Download - Basics of telephone wiring
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
THANKS