Definition of Telecommunications
"is the sending of information in any form from one place to another using electronic or light-emitting media."
Definition of Data Communications
"describes the transmitting and receiving of data over communication links between one or more computer systems and variety of input/output terminals."
Why Telecommunications is Important?
Applications of Telecommunication
Enterprise Collaboration Systems=
"use telecommunications networks to support telecommunication, coordination and collaboration among the members of business teams and workgroups."
Electronic Commerce Systems =
"support the buying and selling the products, services and information over the internet and other computer networks."
Internal Business Systems=
"depend on variety of computer networks to support a company's business operation."
Telecommunication Network Model
Local Area Networks(LANs)= connect computers and other information devices within a limited physical area, such as an office, manufacturing plant and other work site.
Wide Area Networks(WANs)= telecommunication network that cover large geographical area or spans a large geographical area.
Internetworks= the linking of separate networks, each each of its retain its own identity into an interconnected network.(internetwork processors= switches, routers, hubs or gateways.)
Intranets= are design to be open, but secure, internal networks whose web browsing software provides easy point-and-click access by end users to multimedia information on internal websites.(MARA)
"is the sending of information in any form from one place to another using electronic or light-emitting media."
Definition of Data Communications
"describes the transmitting and receiving of data over communication links between one or more computer systems and variety of input/output terminals."
Why Telecommunications is Important?
- End users need to communicate electronically to succeed in today's global information society.
- Enhance collaboration and communication among individuals both inside and outside an organization via internet.
- Need to electronically exchange data and information with other end users, customers, suppliers and other organizations.
Enterprise Collaboration Systems=
"use telecommunications networks to support telecommunication, coordination and collaboration among the members of business teams and workgroups."
Electronic Commerce Systems =
"support the buying and selling the products, services and information over the internet and other computer networks."
Internal Business Systems=
"depend on variety of computer networks to support a company's business operation."
Telecommunication Network Model
- Terminal= any input/output device that uses telecommunications networks to transmit or receive data.
- Telecommunication Processors= support data transmission and reception between terminals computers.[modem, multiplexer, front-end-processors]
- Telecommunications Channels and Media= part of telecommunication network that connect the message source with the message receiver.
- Computers= computer of all the sizes and types are interconnect by telecommunications networks so that they can carry out their information processing assignment.
- Telecommunication Control Software= consists of program that control telecommunications activities and manage the functions of telecommunication networks.
Local Area Networks(LANs)= connect computers and other information devices within a limited physical area, such as an office, manufacturing plant and other work site.
Wide Area Networks(WANs)= telecommunication network that cover large geographical area or spans a large geographical area.
Internetworks= the linking of separate networks, each each of its retain its own identity into an interconnected network.(internetwork processors= switches, routers, hubs or gateways.)
Intranets= are design to be open, but secure, internal networks whose web browsing software provides easy point-and-click access by end users to multimedia information on internal websites.(MARA)
Extranets= are networks that link some of the internet resources of a company with other organizations and individuals (authorized) (credit card)
Client Server Network= Client- on a network, any computer that can access the server.
Server- a high capacity, high speed computer with a hard disk- control all some procedures on a network.
Telecommunication Network Topologies
Topology= the way in which components of a network are connected. 3 basic topologies used in WANs and LANs :
Star Network= A network topology in which all computers and other devices are connected to a central hub.
Ring Network= A network topology in which all computers are linked by a close loop in a manner that passes data in one direction from one computer to another.
Bus Network= Network topology linking a number of computers by a single circuit with all message broadcast to entire network.
Transmission Mode
Asynchronous
Synchronous
- Transmit one character at a time, each character preceded by a start bit and followed by a stop bit and error check bit.
- Used for low-speed transmission rates.
- Transmit group of characters at a time, the beginning and end of character determine by the timing circuitry of a communication processors.
- Used by large computer to transmit huge volume of data at high speed.
Point-to-Point Lines
Multi-drop Lines
- Each terminal (sender and receiver) is directly connected by their own line.
- More expensive than multi-drop lines.
- Are used if there will be continuous connections between a computer and aterminal or other computer system.
- Connect many devices (not just sending and receiving device).
- Cheaper than point-to-point line because each line is shared by many terminal.
- Communication Processors such as multiplexers and concentrators are used to help many terminals share the same line
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