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Figure 13-6: Combining multiple streams on a single DTV channel The transmission layer modulates a serial bit stream into a signal that can be transmitted over a 6 MHz television channel The transmission system is based on a trellis-coded, 8level Vestigial Sideband (VSB) modulation technique for terrestrial broadcasting ATSC standard-based encoding systems are one of the key elements in DTV implementation Encoding systems will be used in the entire broadcast chain However, not every encoder in DTV broadcast chain has to be ATSC standard-based It should be noted that the FCC standardizes only the terrestrial-broadcasting signal Cable operators are not required to adapt to this standard In addition to the source coding, compression, and multiplexing, an encoding system provides ATSC standard-based systems information, program guide, data, and interactive services along with video and audio The ATSC DTV standard, as well as MPEG 2, describes the bit stream syntax and semantics The standards also specify the constraints and decoder models However, encoding parameters are not specified by the standards Thus, encoder performance and systems implementation are left to encoder designers Thus, standard compliant does not guarantee encoder performance

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In a standard 750 MHz system, consisting of a 5-40 MHz return bandwidth and a 52-750 MHz forward bandwidth, downstream broadcast services occupy the 52-550 MHz pass band The remaining 200 MHz is reserved for digital services The system s analog broadcast services consist of analog nonencrypted services (basic), analog encrypted premium services, and analog pay-per-view services The digital broadcast services include digital audio programming, along with encrypted digitally compressed video programming Several different services, such as interactive video, cable modems, and Hybrid Fiber Coax (HFC) telephony, make up the interactive services Cable modem equipment utilized a two-way RF system with 64 QAM modulation in the downstream direction and QPSK modulation in the upstream direction Data rates for the downstream and upstream paths were 27 Mb/s and 17 Mb/s, respectively Using the system bandwidth information shown earlier, the available bandwidth in the downstream direction is 698 MHz Both broadcast and interactive services use this bandwidth Available upstream bandwidth is limited to 35 MHz, assuming that the entire 5-40 MHz bandpass is useable Migration strategies for the network must be carefully planned Selection of downsizable architecture is crucial in this planning process Also, conducting detailed traffic studies about these services when they are first offered in the network is crucial CATV operators are currently in the limelight and will remain there for some time to come The emphasis on access to the door, deregulation and merger mania in this industry has propelled the CATV operators into one of the driver seats of technology Whether they choose to adjust to their newfound popularity or be gobbled up by new players looking for access depends on the individual cable operator across the country (and the world)

There are a number of places that security can be applied to when dealing with PerformancePoint Server These include standard network security, using NTLM or Active Directory, IIS security, SharePoint security, and security in SQL Server and Analysis Services This next section will assume that standard network security has been set up and that you can log on and is a member of some groups on the system Upon launching Internet Explorer, the user attempts to access a SharePoint site hosting a PerformancePoint Dashboard this is where security issues enter the picture