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__. i i ir��rr. - <br /> ��,v+1 � <br /> B-1 <br /> EXHIBIT B <br /> (1) Description of System <br /> The system RCN Telecom Services of California, Inc. ("RCN") will <br /> construct in the City is a Hybrid Fiber Coax ("HFC") design. The RCN network is <br /> being designed and built with minimal active electronics per node and will <br /> accommodate a full 110 channels of analog signals at 860 MHz. <br /> RCN will install a Hub in the City that will be connected by single mode <br /> fiber optic cable to RCN's Telecommunications Center ("TC") located at 200 Paul <br /> Avenue in San Francisco. The system backbone connections will utilize fiber <br /> optic links (TC to Hubs, Hubs to Hubs, Hubs to nodes). The system will be <br /> designed and engineered with redundant paths between the TC and the Hub. <br /> RCN will use a dual laser concept that would provide automatic back-up of the <br /> optical system. Upon sensing a loss of signal, this switching system will <br /> automatically switch to an alternate laser and fiber cable to permit uninterrupted <br /> service to the City. A typical RCN Hub will consist of optical receivers and <br /> Distributed Feedback ("DFB") lasers. Each DFB laser will serve no more than <br /> four (4) nodes. The typical optical node will serve approximately 150 homes. <br /> The system will be designed and constructed to be an active two way <br /> plant utilizing the return bandwidth of 5-40 MHz to permit such services as <br /> impulse pay per view and other interactive services. These return signals will be <br /> transmitted back to the primary Network Operating Center (NOC) or Hub using <br /> the optical return laser in the node. <br /> All of the optical components will be monitored at the local system level as <br /> well through RCN's centralized NOC to ensure constant surveillance. This same <br />