chapter 04 it-8ed-volonino

Network Management and Mobility

Chapter 4

4-1Copyright 2012 John Wiley & Sons, Inc.

Manage ment Informati on Syste msEIMBA

Part II. Data and Network Infrastructure

Copyright 2012 John Wiley & Sons, Inc.

Chapter 4 Outl ine

4.1 Business Networks

4.2 Wireless Broadband Networks

4.3 Network Management and Portals

4.4 Collaboration

4.5 Green, Legal, and Ethical Issues

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Chapter 4 Learning Objecti ves

Describe networks, standards, and mobility.

Discuss network and collaboration technologies.

Understand 4G and other mobile networks.

Describe group work technologies.

Evaluate green, social, and ethical issues related to the use and operations of networks.

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F o r C l a s s D i s c u s s i o n & D e b a t eWorld's First 4G WiMAX Rail Network

Scenario for Brainstorming & Discussion (see book for full text)

a) Discuss potential consequences of the 4G WiMAX/Wi-Fi Rail Network. What constraints have been eliminated?

b) Assume that other cities have implemented similar systems and that commuters own mobiles with the latest mobile OS. Brainstorm some far-reaching impacts of such a networked transportation system in the U.S.

c) Identify several risks or negative unintended consequences. Discuss your estimate of their costs--both financial and non-financial ones.

d) What impact might this network have on other transportation methods? Would those changes be helpful or harmful to the environment?

e) How do all taxpayers benefit from this tax-supported network?

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Debate (see book for full text)

a) Identify 4 business-related risks that you face as a user who relies on the DOT network; and how those risks might impact you or your job.

b) Assume that each risk actually happened. Debate the following: Who is responsible or is no one responsible of the consequences of each one? Take the position that it’s:

• no one’s fault (“technology crashes happen”)• the DOT’s fault as the provider, or• the user’s fault

That is, when things go wrong with the network, who gets the blame and who suffers the consequences?

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4.1 Business Networks

Business networks support 4 basic functions:

1. mobility

2. collaboration

3. relationships

4. Search

Common to all network functions are traffic and the circuits that transmit the traffic.

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Network basics

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Figure 4.2 A signal is transmitted from a sender/source to a receiver/destination via circuit or packet switching.


Switching: transmission of the signal Circuit switching: Circuit switching is older technology that

was used for telephone calls. Plain old telephone service (POTS) and most wired telephone calls are transmitted, at least in part, over a dedicated circuit.

Packet switching: The path of the signal is digital, and is neither dedicated nor exclusive. A file is broken into smaller blocks, called packets.

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Figure 4.3 Wireless routers use antennae to transmit signals


Network Terminology Bandwidth: Throughput capacity or speed of a network. Protocol: Standards that govern how networked devices

exchange information. TCP/IP: Transmission control protocol/Internet Protocol) are a

suite of Internet protocols. Broadband: Short for broad bandwidth.

• Fixed-line broadband: Cable or DSL Internet connections.

• Mobile broadband: Wireless high-speed Internet access through a portable modem, phone, or other device.

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3G and 4G networks

3G: Short for third generation of cellular telecommunications technology.

4G: Short for fourth generation. 4G mobile network standards enable faster data transfer rates.

Users can get 4G wireless connectivity through one of two standards: 1. WiMAX2. LTE (Long-Term Evolution)

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4.2 Wireless Broadband Networks

Enterprises are moving away from unsystematic adoption of mobile devices and infrastructure to a strategic build-out of mobile capabilities.

• But identifying strategic technologies and avoiding wasted investments is difficult.

Mobile infrastructure consists of technology, software, support, security measures, and devices to manage and deliver wireless communications.

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Figure 4.4 How Wi-Fi works


Wi-Fi allows computers to share a network wirelessly without connecting to a commercial network.

Figure 4.5 WiMAX/Wi-Fi network architecture

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WiMAX: a broadband wireless metropolitan area network (MAN) access standard that can deliver voice and data at distances of 30 miles


4.3 Networks Management and Portals

When the network goes down or access is blocked, so does the ability to operate or function.

Damages when a company cannot operate or fulfill orders include:• lost sales and productivity• Inability to send and receive payments• inability to process payroll and inventory

Network infrastructure alone does not improve business performance. It’s how network capabilities combine with other IT to support employees, connect remote locations, service customers, and coordinate with supply chain partners.

