6-1. telecommunications and networks business value of networks the internet network components...
TRANSCRIPT
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Telecommunications and Networks
Business value of networksThe Internet
Network components
Chapter
6
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Learning Objectives
1. Understand the concept of a network.2. Apply Metcalfe’s law in understanding the
value of a network.3. Identify several major developments and
trends in the industries, technologies, and business applications of telecommunications and Internet technologies.
4. Provide examples of the business value of Internet, intranet, and extranet applications.
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Learning Objectives
5. Identify the basic components, functions, and types of telecommunications networks used in business.
6. Explain the functions of major components of telecommunications network hardware, software, media, and services.
7. Explain the concept of client/server networking.8. Understand the two forms of peer-to-peer
networking.9. Explain the difference between digital and
analog signals.
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Learning Objectives
10. Identify the various transmission media and
topologies used in telecommunications
networks.
11. Understand the fundamentals of wireless
network technologies.
12. Explain the concepts behind TCP/IP.
13. Understand the seven layers of the OSI network
model.
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Case 1: Wireless, Wireless Everywhere
Wireless sensor devices or motes
Package together a circuit board, software,
sensors and wireless radio
Uses mesh networking software to transmit data
from one mote to another
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Case Study Questions
1. What are some of the business benefits associated with using wireless networks to collect and transmit data?
2. What are some of the challenges being faced in this use of wireless technologies? What solutions can you offer?
3. The use of wireless networking as described in the case is both innovative and useful. What other business uses can you envision for this approach?
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Real World Internet Activity
1. The companies mentioned in this case, Intel,
IBM, SAIC, and GE are all familiar names
often associated with innovative approaches
to technology. Using the Internet,
See if you can find examples of other
companies that have found ways in which to
apply mote wireless technology to business
needs.
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Real World Group Activity
One way of describing this use of wireless
technologies is that it represents a marriage
between RFID and wireless networking. This
combination of enabling technologies results in an
entirely new way of accomplishing an old task. In
small groups,
Brainstorm other combinations of existing technologies
to create new approaches to existing business
activities.
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Network Concepts
NetworkAn interconnected chain, group or system
Number of possible connections on a network is N * (N-1)Where N = number of nodes (points of
connections on the network)Example, if there are 10 computers on a
network, there are 10 * 9 = 90 possible connections
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Metcalfe’s Law
The usefulness of a network equals the square
of the number of users
On a small network, a change in technology
affects technology only
On a large network like the Internet, a change
in technology affects social, political and
economic systems
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Telecommunications
Telecommunications
Exchange of information in any form (voice,
data, text, images, audio, video) over networks
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Trends in Telecommunications
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Open Systems
Information systems that use common standards for hardware, software, applications and networks
Internet networking technologies are a common standard for open systems
Connectivity: Ability of networked computers to easily access and
communicate with each other and share information Interoperability:
The ability of an open system to enable end user applications to be accomplished using different varieties of computer systems, software packages, and databases provided by a variety of interconnected networks
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Middleware
Any programming that serves to “glue
together” two separate programs
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Digital Network Technologies
Rapid change from analog to digital network technologies
Analog: voice-oriented transmission, sound waves
Digital: discrete pulse transmissionDigital allows:
Higher transmission speedLarger amounts of informationGreater economyLower error ratesMultiple forms of communications on same circuit
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Internet2
Next generation of the Internet
High-performance network
In use at 200 universities, scientific
institutions, communications corporations
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Business Value of Telecommunication Networks
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The Internet
Over 46 million servers (2004)
710 – 945 million users (2004)
No central computer system
No governing body
No one owns it
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Internet Service Provider
ISP
A company that specializes in providing easy
access to the Internet
For a monthly fee, you get software, user name,
password and access
ISPs are connect to one another through
network access points
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Popular uses of the Internet
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Using the Internet for business
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Business value of the Internet
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An Intranet
A network inside an organizationThat uses Internet technologies (such as Web
browsers and servers, TCP/IP protocols, HTML, etc.)
