SEQUENCE

Telephone Wiring Components Cable Jack Common Trouble of Wires Symptoms Of Trouble

TELEPHONE WIRING COMPONENTS Cable Jack

CABLE

Unshielded Twisted Pairs (UTP) of Copper Wire

Wire Gauge 22 24

CABLE 2-Strand 4-Strand (2 Twisted Pair)

Red and Green Wires Yellow and Black Wires Wire Can Carry 2 Separate Phone Lines

6-strand, or higher (Multi Pair) Also Available

CABLE

WHY TWISTS

To Avoid Noise - External electromagnetic

signals Crosstalk - When wires are laid side-by-

side, the actual data traveling through them causes tiny external electromagnetic signals, that work their way into the adjacent wire

JACK

Types RJ-11(1-line plug) RJ-14(2-line plug)

RJ-11 Phone JACK & PLUG

COMMON TROUBLES OF WIRES Short Circuit - Two

conductors of a pair come in electrical contact with each other

Open Circuit - Break or Cut in one or both conductors of a pair

Grounded Circuit- One or more conductors of a wire come in contact with ground or grounded object

COMMON TROUBLE OF WIRES Crossed Circuit - Two

conductors, each of different Circuits, are in electrical contact with each other

SYMPTOMS OF TROUBLE

Open disrupts communication completely

Short disrupts communication completely

Cross circuit causes cross talk or interference between the two crossed circuits

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