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Faced with these harsh realities and the realization that the existing cable plant could not compete with the telephone network in its original analog incarnation, cable engineers began a major rework of the network in the early 1990s. Beginning with the head-end and working their way outward, they progressively redesigned the network to the extent that in many areas of the country their coaxial local loop was capable of competing on equal footing with the telco s twisted pair, and in some cases beating it. The process they have used in their evolution consists of four phases. In the first phase, they converted the head-end from analog to digital. This enabled them to digitally compress the content, resulting in a far more efficient utilization of available bandwidth. Then they undertook an ambitious physical upgrade of the coaxial plant, replacing the 1-inch trunk and half-inch distribution cable with optical fiber. This brought about several desirable results. First, by using a fiber feeder, network designers were able to eliminate a significant number of the amplifiers responsible for the failures the network experienced due to power problems in the field. Second, the fiber makes it possible to provision significantly more bandwidth than coaxial systems enable. Third, because the system is digital, it suffers less from noiserelated errors than its analog predecessor did. Finally, an upstream return channel was provisioned, as shown in Figure 5-10, which makes possible the delivery of true interactive services such as voice, Web surfing, and videoconferencing. The third phase of the conversion has to do with the equipment provisioned at the user s premises. The analog set-top box has now been
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Figure 5-10 Upstream and downstream channels in modern cable systems.
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replaced with a digital device that has the capability to take advantage of network capabilities, including access to the upstream channel. It decompresses digital content, performs content ( stuff ) separation, and provides the network interface point for data and voice devices. The final phase is business conversion. Cable providers look forward to the day when their networks will compete on equal footing with the twisted pair networks of the telephone company, and customers will see them as viable competitors. In order for this to happen, cable providers must demonstrate that their network is capable of delivering a broad variety of competitive services and that the network is robust. They also must prove that they have operations support systems (OSSs) that will guarantee the robustness of the infrastructure and that they are costcompetitive with incumbent providers. Cable providers must also create a presence for themselves in the business centers of the world. Today they are almost exclusively residential service providers; if they are to break into the potentially lucrative business market, they must have a presence there.
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As cable providers have progressively upgraded their networks to include more fiber in the backbone, their plan to offer two-way access to the Internet has become a reality. Cable modems offer access speeds of up to 10 Mbps, and so far the market uptake has been spectacular. Cable modems provide an affordable option to achieve high-speed access to the Web, with current monthly subscription rates in the neighborhood of $40. They offer asymmetric access, that is, a much higher downstream speed than upstream, but for the majority of users, this does not represent a problem since the bulk of their use will be for
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