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NSCC Executive Summary CBG Communications, Inc. <br /> should then perform the necessary troubleshooting to determine the cause of the problem <br /> and make the correct repairs. This may include replacement or tightening of connectors <br /> and the replacement of cables to name a few possible solutions. <br /> • Standby Power <br /> Standby power provides the system with the capability to remain operational when <br /> commercial power is lost for any period of time. Comcast employs several backup power <br /> methodologies, from the headend and hub to the power supplies located on the <br /> distribution system in the field. <br /> Comcast has large backup generators located at both the headend and hub. These are <br /> designed to provide enough power to keep the headend and hub operational in the event <br /> of a power outage at these locations. In addition, because there is a lagtime of several <br /> seconds between the loss of power and the generator coming fully on-line, Comcast also <br /> has large banks of batteries that are designed to provide power to all headend equipment <br /> that operate on -48VDC while continually being recharged as normal procedure. When <br /> power is lost,these battery banks will continue to provide power,without any outside <br /> power, for a minimum of 8.5 hours. For all critical equipment that operates on 120VAC <br /> power, Uninterruptable Power Supplies (UPS) are in place to run this equipment until the <br /> back-up generators are operational. <br /> Comcast has power supplies located on the distribution plant to provide power to the <br /> nodes and amplifiers used in the field. These power supplies are equipped with batteries <br /> that provide backup power in the event of a commercial power outage. Based on <br /> information provided by Comcast,these power supplies are capable of running,without <br /> commercial or other power sources, for a minimum of 6 hours. This run time will <br /> increase based on lower power needs at some power supply locations. <br /> Our review of Comcast's documentation does not indicate a large number of outages or <br /> an overall pattern of longer than acceptable repair times when outages occur. <br /> vii <br />