Introduction

  1. The word communication is derived from a Latin word meaning “to share”.
  2. Communication is the act of giving, receiving, and sharing information — in other words, talking or writing, and listening or reading.

Types of Communication

Simplex Communication:

HALF DUPLEX AND FULL DUPLEX:

A common Example of Half Duplex Communication is walkie-talkies, amateur radio.

INTRODUCTION TO ETHERNET:

  1. Ethernet is a communication standard that was developed in the early ’80s to network computers.
  2. This local environment is defined as a LAN (Local Area Network) and it connects multiple devices so that they can create, store and share information with others in the location.
  3. Ethernet is a wired system that started with using coaxial cable and has successfully progressed to now using twisted pair copper wiring and fiber optic wiring.
  4. In 1983, Ethernet was standardized into the standard IEEE 802.3 by the Institute of Electrical and Electronic Engineers (IEEE). This standard defined the physical layer and the MAC (media access control) portion of the “data link” layer of wired Ethernet.

INTRODUCTION TO ETHERNET:

ETHERNET PHYSICAL LAYER:

These two layers are defined as the first two layers in the OSI (Open Systems Interconnection) model.

  1. The physical layer consists of the following components:
  • Cabling
  • Devices

ETHERNET CABLES

Ethernet cables come as;

Coaxial cable (which is not
very common except in older
installations)

 

 

 

 

 

Twisted pair

 

Fiber optic