To provide an Internet-like environment within the organization
For information sharing, communications, collaboration and support of business processes
Protected by security measures Can be accessed by authorized users through the
Internet
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Enterprise Information Portal
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Extranet
Network links that use Internet technologies
To connect the Intranet of a business
With the Intranets of its customers, suppliers or
other business partners
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Extranet Uses
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Case 2: Maryland and ColoradoServing their customers without using
wires
Earth Alert Emergency Management System in
Maryland provides
Devices to communicate warning to individuals
before a disaster, and
Tools to collect timely information after a disaster
Aurora Colorado
Connects police and fire department vehicles via
wire-less connections
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Case Study Questions
1. What is the business value of advanced mobile
technologies to Maryland’s emergency
management services?
2. In what other government services could GPS
serve to provide business value? Give some
examples.
3. Are there disadvantages or risks associated with
the deployment of GPS systems to monitor the
location of people? Explain.
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Real World Internet Activity
1. The global positioning system (GPS) is a major technological achievement that has broad-reaching implications for business. Using the Internet,
See if you can find other innovative uses for GPS. Good places to start familiarizing yourself with
current accomplishments are The GPSWorld site at
http://www.gpsworld.com/gpsworld/ The GPS Overview at
http://www.colorado.edu/geography/gcraft/notes/gps/gps_f.html
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Real World Group Activity
The first Real World Case in this chapter discussed
the combination of two existing technologies, RFID
and wireless networking, to create an innovative
business solution. In small groups,
Brainstorm innovative applications of GPS and other
existing technologies.
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Telecommunications network
Any arrangement where a sender transmits a
message to a receiver over a channel
consisting of some type of medium
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Telecommunications network components
Terminals: any input/output device that uses networks to transmit or receive data
Telecommunications Processors: devices that support data transmission and reception
Telecommunications Channels: media over which data are transmitted and received
Computers: all sizes and typesTelecommunications Control Software: programs
that control telecommunications activities
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Telecommunications network model
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Wide Area Network (WAN)
Telecommunications network that covers a large geographic area
Source: Courtesy of Cisco Systems Inc.
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Local Area Network (LAN)
Connect computers within a limited physical area such as an office, classroom, or building
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Virtual Private Networks (VPN)
A secure network that uses the Internet
as its backbone but relies on firewalls,
encryption and other security
A pipe traveling through the Internet
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VPN
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Client/Server networks
Clients: End user personal computers or
networked computers
Interconnected by LANs
Servers: manage networks
Processing shared between clients and
servers
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Client/Server Network
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Network Computing
Networks are the central computing resource of the organization
Thin clients: network computers and other clients provide a browser-based user interface
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Peer-to-peer networks
Networks that connect from one PC to another
PC
Common use is the downloading and trading
of files
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Peer-to-Peer Network
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Telecommunications Media
Twisted-pair wire:
Ordinary telephone
wire
Copper wire
twisted into pairsSource: Phil Degginger/Getty Images.
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Telecommunications Media
Coaxial cable:
Sturdy copper or
aluminum wire
wrapped with
spacers to insulate
and protect it
Source: Ryan McVay/Getty Images.
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Telecommunications Media
Fiber-optic cable:
One or more hair-
thin filaments of
glass fiber
wrapped in a
protective jacket
Source: CMCD/Getty Images.
