ,Yellow,Orange) is activated and blinks at both the ends. That is NIC Led and switch Led). open command prompt,try to ping other computer NIC(network interface card),if it gives you reply.then its all fine.

Thanks for reading,

Regards,

Ahmed.

check that the end of pins is touching the end of the RJ45 connecter