Business Networks and Telecommunications

Chapter 6

By Attaullah Sahil

Understanding telecommunication and networks

Difference between internet, Intranet and Extranet

Identify major developments and trends in the

industries, technologies and business applications

Identify the basic functions and types of

telecommunications networks used in business.

Explain the major types of telecommunications

network hardware, media, and services.

Learning OutcomesLearning Outcomes

Grouping of two or more computers and/or

devices by a medium for the purpose of data

and resource sharing

NetworkNetwork

The exchange of information in any form (voice, data, text, images, audio, video) over networks or over distance

TelecommunicationTelecommunication

1. Sharing files

2. Sharing printers and other devices

3. Enabling common administration and security

4. Supporting network applications like e-mailing

5. Computing applications become available for

business-to-business coordination and commerce

Primary reasons for networkingPrimary reasons for networking

A public network or networks of networks where

million of computers and/or devices are connected

together for the purpose of sharing information and

offering range of services.

1.WWW and websites

2.Instant Messaging

3.File Transfer Protocols

4.Internet Telephony

5.E-Commerce etc….

InternetInternet

Internet ApplicationsInternet Applications

Business uses of InternetBusiness uses of Internet

A Private network with the boundary of an organization

that use internet technology and being use by the Business

Manager, Employees with in the premises of an

organization

The internet technology include

WWW, Websites, Messengers, Email, TCP/IP, HTTP, FTP

Intranet example:

Kardan Attendance, Digital Library within University,

Kabul Bank Branches

IntranetIntranet

Business Value of IntranetBusiness Value of Intranet

Network links that use Internet technologies to interconnect the intranet of a business with the intranets of its customers, suppliers, or other business partners

ExtranetExtranet

Trends in TelecommunicationTrends in Telecommunication

Towards more competitive vendors, alliances and the

growth of Internet and World wide web in the industries

Industry TrendIndustry Trend

Towards extensive use of internet, optical fiber and wireless technologies to create high speed local and global network for voice, data, images, video communication

Technology TrendTechnology Trend

Towards the use of Internet, enterprise Intranets and Extranets to support E-Business & E-Commerce, enterprise collaboration in local and global market

Application TrendApplication Trend

Business value of TelecommunicationBusiness value of Telecommunication

Telecommunication technologiesTelecommunication technologies

1. Computers

1. Servers

2. Client

2. Network Operating System

3. Networking Hardware

4. Networking Media

5. Protocols

Elements of NetworkingElements of Networking

1. LAN (Local Area Network)

2. WAN (Wide Area Network)

Network Classification by Geographic sizeNetwork Classification by Geographic size

1. Client/Server network

2. Peer to Peer network

Classification by Network ArchitectureClassification by Network Architecture

Topology is the physical layout of a network

Three main topologies are most commonly used for

setting a LAN

• BUS

• Ring

• Star

Network TopologiesNetwork Topologies

Modem (Modulation/Demodulation)

Transform digital signal to analog signals and vice versa

DSL Modem

When you get a DSL line must also use a DSL

modem and special network card

Cable Modem

Device that allows your computer to access Internet

via a cable TV connection.

Network HardwareNetwork Hardware

Switching and Routing

Messages you transmit must be routed to arrive at

the destination computer

Packet Switching

Data is divided up into small chunks called packets

Each packet has a number and is separately addressed

to the destination computer

Use TCP/IP to makes sure the packets are delivered

Network HardwareNetwork Hardware

Router

Device that makes sure packets be sent to destination

They route the traffic and packets aren’t send in order

All networks connected to the Internet use routers

Use routing tables to decide how the packet be delivered

Router identify the shortest possible path for the packets

Receiving computer must put them back in correct order

If some packets didn’t make it, receiving computer

requests a re-transmission

Switching and RoutingSwitching and Routing

The amount of data transmitting in a media/cable per unit

time. The more the bandwidth the more the speed of data

transmitted.

Classified into:

Downstream Bandwidth (Download)

Upstream Bandwidth (Upstream)

Measured in bps, Kbps, Mbps, Gbps

How much do we need?

For text – 56 Kbps is enough

For graphics as in the Internet – 128 Kbps or high

BandwidthBandwidth

Twisted pair Wire used for telephone is called twisted pair Consists of two insulated wires – twisted so it protects the wire from electromagnetic interference

Connections based on telephone wiring includeISDN – Integrated Services Digital NetworkDSL - Digital Subscriber LineDial-up Line

Network MediaNetwork Media

Your Computer

Friend’s Computer

Coaxial Cable Center wire surrounded by insulation and Used for cable TV Connections based on coaxial cable include

Cable Modem which Sends and receives signals over the cable TV network

Users share network access with other Cable TV subscribers and slow down if too many users are on-line

Network MediaNetwork Media

Fiber Optic CableThin strands of glass that use light to transmit signals

Each strand as thin as a human hair and is protected by insulation and protective coating

Fiber Optic Have Advantages over Coaxial and Twisted PairCan carry more signals and Faster data transmissionLess susceptible to interference from outside devices

Network MediaNetwork Media

Complete OverviewComplete Overview