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NSCC Executive Summary CBG Communications, Inc. <br /> The major findings and recommendations of CBG's review are outlined in this Executive <br /> Summary,with more detailed information, supporting data and recommendations that <br /> will be provided in a Final Report. <br /> II. Summary of Major Findings related to Comcast's Residential Network <br /> Comcast is operating a Hybrid Fiber Coaxial cable (HFC)network that is designed to <br /> provide video (Cable TV), Internet and data services and telephone services to most <br /> addresses within the 10 members cities comprising the NSCC service area. <br /> CBG reviewed many facets of the subscriber network, including bandwidth(or capacity), <br /> system architecture, system performance, system maintenance and monitoring, and <br /> system facilities. A high level summary of each of these areas is provided below. <br /> • System Design and Architecture <br /> Comcast's system uses fiber optic infrastructure to send and receive signals to/from <br /> nodes located in neighborhoods,throughout the NSCC area,where forward(or <br /> downstream) signals are transformed from light, on the fiber optic infrastructure,to Radio <br /> Frequencies (RF) for insertion onto the coaxial cable infrastructure for ultimate <br /> transmission and distribution to residents and businesses served by the particular node. <br /> Forward(or downstream) services include all analog, standard definition(SD) digital and <br /> high definition(HD) digital channels including Video-On-Demand(VOD). Additionally, <br /> Internet data,traveling from Comcast's headend or hub to subscribers, and telephone or <br /> voice service to subscribers is carried on the forward/downstream portion of the network. <br /> In addition,the nodes receive RF signals from subscribers via the coaxial infrastructure <br /> which feeds these signals into the node. The node converts these signals to light for <br /> transmission,via the fiber optic infrastructure,to Comcast's headend or hub. Some <br /> return signals include upstream data, ordering information for VOD and other video <br /> services as well as telephone traffic. <br /> ii <br />