Fluke Series II user manual Twisted Pair Cables, Cable Tests, Introduction

Models: Series II

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Cable Tests

Introduction 4

Twisted Pair Cables

Twisted pair cable is currently the most popular cable in LAN systems. The 10BASE-T standard for twisted pair cabling systems is much more popular than coaxial based Ethernet networks because it is easier to work with and is inherently more reliable. The 10BASE-T standard is valid for Unshielded Twisted Pair (UTP) and Shielded Twisted Pair (ScTP).

UTP cable typically consists of four pairs of 24 AWG (American Wire Gauge) solid or stranded wire surrounded by an insulating jacket. ScTP cable adds a foil shield around the four pairs to improve its noise immunity. The wires in each pair are twisted around each other, and the four pairs, in turn, are twisted together inside the cable sheath. Most UTP and ScTP cables have characteristic impedance of 100Ω. However, in some countries UTP is also available in 120Ω. The Cable Tests described in this chapter are designed to work with 100Ω cabling systems.

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Page 54
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Fluke Series II user manual Twisted Pair Cables, Cable Tests, Introduction