Soso

Only available on StudyMode
  • Download(s) : 64
  • Published : February 10, 2013
Open Document
Text Preview
Course Name: Information Systems Strategy - MS2 Module: 8 Module Title: Managing telecommunications and networks Lectures and handouts by: Brian Friedrich, MEd, CGA, FCCA(UK) Laura Friedrich, MSc, CGA, FCCA(UK) 2010-11

Module 8 - Table of Contents
Part 1 2 3 4 5 6 Content Overview of telecommunications and Network basics (8.1 & 8.3) Strategic uses of telecommunications and trends in network management (8.2 & 8.4) Network security issues (8.5) Planning and managing wireless networks (8.6) Remote computing management issues (8.7) Assignment 3 tips 2

Part 1 - Overview of telecommunications and Network basics (8.1 & 8.3) Seven basic communications model elements: •  Sender and Receiver •  Encoder and Decoder •  Channel •  Message and Noise

3

1

Part 1 - Overview of telecommunications and Network basics (8.1 & 8.3) Compare the different channels used in telecommunications networks (Level 1). Two types of signals: •  Digital - streams of 0s and 1s –  Electrical pulses –  Computer data •  Analog - continuous waves –  Voice –  Traditional cable television 4

Part 1 - Overview of telecommunications and Network basics (8.1 & 8.3) The functions of a modem •  Modulation - converting digital signal to analog (e.g., to send message from computer across network to Internet) Demodulation - converting analog signal to digital (e.g., to receive message from Internet across network to computer)

• 

Mo

Dem
5

Part 1 - Overview of telecommunications and Network basics (8.1 & 8.3) Telecommunications channels can be divided into two groups: 1.  Wired (conducted) –  Twisted pair - e.g., telephone wire, Ethernet –  –  –  Coaxial cable - e.g., television cable Fibre optic USB, FireWire

6

2

Part 1 - Overview of telecommunications and Network basics (8.1 & 8.3) 2. Wireless (radiated) –  Different functions naturally occupy, or are assigned, different ranges within the electromagnetic spectrum –  AM/FM radio –  Microwave –  Satellite relay –  Cellular phones, pagers –  Infrared - e.g., remote controls –  Bluetooth devices - e.g., PDAs 7

Part 1 - Overview of telecommunications and Network basics (8.1 & 8.3) Choosing between Wired and Wireless Factors to consider •  •  •  •  •  •  Cost Speed/bandwidth Expandability/Scalability Security Durability Distance 8

Part 1 - Overview of telecommunications and Network basics (8.1 & 8.3) Wired •  •  •  •  •  Generally higher transmission rates More secure (especially fibre optics) More durable Greater distances - less attenuation Higher cost, requires more resources to install and maintain 9

3

Part 1 - Overview of telecommunications and Network basics (8.1 & 8.3) Wireless •  •  •  •  •  Lower transmission rates Less secure, less reliable Generally local in reach Convenient access Less expensive to set-up and maintain

10

Part 1 - Overview of telecommunications and Network basics (8.1 & 8.3) Explain the purpose of communication protocols and list the most common protocols in use today (Level 1). •  Telecommunications protocols are the rules and procedures that govern the transportation and communication of information and data. Telecommunications protocols will: –  identify – check for errors –  notify – correct errors –  verify 11

• 

Part 1 - Overview of telecommunications and Network basics (8.1 & 8.3)

• 

In order for two devices to communicate they must use the same protocols.

• 

Most common protocol is TCP/IP (Transmission Control Protocol/Internet Protocol), which is used by the Internet.

12

4

Part 1 - Overview of telecommunications and Network basics (8.1 & 8.3) OSI reference model •  •  •  •  Models network communications by using 7 theoretical “layers” At each layer, protocols guide the packaging of the message which is then passed to the next layer Allows developers to treat layers that are irrelevant to their product as a “black box” Makes communication and development of network solutions easier 13

Part 1 - Overview of...
tracking img