Basics of Telephone Wiring

2. SEQUENCE
 Telephone Wiring Components
 Cable
 Jack
 Common Trouble of Wires
 Symptoms Of Trouble

3. TELEPHONE WIRING
COMPONENTS
 Cable
 Jack

4. CABLE
 Unshielded Twisted Pairs (UTP) of Copper
Wire
 Wire Gauge
 22
 24

5. 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

6. CABLE

7. 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

8. JACK
 Types
 RJ-11 (1-line plug)
 RJ-14 (2-line plug)

9. RJ-11 Phone JACK & PLUG

10. 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

11. COMMON TROUBLE OF
WIRES
 Crossed Circuit - Two conductors,
each of different Circuits, are in
electrical contact with each other

12. SYMPTOMS OF TROUBLE
 Open disrupts communication
completely
 Short disrupts communication
completely
 Cross circuit causes cross talk or
interference between the two crossed
circuits

13. THANKS