The device detects open and short-circuited (wire/wire or wire/shield) connections. A two-line display (LEDs) sequentially indicates which pin of the RJ-45 connector from cable end A is connected to which pin of the RJ-45 connector from cable end B; manual or automatic switching is possible. In the event of a short circuit, more than two LEDs light up simultaneously. The device has two RJ-45 sockets (e.g. for testing patch cables); with the enclosed remote unit, cables laid in the wall can also be tested. For testing coaxial cables there are two adapter cables (BNC/RJ-45) with battery for the test device: 1x 9V block (not included). With the enclosed PoE check it can be tested whether there is PoE on a twisted pair line and if so which PoE mode (A = endspan / B = midspan) is used.

Attention: Do not connect the cable tester to devices during operation.