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<br />The fact that AT&T is sending to the subscriber the specific content that the <br />subscriber requests at a given point in time is what allows AT&T tb provide a video service <br />over significantly less bandwidth than traditional cable service. This significant <br />technological distinction is fundamental to AT&T's Project Lightspeed deployment. AT&T <br />would not be able to offer any reasonable form or amount of video service over the 20-25 <br />MB per second pipe if it employed the same technology and delivery methods as traditi~nal <br />cable television. <br /> <br />IncUmbent cable service is a one-way service in which all the video programming is <br />simultaneously transmitted (i.e., broadcast) to all households connected to the system, and <br />it is the tuners built into customers' set-top equipment that select the appropriate channel to <br />display on each customer's television. Cable systems are thus fundamentally one-way, <br />passive distribution systems. In contrast to the passive, allcat-once broadcast model of <br />cable systems, AT&T's Project Lightspeed switched system involves regular two-way <br />co=unication and interaction between individual subscribers and the network; nothing is <br />sent to the cUstomer until the customer co=unicates and interacts with the IP-enabled <br />services and requests specific content. Moreover, because bther applicatioDB provided over <br />the netWork will also be IP-based, subscribers will be able to tailor and integrate much of <br />the voice, video, and data content. <br /> <br />B-2 <br />