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limited success because of the proprietary nature of their interfaces and the pricing model they used Technologically, the system was sound Later in the evolution of this service, the term broadband LANs became popularized Ten megabit per second Ethernet grew to 100 Mbps, and then on to gigabit Ethernet Justifying and enabling this high-speed communications service met with some resistance until the use of the various fiber and coaxial systems emerged By taking a quantum leap in the industry, the data and voice departments saw the benefit and need of converging the two services to the desktop in order to offer voice and video over the LAN The 10 Mbps Ethernet and coaxial cables could not handle this offering Enter the new technology! Hybrids of coax and fiber were introduced to the desktop Moreover, with the access to the Internet under constant scrutiny and pressure to add speed and capacity (voice and video on the Internet), the industry began to seek a new method of bypassing the local copper loop provided by the telephone companies The technology already at the door, of course, was the CATV So a new idea emerged: use the CATV to support the high speed Internet access and bypass the local loop from telephone companies Hence, cable modem technology changed the way we will do business for the future

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The cable television companies are in the midst of a transition from their traditional core business of entertainment video programming to a position as a full-service provider of video, voice, and data telecommunications services Among the elements that have made this transition possible are technologies such as the cable data modem These companies have historically carried a number of data services These services have ranged from news and weather feeds, presented in alphanumeric form on single channels or as scrolling captions, to one-way transmission of data over classic cable systems as discussed in 13 Information providers are targeting upgraded cable network architecture as the delivery mechanism of choice for advanced high-speed data services These changes stem from the commercial and residential data communications markets The PC and LAN explosion in the early 1980s was rapidly followed by leaps in computer networking technology More people now work from home, depending on connectivity from commercial online services (such as AOL, CompuServe, and Prodigy) to the global Internet Increased awareness has led to increasing demand for data service, and for higher speeds and enhanced levels of service Cable is in a unique position to meet these demands The same highly evolved platform that enables cable to provide telephony and advanced video services also supports high-speed data services There appear to be no serious barriers to cable deployment of high-speed data transmission

If security in SQL Server or Analysis Services is set up to only show certain data to certain users, it is important to know the originating user of a request; the identity of the SI account isn t good enough In this case, the SI account must take on the credentials of the original calling user In order for the SI account to mimic the original caller, either basic or integrated authentication must be used Next, Kerberos must be installed; this is because it is only through Kerberos delegation that the current user can be impersonated through IIS back to the data source Kerberos allows IIS to take the user token and present that to the data source as the user making the request, and in this fashion SQL Server or Analysis Services can send back just the correct data to the user In many cases, IIS can impersonate the user without Kerberos if both IIS and Analysis Services are on the same server, but if IIS and Analysis Services are on separate machines, this leads to the double hop scenario In this case, the user requests a page from their browser, so data flows from the client machine to the web server (the first hop) The web server now needs data from Analysis Services and makes a call to the server running Analysis Services (the second hop) Even if integrated authentication is used, the user s credentials cannot be passed from IIS to Analysis Services on another server, unless Kerberos is installed and configured When working with PerformancePoint, there is a setting in the webconfig file that must be changed in order to enable impersonation when using Kerberos This property is called BpmServerConnectionPerUser and it must be enabled to allow the impersonation token to be passed This only applies to the Monitoring Server, as the Planning Server is set up to always pass user credentials.

The cable platform is steadily evolving into a hybrid digital and analog transmission system Cable television systems were originally designed to optimize the one-way, analog transmission of television programming to the home The underlying coaxial cable, however, has enough bandwidth to support the two-way transport of signals The hybrid network is shown in Figure 14-4