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Having proven that the bandwidth and reliability are readily available on a microwave system, most people look for the negative side of private microwave The unaware consumer assumes that there must be some gotcha lurking in the background One technology cannot be the most robust and reliable and yet not be the most favored There has to be a major drawback to using microwave The two largest drawbacks have always been the availability and the sticker price Microwave appears to be the most expensive wireless option (typically, between $20,000 to $100,000 for an end-to-end link) However, if greater bandwidth and reliability are the goals, then microwave is not as expensive as it appears superficially The initial up-front cost avoids the bandwidth and reliability tradeoff with less expensive or less robust technologies If a critical connection requires high bandwidth and high reliability to prevent catastrophic losses from downtime, then more money is required initially The old saying pay me now, or pay me later applies here Another perceived drawback (handling over a megabit per second) is the requirement to have line-of-sight between locations Line-of-sight issues are rarely showstoppers First, only a small part of the remote site needs to be visible Even if the other site is not visible, solutions exist Actually, this is quite common Look for high points that can be used to get visibility between both sites A passive or active repeater site can be implemented Setting up a repeater is not difficult, particularly with passive repeaters The antennas are small and lightweight enough to be placed almost anywhere; a water or radio tower, utility pole, other rooftops, and so on An alternative is to bounce the signal off a physical obstacle (such as a mountain) and use obstacle gains the get the signal through (see Figure 17-6 ).

The Robo-Goose uses one-way communications to control the robot If you drive the robot out of view around a clump of trees, you will have little luck in driving the robot back into view because you have no feedback from the robot The Rover was designed to give more feedback to the controller both visually and through force feedback The Rover uses a variety of controls to not only convert the inputs from the controller into the actual motion commands, but also to provide important feedback information to the operator This allows the Rover to drive completely out of view from the operator at great distances The feedback the operator gets allows the Rover to be quite robust in operation, even in confusing and difficult-to-navigate environments Figure 12-9 shows a photograph of this robot Rover is manipulated via a traditional computer game controller (joystick) The commands given by the operator as she manipulates the joystick are translated in software into the commands for the motors that operate the four-wheel-drive arrangement of the rover s wheels These translated commands are passed over a wireless computer network to a small hand-held personal data assistant (PDA) situated on the robot, where more processing takes place The commands are then sent via serial communication to two networked BrainStem controller modules that control the motors

If a repeater is needed, rental space is often available on other towers This is true in long haul but also in localized communications Renting space on an existing tower or a rooftop is not very dramatic Leased space typically costs $200 per month per dish Repeaters are shown in Figure 17-7

Figure 10-9 The query for the sales report now has a filter added to it, and the filter is marked to be used as a parameter

12-9

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In Figure 10-9, a parameter has been added for product categories This means that end users will be able to select one or more product categories and see the sales data for just the selected categories Inside the original query, changes were made that will now only retrieve from the cube the data that matches the selected parameters; in other words, the query does not retrieve all the data and then filter it locally; instead, Reporting Services is smart enough to write the query to only ask for the data necessary for the report Figure 10-10 shows what this parameter looks like when previewing the report, which is also the way it will look to users at runtime in the web interface You should notice two things about the parameter: the list allows for multiple selections and that there is a (Select All) selection as well as an All Products selection Developers have the ability to control whether or not a parameter allows for multiple selections, and they can modify the query to control whether or not two All choices show up in a multiple selection list

A tele-operated robot named Rover provides video feedback to the operator as to its actual position (courtesy of Acroname)