|
NETWORK GLOSSARY
Network Topologies
network topology is defined
as: the schemes of joining a number of computers in the form
of a network are called Network Topologies.
Physical Transmission media
In physical Transmission
media, communication devices are directly linked with each
other via cables or other physical materials for data
communication.
Twisted-Pair Cable
It is
one of the most commonly used communication media for
network cabling. It consists of two separate copper wires
that are covered by insulating material such as plastic and
twisted together to form a cable.
Coaxial Cable
Coaxial Cable is also referred to as coax. It consists of a
single copper wire surrounded by insulating materials. Usually,
it is surrounded by three layers.
-
Insulting material
-
Solid metal shield
-
External plastic cover
Fiber-Optic Cable
In
twisted-pair cable and coaxial cable, data is transmitted in the form of
electric frequencies. So copper wire has to be protected from water and
electromagnetic waves. In fiber optic cable, these types of problems are
not occurred. The fiber-optic cable uses light to transmit data. A
fiber-optic cable consists of hundreds of thin glass fibers or strands
of glass. Each strand is referred to as optical cable.
Wireless Networking
In Wireless transmission
media, communication devices communicate with each other and
data is communicated through the air or space using
broadcast radio signals, microware signals and infrared
signals. This transmission medium is used when it is
impossible to install the cables. The data can be
transmitted all over the world through this medium.
Broadcast Radio
It is a wireless transmission
medium that is used to communicate information through radio
signals in air, over long distance such as between cities
and countries. In this medium, a transmitter is required to
send messages and receiver is required to receive them. To
receive the broadcast radio signal, the receiver has an
antenna that is located in the range of signal. Some
networks use a special device called transceiver used
to send and to receive messages in the form of radio
signals. The data transmission speed of broadcast radio is
up to 54 Mbps.
Microwaves
Microwaves
are radio waves that provide a high speed transmission. In
microwaves transmission, data is transmitted from one
station to another. Microwaves station contains an antenna,
transceiver and other equipments that are required for
microwave communication. The data transmission speed of
microwave transmission is up to 150 Mbps.
Digital Modem
The modem that is used to
send and to receive data to and from a digital telephone
line is called digital modem. ISDN modem and DSL modem are
the best example of digital modem. These modem are used to
send and receive the digital data to and from the digital
line, So there is no need to convert to analog signals
because digital lines already use the digital signals.
|
COMPUTER TIPS