TYPES OF CABLES
1.TWISTED PAIR CABLES
2.CO-AXIAL CABLES
3.OPTICAL CABLES
TWISTED PAIR CABLES
Cables having twisted
pairs of wires are called twisted paired cables.
pairs of wires are called twisted paired cables.
These cables are of
two types:
two types:
UTP (unshielded
twisted pair) cable
twisted pair) cable
-this cable is not
shielded and hence it is sensitive to external electrical interference
shielded and hence it is sensitive to external electrical interference
or EMI
(electro-magnetic interfernce
(electro-magnetic interfernce
-it is cheap and
widely used in local area networks.
widely used in local area networks.
-UTPs are available
in different categories-cat5,cat5e,cat6 and cat7
in different categories-cat5,cat5e,cat6 and cat7
(cat=category,e=enhanced)
STP (shielded twisted
pair)
pair)
-this cable is
shielded and hence it is less sensitive to external electrical interference or
EMI.
shielded and hence it is less sensitive to external electrical interference or
EMI.
-this cable is
expensive and not widely used.
expensive and not widely used.
WHY WIRES ARE TWISTED
IN TWISTED PAIR CABLES ?
IN TWISTED PAIR CABLES ?
Twisting help in
stopping electrical interference from the wires to each other. In other
words,twisting help in
stopping electrical interference from the wires to each other. In other
words,twisting help in
stopping cross-talk.
CO-AXIAL CABLE
Cable used in cable
TV is co-axial cable. It has two conductors.One conductor is in straight copper
wire and
TV is co-axial cable. It has two conductors.One conductor is in straight copper
wire and
the other conductor
is in wire mesh.Both the conductors share the same axes.
is in wire mesh.Both the conductors share the same axes.
Co-axial cables are
rarely used now-a-days in networking.
rarely used now-a-days in networking.
Co-axial cables are
available in different ratings
available in different ratings
RG-8 (THICK CO-AXIAL CABLE)
RG-58 (thin co-axial cable)
RG-59 (used in cable TV)
(RG = Radio Grade)
OPTICAL CABLE
Optical cable
contains optic fibres. A optic fibre is very thin and it can carry light to
transmit information from one
contains optic fibres. A optic fibre is very thin and it can carry light to
transmit information from one
PC to another.It is
mainly used in Metropolitan area networks.
mainly used in Metropolitan area networks.
Optical cable only
use light to transmit data and hence they are not sensitive to external
electrical interfernce or EMI.
use light to transmit data and hence they are not sensitive to external
electrical interfernce or EMI.
They are used in long
distances.
distances.
Media converters(MC)
are used to install optical cable. A media converter converts light into
electricity and vice-versa.
are used to install optical cable. A media converter converts light into
electricity and vice-versa.
