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1 Are MW links expensive to deploy Not necessarily; the cost of point-to-point (PTP) microwave links can vary and will depend on a number of factors (distance, capacity, con guration, etc) In most cases it will prove to be a cheaper solution than leasing multiple T1/E1 circuits in just over a year 2 Is leasing T1/E1 circuits much faster than designing, installing, and licensing microwave links
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Some of these questions were discussed in technical papers I wrote for Communications Infrastructure Corporation in 2008
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Not any longer; the split con guration MW radio (with indoor and outdoor unit) is very easy to install, and the licensing process can be accomplished in a matter of days (much faster than what it used to be) On the other hand, dealing with local carriers to lease T1 circuits can be a very time-consuming process and may require time and expenses due to the additional installation requirements (that is, construction charges) 3 Is leasing T1/E1 circuits an option in the next generation (4G) of wireless networks No; many predict requirements of over 30 Mbps per cell site in 4G networks This means that, from a leasing prospective, you would have to lease an equivalent of DS3 to every cell site, which is a very unlikely scenario Some carriers are constructing ber facilities all the way to the cell-sites, making that another feasible option in addition to microwave links 4 What is a millimeter wave band A millimeter-wave band is de ned as a 30 300-GHz band 5 What is a National Radio Quiet Zone There are some areas in the US where some or all wireless communications are prohibited The Radio Quiet Zone in Western Virginia is home to the National Radio Astronomy Observatory s Green Bank Telescope, capable of receiving the quietest radio signals in the universe The telescope is so sensitive that only diesel-fueled cars are allowed on the property because even spark plugs emit radio frequencies that can wipe out the signals from space The Zone also provides electromagnetic protection to a secretive Navy research facility at Sugar Grove that monitors communications here on Earth The FCC has set up a similar radio-coordination zone in Puerto Rico to protect a telescope in Arecibo Not all radio transmissions are prohibited in the Radio Quiet Zone; exceptions to these restrictions are usually determined on a caseby-case basis, with preference given to public safety concerns Europe also has a number of radio quiet zones set up in different countries with individual legal and management arrangements 6 Are free-space laser communications systems a competition to microwave systems No Free-space laser communications systems are wireless connections through the atmosphere using the optical part of the frequency spectrum and therefore cannot be categorized as either wireless or a wireline system in a classical sense They work only under clear line-of-sight conditions between each unit, eliminating the need for
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securing rights of way, buried cable installations, and government licensing Rain and snow can cause attenuation of up to approximately 40 dB/km and 100 dB/km, respectively, while in an extremely heavy fog attenuation as high as 300 dB/km has been reported Microwave systems are typically not affected by snow or fog 7 Should we use path surveys or just try to establish a line-ofsight That will depend on the situation; for example, in a city where mostly rooftops are used for the wireless sites, LOS using mirrors and/or balloons could be suf cient (and recommended) method for links below a few miles in length In urban and suburban areas where there are lots of trees and links could be longer, detailed path survey and obstacle height measurements are required On a 30-mile backbone (high-capacity) links, path survey is the only option Again, there is an exception to that rule as well, for example, links in the desert or over-the-water links, assuming we can climb high enough to overcome the earth bulge 8 Is it possible to install microwave equipment on a ag pole or a light pole It is possible, although that is not a preferred solution; it can only be done if the twist and sway (ie, how much the structure moves under high wind conditions) is suf ciently low for that antenna size and frequency of operation Some ag and light poles are specially designed and manufactured for carrying cellular and/or microwave equipment 9 Are microwave links hazardous to our health No, unless you are directly exposed to microwave radiation (standing directly in front of the antenna for an extended period of time); microwave antennas are typically located high above the ground, and due to the high directivity of the microwave dish antennas, the intensity of radiation on the ground is negligible For more information see the safety bulletins and publications at: wwwfcc gov/oet/rfsafety/ (accessed Oct 13, 2009) 10 What is a typical price of the installed microwave link It is very dif cult to de ne a typical price of the microwave link Prices can vary anywhere from a few thousand dollars to hundreds of thousands of dollars It will depend on the radio capacity, path length, tower requirements/modi cations, diversity scheme, con guration/protection, special requirements and custom manufacturing (custom painting of the antenna, for example), etc
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