Telecommunications
Telecommunication systems are designed by telecommunication engineers.
In recent times, optical fiber has improved the bandwidth available
for intercontinental communication, helping to facilitate a faster
and richer Internet experience. In addition, digital television has
eliminated effects such as snowy pictures and ghosting. The entire
process consists of the transmission of signals over a distance for
the purpose of communication. It usually sends electromagnetic waves
by electronic transmitters. It can be better understood by comparing
it to communication in earlier years that involved smoke signals or
drums. Currently, telecommunications is widespread. This process is
used for DS3 and T3
communications. There are large arrays of networks
that connect devices, such as computer networks, public telephone networks,
radio networks and television.
Computer communication across the Internet, such as e-mail and instant
messaging, is just one of many examples of telecommunication. The basic
elements of a telecommunication system includes a transmitter that
takes information and converts it to a signal for transmission, a transmission
medium over which the signal is transmitted, and a receiver that retrieves
it and converts the signal back into usable information. If you are
using a radio broadcast, the tower is the transmitter, the radio is
the receiver and the transmission medium is free space. Usually, telecommunication
systems are two-way and devices act as both a transmitter and receiver.
For example, a mobile phone is a receiver. Telecommunication over a
phone line is called point-to-point communication because it is between
one transmitter and one receiver. However, telecommunication through
radio broadcasts is broadcast communication because it is between one
powerful transmitter and numerous receivers.
Signals can be analogue or digital.
Analogue signal means that the signal is varied continuously with respect to
the information. In a digital signal, however, the information is encoded as
a set of values. Telecommunication devices change different types of information,
such as sound and video, into electrical or optical signals. Electrical signals
usually travel along a copper wire or travel over the air as radio waves. Optical
signals, however, usually travel along strands of glass fibers. When a signal
reaches its destination, the device on the receiving end converts the signal
back into an understandable message, such as sound over a telephone, moving images
on a television, or words and pictures on a computer.
A network is a collection of transmitters or receivers that communicate
with each other. Digital networks may consist of one or more routers that
route data to the correct user. An analogue network may consist of one
or more switches that
establish a connection between two or more users. For both types of networks,
a repeater may
be used to amplify or recreate the signal when it is being transmitted
over long distances. This combats attenuation that
can render the signal indistinguishable from noise.
This means that a decrease in energy, per unit area of a wave or a beam
of particles, occurring as the distance from the source increases as a
result of absorption, scattering, spreading in three dimensions.
