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Cablevision/Mayfield Village Franchise Agreement 2000 <br />Page No. -25- <br />EXHIBIT "D" <br />SYSTEM ARCHITECTURE <br />Grantee has built the current state of the art H.F.C. (Hybrid Fiber Coax) system employing fiber <br />to the serviced area architecture: When fully deployed, the cable system will have a minimum <br />bandwidth of 550 MHz in the forward direction capable of delivery when construction is <br />completed of 77-80 channels, or a combination of analog and digital services. The system is <br />organized through layers of headends, digital hub sites. and fiber optic nodes. <br />The central headend is configured where possible for redundant backup equipment for signal <br />processing and satellite delivered signals. Commercial power is backed up by standby <br />generators capable of operating the headend for indefinite periods. The central headend is also <br />the monitoring point for transmission quality of subscriber signals and is the primary operations <br />point for system network performance monitoring. <br />Programming information received at the headend is transported either to-fiber optic nodes in <br />analog format or to digital hub sites transmitted in an uncompressed digital format. Signals that <br />are transported to the digital hub sites are sent through a fault to tolerant ring. The digital hub <br />monitors signal loss while the ring provides automatic rerouting of signal by switching to an <br />alternate source. Each hub site is backed for loss of commercial power by a standby generator <br />capable of operating the hub site for an indefinite period of time. The status and performance of <br />each hubsite will be monitored at the central headend by the system network performance <br />monitor. - <br />Programming is ultimately delivered to the customer through a hybrid combination of a fber <br />node, coaxial cable and fiber to the service area. System design is configured io limit the <br />number of potential homes served by a signal node to 500 - 1500-comes. All system and power <br />supply will have a status monitoring module integrated into system network performance <br />monitoring. - <br />M & M 1999 Page 25 of 28 <br />