Download - Business networks and telecomunication
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
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
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
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