A Transmission medium is a medium of data
transfer over a network. The selection of Media depends on the
cost, data transfer speed, bandwidth and
distance. Transmission media may be classified as-
(A) Guided (Wired) Media: It consists of
physical wired medium to carry signals.
Twisted Pair cable:
.
Twisted Pair or Ethernet cable is most common
type of media which consists of four insulated pairs of
wires twisted around each other. Twisting helps
to reduce crosstalk and Electro Magnetic Interference
(EMI) effects. There are two type of twisted
pair cable i.e. Un-Shielded Twisted Pair (UTP) and Shielded
Twisted Pair (STP), which contains extra shielding.
Advantages:
It is low-cost, low-weight and flexible cables.
It is easy to install and maintain and requires
RJ-45 Connector.
Limitations:
Suitable for short distance (up to 100 mt.). For
long distance Repeater is required.
It supports low bandwidth and offers up to 100
Mbps speed.
Coaxial Cable:
This types of cable consists a solid insulated
wire surrounded by wire mesh, each separated by some
kind of foil or insulator. The inner core
carries the signal and mesh provides the ground. Co-axial Cable
or Coax, is most common in Cable TV
transmission.
Advantages:
.
It offers high bandwidth and carry data for a
long distance (185-500 m)
.
Suitable for Broadband transmission (cable TV)
and can be used in shared cable network.
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