1. Telecommunications, The Internet
and Wireless technology
Kristina

2. Telecommunications
 Communicating any kind of information through
electronic means
 Includes audio, video and digital data transmission

3. Telecommunication System
Components
 Computers used to process data into information
 Terminals that receive or send data
 Communication Software
 Communication Processors

4. Functions of Telecommunication
 Transmit the information
 Control flow of information
 Convert massages speed and format and route them
through most efficient paths
 Establish interface between sender and receiver

5. Analog VS Digital Signals
 Analog Signal is continuous waveform that passes
through communication medium and is used for audio,
video and voice communication
 Digital Signal is discrete waveform because it transmits
coded data in two discrete states: as 1bits and 0bits
 Digital Signal is used for data communication
 Modem converts/translates digital signals into analog
and vice versa

6. Wired VS Wireless Transmission
 Wired:
- Twisted wire: telephone systems
- Coaxial cable: cable television
- Fiber optics and Optical Network
 Wireless: microwave, satellite, cellular telephones, etc.

7. Types of Network
 Star Network: all computers and other devices are
connected to the host computer and if that computer’s
network fails, no other computer won’t have network
 Bus Network: links a number of computers by a single
circuit, if one network connection fails doesn’t mean that
the rest of computers’ networks will
 Ring Network: all devices are connected through closed
loop

8. LANs, WANs and WLANs
 LANs require their own dedicated channels such as
routers, gateways, Network Operating Systems (NOS)
 Span large geographical distance and consist of variety
of cables and satellites
 WLANs are Wi-Fis, they are low cost and enable high-
speed mobile Internet access; links for groups

9. Electronic Commerce and Business
Technologies
 Email: eliminates telephone costs
 Groupware: allows groups to participate from different
locations
 Voicemail: digitalized spoken message transmitted over
network
 Fax: digitalized documents over telephone line

10. Enterprise Networking
VS Internetworking
 Enterprise Networking arrangement of organization’s
hardware, software, network and data resources
 Internetworking connects all separated networks into one
interconnected network

11. Open Systems Interconnect (IOS) and
Internet Service Provider (ISP)
 IOS determines multiple-layer layouts to interconnect
different devices
 ISP organization with permanent connection to the
Internet that provides it to its clients

12. The Domain Name System (DNS)
 The Domain Name System (DNS) is a naming system for
computers, services, or any resource connected to the
Internet or a private network.
 It translates domain names meaningful to humans into
the numerical identifiers associated with networking
equipment for the purpose of locating and addressing
these devices worldwide.

13. Intranets VS Extranets
 Intranet: Firewall – a hardware or software paced
between an organization’s internal and external network
which prevents outsiders from using/joining private
network
 Extranet: Private intranets extended to authorized users
outside company