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Figure 17-7: Repeater space can be rented from other suppliers This assuages the fact that line-of-sight is a major drawback Anyone who has ever negotiated right-of-way for fiber knows how tedious that can be With fiber, the right-ofway includes the entire physical length of the cable or conduit required for the connection With microwave, the concern is limited to a few physical points where the dish placement will occur and a few legal issues Another perceived drawback of microwave, aside from price and line-of-sight, has to do with getting and maintaining the license to use Licensing is a protection for the end user It is a tedious process that provides structure and prevents interference and overlays in the frequency spectrum Most organizations see this as a step for governmental control, but if a conflict arises, it can be the salvation for the licensed user License gives you the right to use a good, clear transmission path, and that is definitely positive The FCC is quite efficient in approving licenses for private users, and spectrum is readily available for point-to-point applications Licensing involves contracting someone to do a frequency search and filing a FCC license application The frequency search is to find unused, available frequencies Those frequencies are then reserved and filed, along with other pertinent data, on the appropriate FCC form The process is normally completed within a few days, and it can cost $2,000 to have your vendor handle it for you An experienced vendor can usually assure that the FCC will grant your license by avoiding amateurish mistakes The 23 GHz frequency band, for example, is a very common frequency band for shorthaul, private-user microwave systems Most people confuse the band with the actual operating frequency The 23GHz band actually consists of 24 pairs of frequencies, ranging between 21200 and 23600 GHz The number can be doubled to 48 pairs of frequencies with minor antenna changes (changing polarization from vertical to horizontal).

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The radio signal is narrowly focused by the antennas at each end of the link, and transmit power is only about 60 milliwatts These variables make it possible to use identical frequency pairs for two links originating from the same rooftop! By changing the polarization of the antennas and separating the signals, 10 degrees should provide the necessary separation and isolation When connecting LANs together with microwave radio systems or bridges, the important issue is selecting the right vendor The vendor s qualifications and experience in both the LAN and microwave systems are paramount Does the vendor possess the expertise to differentiate a network or bridge failure from a radio problem Can the vendor provide turnkey services and assume total system responsibility The correct vendor will ensure the successful implementation of a LAN microwave link

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18: Local Multipoint Distribution Services (LMDS)

In some cases, it may not make sense for a parameter to allow multiple selections Developers are able to control the type of list that is used for a report by clicking on the Data or Layout tab and then selecting Report Parameters from the Report menu The Report Parameters dialog box that appears contains many options for controlling how parameters are used and displayed on a report For example, parameters have a name and a data type, though while these options are important, they are invisible to end users The Prompt property, however, controls the text the user will see on the report next to the drop-down list Therefore, this prompt could be changed from Category to Product Category, for example, to help make it more clear Beneath the Prompt textbox are a number of check boxes, and one that is checked by default when building a parameter in Reporting Services against a cube source is the Multivalue check box Unchecking this particular box changes the parameter drop-down box so that users can make only a single selection from the list Allowing only a single selection removes the (Select All) option from the list, but the All Products element will still exist, since the query generated for parameters includes the All member by default In some cases businesses may decide not to have the All member in the list This is most often done with parameters that allow multiple selections, because having both the (Select All) option and then an all members item is confusing for end users Getting rid of the All member is a matter of modifying the query that was created when the Parameters check box was clicked Remember that one of the things that will happen when you click the Parameters check box is the creation of a new dataset to fill the parameter list You can see this new dataset by clicking on the Data tab and then looking at the Dataset list The dataset will have the same name as the default name of the parameter After selecting the query, notice that it creates a number of columns, such as ParameterCaption and ParameterValue In the query, these columns are placed in the Columns clause in the query, but the Row clause contains the dimension, hierarchy, and then the AllMembers function In MDX, the AllMembers function returns all members including calculated members and the All member If companies choose to remove the All member, the query can be changed, replacing AllMembers with the Children function.