basic multifunctional network tester check type 5,5e,6 twisted cord oem is okay basic multifunctional network tester >check type 5,5e and 6 twisted cord network and trouble. >check cable sequence >use TDR(time domain reflectometer),measure length and distance,find the trouble location. >find the determine open circuit,short circuit,jumper or crossfire. >service line test and no external adaptor ...