19-08-2013, 04:21 PM
NETWORK and ARCHITECHTURE of TELECOMMUNICATION
NETWORK and ARCHITECHTURE.pptx (Size: 1.5 MB / Downloads: 21)
Communications
The message (data and information) is communicated via the signal. The transmission medium “carries” the signal.
Telecommunications
Telecommunications
The electronic transmission of signals for communications, including such means as:
Telephone
Radio
Television
Data Communications
A specialized subset of telecommunications that refers to the electronic collection, processing, and distribution of data -- typically between computer system hardware devices.
Computer Network
Computer Network
The communications media, devices, and software needed to connect two or more computer systems and/or devices.
Used to share hardware, programs, and databases across the organization.
Fosters teamwork, innovative ideas, and new business strategies.
Types of Telecommunication Media
Twisted Pair Wire Cable
Insulated pairs of wires historically used in telephone service and to connect computer devices.
Coaxial Cable
Consists of an inner conductor wire surrounded by insulation, called the dielectric. The dielectric is surrounded by a conductive shield, which is surrounded by a non-conductive jacket. Coaxial cable has better data transmission rate than twisted pair.
Telecommunication Devices
Analog Signal
Electricity current
Digital Signal
A signal represented by bits
Modems
Devices that translate data from digital to analog and analog to digital
Distributed Processing
Centralized Processing
Data processing that occurs in a single location or facility.
Distributed Processing
Data processing that occurs when computers are placed at remote locations but are connected to each other via telecommunications devices.
The computers are connected as a computer network.
Network Topologies
Hierarchical
Uses treelike structures with messages passed along the branches of the hierarchy
Hybrid
A mix of different kinds of structured topologies. It is what exactly the Internet looks like.
Mobile Adhoc Network
It is unstructured network topology
Structure is changing dynamically. EG. Network of mobile phone.
Communications Software
Provides error checking, message formatting, communications logs, data security and privacy, and translation capabilities for networks.
Network Operating System (NOS)
Systems software that controls the computer systems and devices on a network and allows them to communicate with each other.
Network Management Software
Enables a manager on a networked desktop to monitor the use of individual computers and shared hardware, scan for viruses, and ensure compliance with software licenses.