CEDIA ESPA EST Practice Test

Answer - D - NEXT test places a test signal on one pair of wires and measures all of the other wire pairs for signal presence to measure the crosstalk levels.

Key Takeaway: NEXT, or Near-end Crosstalk, is an error condition that occurs when connectors are attached to twisted pair cabling and the wire pairs are either crushed or crossed. NEXT test is performed in steps of 1 MHz from 1 MHz to 16 MHz. Since the level of signal loss or interference can change with frequency, testing against a range of frequencies certifies that the cable is acceptable over the entire range.