... CATE/CAT6/open circuit/short circuit 3.pass the CE and ROHS electric circuit tester , led circuit tester , open short circuit tester NS- ... 7 E, coaxial cable, telephone line fault of the connection, including: open, short circuit, cross connect, reverse connect and string ... cable length, show line length (a) on every page, and determine the fault (open) distance5.with digital audio found line function ...