basics of telephone wiring
DESCRIPTION
Basics of Telephone WiringTRANSCRIPT
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SEQUENCE
Telephone Wiring Components Cable Jack Common Trouble of Wires Symptoms Of Trouble
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TELEPHONE WIRING COMPONENTS Cable Jack
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CABLE
Unshielded Twisted Pairs (UTP) of Copper Wire
Wire Gauge 22 24
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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
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CABLE
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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
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JACK
Types RJ-11(1-line plug) RJ-14(2-line plug)
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RJ-11 Phone JACK & PLUG
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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
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COMMON TROUBLE OF WIRES Crossed Circuit - Two
conductors, each of different Circuits, are in electrical contact with each other
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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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THANKS