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Problem of “The Last Mile”
Network providers use fiber optic to provide
backbone
But houses are connected to the backbone via
twisted-pair
Cannot get the benefit of the faster, better
technology
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Wireless Technologies
Terrestrial microwaveEarthbound microwave systems that transmit
high-speed radio signals in a line-of-sight path
Between relay systems spaced approximately 30-miles apart
Communications satellitesSatellite serves as relay stations for
communications signals
Uses microwave radio signals
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Wireless Technologies
Cellular and PCS telephone and pager systemsDivide the geographic area into small areas or
cellsEach cell has transmitter or radio relay antenna
to send message from one cell to anotherWireless LANs
Radio signals within an office or buildingConnect PCs to networks
BluetoothShort-range wireless technologyTo connect PC to peripherals such as printer
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Wireless Web
Connect portable communications devices to the Internet
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Telecommunications Processors
Modems
Convert digital signals from a computer into
Analog frequencies that can be transmitted over
ordinary telephone lines
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Comparing modem and other technologies
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Internetwork Processors
Switch – makes connections between
telecommunications circuits in a network
Router – intelligent communications processor
that interconnects networks based on different
protocols
Hub – a port switching communications processor
Gateway – connects networks using different
communications architectures
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Communications Processors
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Telecommunications Processors
Multiplexer
Allows a single communications channel to carry
simultaneous data transmissions from many
terminals
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Telecommunications Software
Used by servers and other computers to
manage network performance
Network Operating Systems
Middleware
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Network management functions
Traffic Management – manage network resources and traffic to avoid congestion and optimize service levels to users
Security – provide authentication, encryption, firewall, auditing and enforcement
Network Monitoring – troubleshoot and watch over the network, informing network administrators of potential problems before they occur
Capacity Planning – survey network resources and traffic patterns and users’ needs to determine how best to accommodate the needs of the network as it grows and changes
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Network Topologies
Topology: structure of a network
Star: ties end user computers to a central
computer
Ring: ties local computer processors together in a
ring on a relatively equal basis
Bus: local processors share the same
communications channel
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Network Topologies
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Network Architectures & Protocols
Protocol: standard set of rules and procedures
for the control of communications in a network
Network Architecture:
Master plan of standard protocols, hardware,
software and interfaces between end users and
computer systems
Goal of promoting an open, simple, flexible, and
efficient telecommunications environment
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OSI & TCP/IP Models
Open Systems Interconnection (OSI) ModelA seven-layer model that serves as a standard
model for network architecturesModel for how messages should be transmitted
between two points in a networkEach layer adds functions
Transmission Control Protocol / Internet Protocol (TCP/IP)A five layer telecommunications protocol used
by the Internet
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OSI & TCP/IP Models
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Internet Telephony
Using an Internet connection to pass voice
data using IP
Voice over IP (VoIP)
Skips standard long-distance phone charges
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Bandwidth
Bandwidth
Frequency range of a telecommunications channel
Determines transmission rate
Classified in bits per second (bps)
Transmission Rates:
Narrow-band – low-speed
Broadband – high-speed
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Transmission Speeds
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Switching Alternatives
Circuit Switching
Switch opens a circuit to establish a link
between a sender and receiver
it remains open until the communication session
is completed
Packet Switching
Break messages into groups called packets
Transmit packets separately
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Network Interoperability
Ensure that anyone anywhere on one network
Can communicate
With anyone anywhere on another network
Telecommunications as discussed in this chapter
wouldn’t be possible without interoperability
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Case 3: Voice Over IP is the Real Thing
VoIP works by
Digitizing a voice signal,
Chopping it into packets, and
Sending them over a company’s network or the
Internet
Packets are reassembled at the destination
Minnesota Department of Labor has cut its
monthly phone bill in half
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Case Study Questions
1. What are the main benefits that can be gained by companies that switch to VoIP systems?
2. What are some of the major cost factors that may limit a positive rate of return from investments in VoIP projects?
3. Should more companies switch to VoIP systems? Visit the websites of Avaya and Cisco Systems to view their VoIP news, products, and services to help you answer.
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Real World Internet Activity
1. VoIP is becoming a highly competitive marketplace for the delivery of services and the development of software to support the process. Using the Internet,
See if you can identify who the major players are in this market.
Where do you see the next significant development for VoIP?
Do you think the concept will eventually replace conventional telephone technologies? Why or why not?
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Real World Group Activity
The original concept for the Internet never included many of the uses we have found for it and consider commonplace today. While Internet2 is on the horizon, we need to think about what uses we may want from the Internet in the future. In small groups,Brainstorm how we might use the Internet in the
future.
Do we run the risk of overloading the Internet or relying on it too much?