TRANSMISSION MEDIA

By:Ms Pinkey

Mahipal Faculty –

Computer

TRANSMISSION MEDIA

Transmission Media refers to the physical media through which communication signals are transmitted .

Alternatively, It is a physical path by which a

message travels from sender to receiver.

TRANSMISSION MEDIA

Computers and telecommunication devices use signals to represent data.

These signals are transmitted from a device to another in the form of electromagnetic energy.

• Not all portion of the spectrum are currently usable for telecommunications

• Each portion of the spectrum requires a particular transmission medium

Voice Signals are transmitted as current over metal cables.

Radio Frequencies are generally transmitted through air or space.

Visible Light which is currently being used for communication through fibre optic cable.

CLASSES OF TRANSMISSION MEDIA

GUIDED MEDIA

Guided transmission media use a cabling system that guide the data signals along a specific path.

Guided Media is also known as Bound Medium as the data signal is bound by the cabling system.

TYPES OF GUIDED MEDIA

1. Twisted Pair

2. Coaxial Cables

3. Optical Fibre

TWISTED PAIR

Separately Insulated Twisted Together Often “ bundled into cables Usually installed in building during constructions Twisted-pair cables are used in telephones lines to

provide voice and data channels.

Pros and Cons

Benefits The twisting helps to reduce the interference (noise) and

crosstalk.

It is less expensive compared to other types of pairs

Drawbacks Used in short distance communication (less than 100

metres)

Speed is slower compare to other means.

COAXIAL CABLES

Highly resistant to signal interference

It offers higher bandwidth than the twisted pair cables.

Transfers data at the rate of 10 Mbps

Used in cable TV network.

OPTICAL FIBRE

Transmits signals over much longer distances than coaxial and twisted pair.

Carries information at vastly greater speed than other media.

But, Fibre optics cables is the most expensive and is very difficult to install.

UNGUIDED MEDIA

Unguided transmission media is data signals that flow through the air.

They are not guided or bound to a fixed channel to follow.

One of the common unguided media of transmission is radio frequency.

Questions?

1. Which media does not come under the guided media?

a) Optical Fibres

b) Coaxial Cables

c) Microwave

d) Twisted Pair

c. Microwave

Which of the following cables support the highest bandwidth and faster transmission rate?

a) Twisted Pair Cables

b) Coaxial Cables

c) UTP Cables

d) Fibre Optic Cable

Fibre Optic Cables.

Questions?

1. Transmission Media are usually categorized as ______________

a) Fixed or unfixed

b) Guided or Unguided

c) Determinate or Indeterminate

d) Mettalic or Non Mettalic

Guided or Unguided

In fibre optics, the signal is _______

a) Light

b) Radio

c) Infrared

d) Very Low frequency

Light

Which of the following primarily uses Guided Media

a) cellular telephone system

b) local telephone system

c) satellite communications

d) radio broadcasting

Local Telephone System

A(n) _____ medium provides a physical conduit from one device to another.

a) Guided

b) Unguided

c) either (a) or (b)

d) none of the above

Guided

________ cable consists of two insulated copper wires twisted together

a) Coaxial

b) Fiber-optic

c) Twisted-pair

d) none of the above

Twisted Pair

_______ cable is used for voice and data communications.

a) Coaxial

b) Fiber-optic

c) Twisted-pair

d) none of the above

Twisted Pair

_____ cable can carry signals of higher frequency ranges than _____ cable.

a) Twisted-pair; fiber-optic

b) Coaxial; fiber-optic

c) Coaxial; twisted-pair

d) none of the above

Coaxial; twisted-pair

_________ media transport electromagnetic waves without the use of a physical conductor.

a) Guided

b) Unguided

c) Either (a) or (b)

d) None of the above

Unguided

THANK YOU