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Copyright 2012 John Wiley & Sons, Inc.4-15

Figure 4.6 Model of Network, Collaboration, and Performance Relationship

Copyright 2012 John Wiley & Sons, Inc.16

IT at Work 4.1

Check page 102


TCP/IP Networks

The Internet protocol suite consists of the IP (Internet Protocol) and TCP (Transport Control Protocol), or TCP/IP.

In preparation for transmission, data are digitized into packets and sent via packet-switched networks, local area networks (LAN), or wide area networks (WAN).

Voice over IP (VoIP), or IP telephony, involves an analog-to-digital conversion. Voice and data transmissions travel over telephone wires in packets.

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Internet Application Categories

Discovery or search. Discovery involves browsing, finding, and retrieving information.

Communication. Developments in Internet-based and wireless communication such as podcasting, RSS, and micro-blogging transform business communications, marketing channels, and supply chain management

Collaboration. Tools and technologies are available, ranging from online meetings with screen sharing to videoconferencing and group support systems.

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Figure 4.9 Overview of enterprise search.



Network Computing Infrastructures

Intranets: a network serving the internal informational needs of a company.

Extranets: private, company-owned network that uses IP technology to securely share part of a business’s information or operations with suppliers, vendors, partners, customers, or other businesses.

Extranets can use virtual private networks (VPNs). VPNs are created using specialized software and hardware to encrypt/send/decrypt transmissions over the Internet.

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Figure 4.7 Virtual Private Network (VPN)



4.4 Collaboration

Messaging and collaboration tools include: older communications media such as e-mail,

videoconferencing, fax, and IM newer media such as blogs, podcasts, RSS,

wikis, VoIP, Web meetings, and torrents (for sharing very large files)

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Group Decision Processes

Benefits of working in groups: Groups tend to be better than individuals at understanding problems. Group members have their egos embedded in the decision, and so they

will be committed to the solution. A group has more information (knowledge) than any one member. Groups

can leverage this knowledge to create new knowledge. Groups are better than individuals at catching errors.

Despite the benefits of collaborative work, groups are not always successful.

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Collaboration Support Technologies

Portals, intranets, extranets, and shared workspaces are examples.

Web 2.0 or Enterprise 2.0 technologies such as wikis, blogs and microblogs, provide more options to promote and support enterprise collaboration.

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4.5 Green, Legal, and Ethical Issues

Managers need to consider ethical and social issues, such as quality of working life.

Workers will experience both positive and negative impacts from being linked to a 24/7 workplace environment, working in computer-contrived virtual teams, and being connected to handhelds whose impact on health can be damaging.

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Risks and Ethical Issues

Driving while distracted

Health

Personal time

RF emissions and SAR• specific absorption rate, or SAR, is a way of measuring the quantity of

radio frequency (RF) energy that is absorbed by the body.

Life out of control

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Chapter 4 Link Library• Google Wave http://wave.google.com/ video wave.google.com/about.html#video• Twitter network status http://status.twitter.com/• Azulstar http://azulstar.com/ • Clear 4G WiMAX http://clear.com • International CTIA Wireless Tradeshows http://ctiawireless.com/ • Cisco http://cisco.com • Microsoft SharePoint 2010 http://sharepoint.microsoft.com/Pages/Default.aspx • Cellular Telecommunications Industry Association http://ctia.org/ • WiMAX Forum http://wimaxforum.org • Packet switching flash demo

http://pbs.org/opb/nerds2.0.1/geek_glossary/packet_switching_flash.html • Cell phone radiation levels (SAR)

http://reviews.cnet.com/2719-6602_7-291-2.html?tag= • Kaiser Permanente HealthConnect video http://youtube.com/kaiserpermanenteorg

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http://wave.google.com/

http://wave.google.com/about.html

http://status.twitter.com/

http://azulstar.com/

http://clear.com/

http://ctiawireless.com/

http://cisco.com/

http://sharepoint.microsoft.com/Pages/Default.aspx

http://ctia.org/

http://wimaxforum.org/

http://pbs.org/opb/nerds2.0.1/geek_glossary/packet_switching_flash.html

http://reviews.cnet.com/2719-6602_7-291-2.html?tag=

http://reviews.cnet.com/2719-6602_7-291-2.html?tag=

http://youtube.com/kaiserpermanenteorg

chapter 04 it-8ed-volonino

Technology

john wiley sons

network management

network functions

network capabilities

commercial network

network terminologybandwidth

dot network

network basics figure