BUS 237 Chapter Notes - Chapter 6: Directory Service, Network Switching Subsystem, Post Office Protocol

• School: Simon Fraser University
• Department: Business Administration
• Course: BUS 237
• Professor: Zorana Svedic

Document Summary

Telecommunications the electronic transfer of data, transfer can occur between people and machines. Transmission media transfer of electronic data occurs (communication channels, transmission channel) Wired (guided: twisted pair copper (telephone/internet cable, coaxial cable (cable television, fiber optic cable (most secure way of transmitting data) Wireless (unguided: free space, radio waves (omnidirectional, microwaves (line-of-sight, infrared light (line-of-sight) Amount of electronic data that can be transferred using transmission media is bandwidth. Bandwidth is measured in bits per second such as kbps, mbps, gbps. Analog vs digital (two ways to send data) Analog continuously varying frequency smooth but inaccurate. Digital series of bits (high voltage=1, low voltage=0) accurate but choppy. Network collection of computers that communicate with one another over transmission lines. Can be as small as two machines or large enough to connect many machines across continents. Protocols - procedures used to transfer information between machines. Telecommunicaitons is the transfer of data between atleast two machines.