Computer Communications Network
COMPUTER COMMUNICATION NETWORKS
Objectives
• • • • • What is telecommunication History of telecommunication Role of telecommunication in Organizations Interpersonal communication applications Computer networks
What is telecommunication?
“Transmission of data or audible/visible information by electrical/electronic means” e.g. telephone, telegraph, radio, television, computer networks (Internet)
Basic elements
1. Transmitter : takes information and converts it to a signal 2. Transmission medium :over which the signal is transmitted 3. Receiver : that receives the signal and converts it back into usable information. e.g. a radio broadcast: broadcast tower (Transmitter)
free space (transmission medium)
radio (receiver)
Basic Elements
• Transceiver : a single device that acts as both a transmitter and receiver, e.g a mobile phone is a transceiver • Point-to-point communication : Telecommunication over a phone line • Broadcast : Telecommunication through radio broadcasts (one powerful transmitter and numerous receiver)
History of Telecommunication
• Alexander Graham Bell Patented the Telephone in 1876. • Telephones came in pairs. • Separate wire had to be sprung to all connected houses.
History of Telecommunication
Copy of the original phone of Alexander Graham Bell at the Musée des Arts et Métiers in Paris
History of Telecommunication
• Bell formed the Bell Telephone Company, which opened its first switching office in 1878 (fig. a) • For long distance calls between cities multilevel switching offices were formed. (fig. b)
Fig. a
Fig. b
Role of telecommunication in Organizations
Enterprise collaboration system :
Information systems that use a variety of information technologies to help people work together • Communication • Coordination • Collaboration
Interpersonal Communication Applications: Electronic Mail
Electronic Mail: A store and forward method of composing, sending, storing, and receiving messages over
Objectives
• • • • • What is telecommunication History of telecommunication Role of telecommunication in Organizations Interpersonal communication applications Computer networks
What is telecommunication?
“Transmission of data or audible/visible information by electrical/electronic means” e.g. telephone, telegraph, radio, television, computer networks (Internet)
Basic elements
1. Transmitter : takes information and converts it to a signal 2. Transmission medium :over which the signal is transmitted 3. Receiver : that receives the signal and converts it back into usable information. e.g. a radio broadcast: broadcast tower (Transmitter)
free space (transmission medium)
radio (receiver)
Basic Elements
• Transceiver : a single device that acts as both a transmitter and receiver, e.g a mobile phone is a transceiver • Point-to-point communication : Telecommunication over a phone line • Broadcast : Telecommunication through radio broadcasts (one powerful transmitter and numerous receiver)
History of Telecommunication
• Alexander Graham Bell Patented the Telephone in 1876. • Telephones came in pairs. • Separate wire had to be sprung to all connected houses.
History of Telecommunication
Copy of the original phone of Alexander Graham Bell at the Musée des Arts et Métiers in Paris
History of Telecommunication
• Bell formed the Bell Telephone Company, which opened its first switching office in 1878 (fig. a) • For long distance calls between cities multilevel switching offices were formed. (fig. b)
Fig. a
Fig. b
Role of telecommunication in Organizations
Enterprise collaboration system :
Information systems that use a variety of information technologies to help people work together • Communication • Coordination • Collaboration
Interpersonal Communication Applications: Electronic Mail
Electronic Mail: A store and forward method of composing, sending, storing, and receiving messages over