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Jill and Terry run A-Z Pet Kare in New Des Moines, Ohio The company provides pet grooming services and offers an entire inventory of pet care products They lease space in a storefront plaza totaling 2360 square feet The plaza is shown in Figure A-1 In order to better track their work, Terry has decided to implement a wireless network The new network will allow him to carry a Pocket PC with him as he moves from area to area with customers This Pocket PC will run an application allowing him to check pricing and inventory as well as update the inventory from any location It is a simple application requiring manual input from the user for all inventory management Jill has indicated that Internet connectivity is important and that they already have a DSL router providing approximately 2 Mbps of bandwidth She says this is plenty of bandwidth, but she wants to be able to connect from her laptop so that she can update the A-Z Pet Kare Web sites with information about customer pets regardless of her current location in the facility While the space is small, the facility is separated into three rooms: a main entry room, the pet grooming room, and a pet boarding room while the pets await their owners return Jill states that all of this space must be covered
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Appendix A: Wireless LAN Case Studies
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FIGURE A-1
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A-Z Pet Kare lease location
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Jim s Books Great Subs A-Z Pet Kare
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In addition to these issues, Jill and Terry have communicated the following requirements:
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They want to be able to assure their customers that customer information
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is secure
The wireless network should not interfere with neighboring networks and
cause inter-company conflicts
Jill and Terry want to be able to access the network from home using their
Internet connection, but this connection must be secure
The WLAN must work with the wireless radio built into Jill s laptop The
laptop supports 80211b/g networks
The Solution
Based on the information presented by Jill and Terry, a standard WLAN should suffice The only special hardware or software required is a VPN solution for connectivity from home Now that the decision to implement a standard WLAN is final, implementation can begin Of course, this implementation starts with a proper site survey
Performing a SOHO Implementation
The Implementation
With any WLAN implementation, the first step is the site survey Regardless of size, a site survey must be performed in order to ensure that the WLAN can operate as desired and to discover the best way to implement it Following the site survey, the wireless technology specialist can perform the installation Finally, the network should be fully tested and optimized
Site Survey
Since the A-Z Pet Kare wireless network was a small installation, a simple site survey was performed During the survey, the engineer learned a number of important things about the environment Figure A-2 represents the wireless activity as discovered at the time of the survey The engineer ran NetStumbler on a laptop computer in order to find local WLANs that may cause interference or demand special considerations when installing the A-Z Pet Kare WLAN Once the engineer determined that channels 1, 6, and 11 were all in use within the needed coverage area, he began the process of locating the different networks As Figure A-2 shows, channel 6 was already utilized by two networks and both networks seemed to have strong signals For this reason, the engineer immediately ruled out those channels The next step was to look at channels 1 and 11 and find out which network s signal was weaker from within the A-Z Pet Kare facility After monitoring for a few minutes, the engineer determined that both channels 1
FIGURE A-2
NetStumbler detecting WLANs
Appendix A: Wireless LAN Case Studies
and 11 have SNRs (signal-to-noise ratios) fluctuating between about 6 and 12 Since the networks provide about the same level of signal coverage in the intended space, the engineer could negotiate with either of the organizations in order to acquire frequency space for the new A-Z Pet Kare WLAN In order to negotiate with the WLAN owners, the engineer needed to discover the source of the network signals for channels 1 and 11 To do this, he simply walked around with his laptop and observed as the signal strength increased or decreased for each channel Figure A-3 shows the results of the engineer s efforts With a better picture of the wireless activity, the engineer decided on a different negotiation tactic He pointed out to ProperAid and Jim s Books that their networks were both configured in such a way that they were causing adjacent channel interference with themselves The interference is not critical, but the networks will perform better without it Because each company had two APs very close to each other and configured for adjacent channel usage, their performance was suffering He explained that they would both be better off if they used channels 1 and 11 Of course, it is very important in negotiations such as these that the engineer clearly communicates that he or she will not be performing the reconfiguration, but that he can provide suggestions for those who will be doing the work In this case, the engineer s communications worked and the surrounding organizations adjusted
FIGURE A-3
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