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Leased lines, fiber, and microwave each have benefits and drawbacks in terms of bandwidth, reliability, price, and delivery The tendency is usually very applicationspecific Every case is different in terms of terrain, line of sight, right of way, location of a Bell central office, and so on A mile fiber choice can range in cost between $20,000 and several million dollars, depending on the terrain requiring traversal Similarly, a high-speed leased line can cost $600 a month or $20,000 a month if it crosses LATA or other rate boundaries No one solution fits all possibilities for connectivity Using a wireless connection, the first, full-speed Ethernet speed solution was a major milestone From this innovation, users had viable options, bridging the extremes between leased lines and fiber Many users still limit their choices to the bottleneck of a T1 leased line or overpaying for a T3, which is too much bandwidth for the need Instead, you should find a solution that provides the needed bandwidth for a justifiable cost All three solutions offer high reliability for the most critical connections, although a mission-critical path must be backed up Keep in mind also that the three choices are not mutually exclusive They frequently work well together Microwave handles last mile connectivity to a fiber backbone or serves as a lower-cost, automatic backup as insurance against backhoe fade You should weigh each choice, based on which offers the best cost to benefit ratio Cost includes installation, on-going charges, upkeep, losses due to downtime, and organizational productivity

Figure 10-8 The matrix now has subtotals added for both the rows and columns Some simple formatting has been applied to change the background color for the row and header columns as well as the subtotals

12:

Prior to the 1970s, microwave was the most widely used wireless communications medium in the world Microwave usage is making a comeback now with end users Many user organizations were reluctant to experiment with microwave radio transmission, due to misconceptions surrounding the technology, as well as to confusion between the wireless products It is important to recognize that the difference between one wireless device and another can be as different as fiber and copper wire Both fiber and copper are wired, but that is where the commonality ceases The same is true between microwave and laser, spread spectrum, or cellular service There are even differences between one type of microwave and another The differences are due primarily to their respective operating frequencies Some frequencies are good for distances of 30 or 40 miles and others can barely get you across an office park Some can only support a couple of T1s or a single video channel and others go to 10 45 megabits In Table 17-1 , a comparison of distances and frequencies is used for representative purposes Many times this is the best case scenario Table 17-1: Comparison of frequency bands and distances (line of sight) Frequency 2-6 GHz 10-12 GHz 18 GHz 23 GHz 28-30 GHz Distance 30 miles 20 miles 7 miles 5 miles 1-2 miles

Imagine trying to control the same robot with 12 sticks on the R/C transmitter while trying to do battle with another robot that is speeding toward you The computer-enhanced R/C is crucial to sophisticated mechanical designs

that format by changing the Format property of the subtotal, but in most cases businesses will want the same format as the data it is totaling The reports shown in Figure 10-7 and Figure 10-8 are static, meaning that they do not contain interactivity For example, users cannot see the data at the quarter level for each year, nor can they expand countries into the states or provinces that make up those countries Adding such interactivity to the report is examined next

Private-user microwave systems are essentially the same as what the telephone company, FM radio stations, broadcasters, and fixed-site utility companies relied on before the implementation of fiber For example, the corkscrew type antennas on news vans are shooting microwave signals back to their TV and radio stations as shown earlier FM radio stations still rely mainly on microwave In fact, most microwave radio uses Frequency Modulation (FM) radio technology What can microwave offer an organization Primarily, microwave combines huge bandwidth and reliability that is better than other wireless device In fact, microwave is typically far more reliable than the leased- line specification (99985%) for distances across the street to twenty plus miles away Microwave can deliver bandwidth up to 45 Mbps (and most demanded speeds in between) A properly configured system will sustain operation except in the most severe rainstorm where power and telephone line outages would be expected The myths run rampant with radio-based systems Despite the rumors about the various risks and perils for the radio signal, microwave usually operates 9999 + % of the time Microwave is normally impervious to the following: