Fluke DSP-2000 - Manual (Page 125)

Basic Cable Testing
Crosstalk and Near-End Crosstalk (NEXT)
7
7-13
Minimizing Crosstalk
Crosstalk problems are minimized by twisting together the two wires in each cable
pair. Twisting the two wires together causes the electromagnetic fields around the
wires to cancel out, leaving virtually no external field to transmit signals to nearby
cable pairs.
You can avoid problems with crosstalk by observing the following precautions
during installation:
•
When untwisting cable pairs to install connectors or make connections at
punch-down blocks, make the untwisted sections as short as possible.
•
Be attentive when making wiring connections. Wiring errors that cause split
pairs create severe crosstalk problems.
•
Do not make sharp bends or kinks in the cable. The radius of bends in a cable
should be larger than 1 inch (2.54 cm).
•
Handle LAN cable carefully during installation. Do not step on the cable or
pinch it with tight cable ties.