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From page 60... ... 60 A P P E N D I X A One may do Internet searches on "electromagnetic interference" and find many references to the subject. However, they tend to span the range from a Wikipedia explanation of the fundamentals to complex circuitry and radio frequency (RF) Read the entire page →
From page 61... ... Radio Frequency Primer 61 The Communications Act of 1934 established the Federal Communications Commission. The stated purposes of the Communications Act are: "regulating interstate and foreign commerce in communication by wire and radio so as to make available, so far as possible, to all the people of the United States a rapid, efficient, nationwide, and worldwide wire and radio communication service with adequate facilities at reasonable charges, for the purpose of the national defense, and for the purpose of securing a more effective execution of this policy by centralizing authority theretofore granted by law to several agencies and by granting additional authority with respect to interstate and foreign commerce in wire and radio communication, there is hereby created a commission to be known as the Federal Communications Commission, which shall be constituted as hereinafter provided, and which shall execute and enforce the provisions of this Act." (1) Read the entire page →
From page 62... ... 62 A Guidebook for Mitigating Disruptive WiFi Interference at Airports A brief summarization of the spectrum interference management governed by the Communications Act of 1934 and technology that influenced the proliferation of small personal communications up to the present time is provided in Attachment 1: Spectrum Management in Its Early Days. The regulatory process to place these devices in the spectrum and difficulties they pose to management in an airport environment are discussed in the following sub-sections. Read the entire page →
From page 63... ... Radio Frequency Primer 63 security, tarmac vehicle control, baggage check-in, and wireless credit card transactions require higher priorities, while conducting business or watching videos in the airport gate area is a lesser priority. These priority levels may be used for airport WiFi distribution or RF isolation of the more critical WiFi uses and the criticality of resolving interference complaints. Read the entire page →
From page 64... ... 64 A Guidebook for Mitigating Disruptive WiFi Interference at Airports Harmful Electromagnetic Interference as Applied to WiFi at Airports Legacy spectrum allocation is built on a hierarchy of licensed users in the spectrum bands, e.g., "primary and secondary." This hierarchy organizes the interference mitigation process by spectrum allocation priority. On the other hand, all users in the ISM band are equal in priority under the Part 15 governance. Read the entire page →
From page 65... ... Radio Frequency Primer 65 many more available channels and the channels do not overlap. The topic of passenger hotspots presents potentially severe issues in the WiFi environment that deserve more in-depth analysis. Read the entire page →
From page 66... ... 66 A Guidebook for Mitigating Disruptive WiFi Interference at Airports Airlines in a ruling that the Massachusetts Port Authority cannot restrict WiFi use at Boston's Logan International Airport, but leaves the Port Authority the power to have interference corrected to comply with the interference claim thresholds. The bottom line is, in an ideal world, if such an approach were taken with thresholds established and manufacturers accepted for particular environments such as airports, the mitigation of harmful interference becomes simplified and enforceable in the airport environment. Read the entire page →
From page 67... ... Radio Frequency Primer 67 These incidence reports can be generated by anyone using or working with the WiFi system and saved in a database format (discussed later in this appendix) Read the entire page →
From page 68... ... 68 A Guidebook for Mitigating Disruptive WiFi Interference at Airports building codes, overall safety of employees and passengers, and installation standards for wiring and security. They also introduce questions relating to interference that need to be considered. Read the entire page →
From page 69... ... Radio Frequency Primer 69 device is interfering with a flight navigation or support role, e.g., a repeater, or it is operating outside the Part 15 specifications. The future Airport Network and Location Equipment (ANLE) Read the entire page →
From page 70... ... 70 A Guidebook for Mitigating Disruptive WiFi Interference at Airports originator, report identification with accompanying information on date opened, status of report (opened/closed) , severity of report, actions taken, and other pertinent information. Read the entire page →
From page 71... ... Radio Frequency Primer 71 WiFi equipment, which could be an option at some expense. Once a satisfactory location is determined for the above cases, a first attempt towards resolution could be to have a discussion as to whether the changes would benefit the owner(s) Read the entire page →
From page 72... ... 72 A Guidebook for Mitigating Disruptive WiFi Interference at Airports Conclusions and Way Forward Interference is a complex issue. The determination of the root cause of the interference has to separate the "perceived" from the RF in order to apply the appropriate mitigation. Read the entire page →
From page 73... ... Radio Frequency Primer 73 Attachment 1: Spectrum Management in Its Early Days Spectrum interference management in its infancy state, governed by the Communications Act of 1934, provided "empty frequency space" known as guard bands (Figure A1-1) for adjacent channel protection on one or both sides of the assigned frequencies. Read the entire page →
From page 74... ... 74 A Guidebook for Mitigating Disruptive WiFi Interference at Airports – Spectrum use specifications made resolution of interference part of non-regulatory governance (i.e., users work out the interference issues) , with some exceptions in the unlicensed bands. Read the entire page →
From page 75... ... Radio Frequency Primer 75 References 1. Public Law Number 416, Act of June 19, 1934, ch. Read the entire page →

From page 60...

... 60 A P P E N D I X A One may do Internet searches on "electromagnetic interference" and find many references to the subject. However, they tend to span the range from a Wikipedia explanation of the fundamentals to complex circuitry and radio frequency (RF)