Use Network Cabele Tester

To my friend wich work with computer with network,we must butuh some tool to repair if more pheripheral is down function and so rude to use,if this problem is on the cable network we must check with LAN Tester UTP cable.
BNC or UTP ..?
functional of Network Cable Tester is more than I think now,
let"s to see this manual together :
BNC Axes :
fristly
1.Put one end of the cable into both main tester and BNC Port,and put the
other into the remote tester.
2.Switch on the power Network cable tester,wich works if the light is on
3.BNC Light will not to be on when the cable is connected.
4.Press the button on the left of the main tester,if the light is green,the cable is worked with surely , if not ,the cable is out of work , and see with carefully
TEST UTP Cable :
1.put on end the cable into the main tester.
2.Swich on the power ,wich work if the light flashed.
3.Once swiched on ,LEDS of the remote tester will scan the cable accordingly. if the cables are
good , the corresponding LEDS will turn green sequently.if the cable is out of work,the LEDS
will first turn green then red or other , according to manufacturer./

and the last thank u for all