Using Antennas in Site Surveys
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After performing these processes, you will generate the key output of the Design phase: a project plan The project plan will consist of the following common elements:
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All project charter information updated according to the Design phase
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Work breakdown structure (WBS) Budget Schedule Resource assignments Hardware acquisition plan Risk response plan
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Your project plan may have more or less information, but this is a rough guideline to the items that should be included in the plan
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Deliver The Deliver phase is where the work gets done The input to this phase is the project plan, and the processes include execution and control Of course, execution can be considered from two perspectives The first perspective is that of the task worker, who sees execution as doing the work The second perspective is that of the project manager, who sees execution as monitoring the work In smaller organizations, it is very common for the project manager to also be the task worker Control implies that the project should be constrained within the boundaries of the plan as much as possible This activity includes monitoring of the budget, the schedule, and the scope The scope is defined as the promised deliverables of the project The desired output of the Deliver phase is the accomplishment of the definition provided all the way back in the Define phase In addition, actual project schedules, budgets, and deliverables should be documented Determine You will know when it s time to move to the Determine phase all of the technical work is done Your WLAN exists The Determine phase takes the original schedule, budget, and scope and compares them to the actual schedule, budget, and scope The primary goal of the Determine phase is to evaluate the project with two major objectives in mind:
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Ensure that the project charter has been fulfilled Learn lessons for future projects
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Planning the Wireless LAN
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The greatest long-term value usually comes from the lessons learned analysis These lessons will benefit future projects, and over time, your project management skills and methodologies will mature, resulting in greater project success rates It is very tempting to skip the Define and Design phases of a project It is also tempting to avoid the Determine phase However, it is in these three phases that project management succeeds or fails If we always jump right into the work or quickly move on to the next project without consideration of the lessons learned in the current one, we are not truly utilizing project management
This chapter introduced you to the concepts related to WLAN implementation planning You learned about site surveys and the tools used during these surveys Both active and passive site survey tools were addressed and the issues related to manual and automated site surveys were reviewed Additionally, considerations related to antenna selection were addressed so that you can select the right antennas for a site survey scenario
Understand and Describe the Requirements
Business requirements are used to choose the proper wireless technology for
a given scenario
Security requirements are used to ensure that the wireless network is
implemented in a secure manner
Site-specific documents include blueprints and floor plans Power can be provided using PoE or direct connect Data throughput is different from the data rate The data rate is the total
speed available on the wireless medium, but much of the data rate is consumed by management overhead
Site Survey Types
Manual site surveys include the highest involvement of the wireless
Automated site surveys are performed by centralized software or hardware
Automated site surveys may result in overengineering Assisted site surveys automate many tasks but rely on the wireless technology
professional to make decisions as well
Manual Site Survey Types
Active site survey utilities transmit data to the WLAN Both active and passive site survey utilities read information from the WLAN
in order to provide data such as the SSID, channel, and signal strength
Client utilities may be used as site survey tools
Using Protocol Analyzers
Protocol analyzers allow for the analysis of the actual data traversing the
Protocol analyzers can be used to determine the channel, security parameters,
and signal strength of a wireless network
NetStumbler is a protocol analyzer dedicated to reading BSS information only
Planning the Wireless LAN
Using Spectrum Analyzers
Spectrum analyzers come in hardware, software, and hardware/software com-
A spectrum analyzer can be used to differentiate between Wi-Fi activity and
Spectrum analyzers often include signature analysis features Any laptop with a USB port can act as a spectrum analyzer
Using Antennas in Site Surveys
Wireless infrastructure devices, APs, and routers usually come with 22 dBi
Omnidirectional antennas are commonly available in 7 and 13 dBi
Omnidirectional antennas are most useful when you need to cover wide areas
from a central origination point
The coverage pattern of an antenna is revealed on Azimuth charts, and these
charts can be used to predict the coverage an antenna will provide
Patch, panel, and sector antennas are usually called semidirectional antennas Semidirectional antennas are useful for coverage in long, narrow areas Highly directional antennas are rarely used for indoor site surveys
The following questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully because there might be more than one correct answer Choose all correct answers for each question