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user interviews that require you to dig deeper into the intentions of the user In this situation, you might ask, How much time would be an unacceptable amount of time and What size are the large files you will be transferring You will be more likely to meet the requirements of the users if you gather specific user requirements instead of vague user requirements The point is this: when a user or group of users informs you of a requirement that is stated in nonspecific terminology, always ask for clarification The example in the preceding paragraph is very illustrative Users or managers will often use the term unacceptable without defining what they mean For example, if the users must be able to transfer large files without requiring an unacceptable amount of time, you must get the answers to three questions:
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What is a typical size for these large files How long would be unacceptable To or from where are the files being transferred
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The first question clarifies the size of the referenced files The second question could also be stated in the positive as, How long would be acceptable Either way, you will gain a more specific number for your analysis The third question is of utmost importance in this scenario If the users are transferring files to or from an FTP server on the Internet that is out of your control, you will have a limited amount of impact on the performance the users perceive You can only control the performance from the users client stations to the Internet connection The speed of the Internet, the remote network, and the remote FTP server may be completely out of your control In such cases, you must be sure to communicate what you can and cannot control Imagine the users tell you they are transferring files that are typically 5 megabytes in size and are transferring them to and from an internal FTP server Furthermore, they tell you the files should be transferred in less than one minute to be seen as acceptable You also determine that there could be as many as three users transferring these files at a given time This results in the following equation: 5 3 = 15 megabytes per minute You now know that you must provide a WLAN that will allow the users to transfer 15 megabytes per minute Assuming you also determine that there will be 1 megabyte of normal network traffic per minute, you actually need to be able to transfer 16 megabytes per minute Since you are implementing an enterprise-class access point with approximately 18 to 24 Mbps of actual data throughput (resulting
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in 225 to 3 MBps), you are confident that the WLAN will be able to maintain the demands of the users There has been much confusion over the difference between megabits per second and megabytes per second A bit is a value equal to 0 or 1, and a byte (in most computer systems) is a collection of eight bits Therefore, you can convert megabits per second (Mbps) to megabytes per second (MBps or MB/sec) by dividing the Mbps by 8 A 54 Mbps WLAN device is a 675 MBps device Since a 54 Mbps WLAN provides for only half or less than half the data rate as actual data throughput, you end up with the 18 to 24 Mbps referenced in the preceding paragraph (sometimes even less) This is a very important differentiation when you are attempting to calculate and ensure proper available throughput for your WLAN Another factor that must be considered is application type Some network applications transfer blocks of information without time sensitivity Examples include FTP, HTTP, and SMTP Other applications transfer blocks of information with time sensitivity and even sequence sensitivity Examples include Voice over IP and video over IP If the application has a low tolerance for latency (delays in the network) or jitter (variance in network delays), wireless equipment supporting QoS and fast secure roaming should be selected
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Business Requirements Manager interviews will provide you with insights into the business requirements for the WLAN Business requirements are a superset of user requirements The user requirements should be things that help the users act in such a way as to achieve business or organizational requirements Business requirements come from two primary sources: internal business requirements and external business requirements Internal requirements will be based on organizational objectives and policies such as security policies, employment policies, and so on External requirements will be based on regulations from local regulatory bodies such as federal and local governments and their agencies An example of a business requirement would be to say that the WLAN must allow the users to perform at the same level at which they have been able to perform on the wired LAN Ultimately, this business requirement is born out of the objective to improve performance or at least maintain it while also providing mobility The organization may want to move forward in the area of mobility, but not backward in the area of performance (data throughput) Modern applications are far more throughput intensive, and it is often unacceptable to reduce data throughput in a modern network implementation
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