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Interview with John Chapman

Chapman, John__smallJohn Chapman, Engineering Fellow and CTO of Cisco System’s Cable Access Business Unit, is a pioneer in broadband communications, having helped to define and write the original DOCSIS (Data Over Cable Service Specification) spec — which spawned the cable modem marketplace, and, consequently, the broadband explosion we’re living in right now. He’s currently leading the development of the DOCSIS 3.1 specification, which promises substantial throughput and speed gains for residential broadband consumers. In this Q&A, he characterizes the highlights of DOCSIS 3.1, why it matters, and current events.

Q. What does DOCSIS 3.1 mean to cable-delivered broadband, as opposed to fiber?


Chapman: Service providers are often under scrutiny in terms of their competitiveness, against fiber-to-the-premise architectures. DOCSIS 3.1 will go a long way in assuaging those misperceptions. It can make that hybrid fiber-coax plant perform as well as fiber, at a fraction of the price of a fiber upgrade. DOCSIS 3.1 is all about getting more bang for the buck – it’s a higher performing, lower cost technology.

Q. What is the biggest changing coming, in DOCSIS 3.1?

Chapman: It’s difficult to identify just one – there are many. In an over-arching sense, it’s a technology and product refresh for cable-delivered IP services. By that I mean it advances the progression to full-spectrum technology, which gives service providers the ability to stripe IP services across the entire cable spectrum, over time. And, it enables more bits per Hertz, on the wire – always good.

Q. Published reports indicate that DOCSIS 3.1 has the potential to create 50% bandwidth increases, in the downstream and upstream signal direction. What does that mean for capacity and speed?

Chapman: It means data rates as high as 10 Gbps in the downstream (home-facing) signal direction, and as high as 2 Gbps in the upstream (network facing) direction.  The capacity angle is quite interesting, especially for the upstream path. DOCSIS 3.1 offers a way to widen that spectral range, to as high as 200 MHz. That’s a quadrupling. Now, it’s a matter of figuring out when, why and how one would do that. But generally speaking, DOCSIS 3.1 is a far-reaching value proposition.

Q. When people talk about DOCSIS 3.1, the term “OFDM” usually is somewhere nearby. What is OFDM?

Chapman: It’s a really cool technology that will allow us to shape the spectrum to fit the downstream, rather than the other way around. It’s cool because it’s infinitely configurable – tens of thousands of tiny, 25 kHz-wide carriers. Mobile carriers already use OFDM, but it’s new to cable providers. They traditionally use Quadrature Amplitude Modulation, or QAM. Our role as a vendor is to find a backwards-compatible way to augment a provider’s modulation portfolio with OFDM, without disaffecting the installed base of QAM.

Q. What’s the current status of DOCSIS 3.1?

Chapman: Well, we just sequestered ourselves in Denver for a most of a week – It’s a really high-energy group. I’d say we’re seeing the light at the end of the tunnel, in terms of having a completed 3.1 specification. Then we can all start building product. I think it’s safe to say that most vendors anticipate product in the marketplace in the 2015 timeframe.

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Rovi creates innovative technologies that connect people and digital entertainment. Reaching millions of consumers through popular applications, devices and websites, Rovi helps global consumer electronics manufacturers, service providers, content producers, retailers and advertisers provide a better entertainment experience at home and on the go. With unparalleled entertainment data, industry-leading media guides and storefronts, high quality video playback solutions, a multi-platform interactive ad network and more, Rovi covers the digital entertainment ecosystem with both custom and cloud-based products that bring consumers closer to the TV shows, movies, music and games they love. Learn more at www.rovicorp.com

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TiVo, the leading consumer TV product provider, offers best in class user-interface, enterprise video services and seamless delivery of broadband and broadcast content to every video screen in the home. TiVo’s intuitive experience offers consumers the ability to effortlessly aggregate, search and navigate one user interface to enjoy the best digital entertainment content available today. For pay TV operators, TiVo delivers proven financial benefits with increased ARPU, higher customer satisfaction and reduced churn. The TiVo hosted service provides a whole home solution across TV, mobile and tablet platforms, in addition to traditional set-top boxes.  Distribution partners include:  Cable One, Charter, Comcast, Com Hem, DirecTV, GCI, Grande, Mediacom, Midcontinent, Ono, RCN, Suddenlink, and Virgin.


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With more than 40 years of innovation in the IC industry, Intel brings the benefits of its established CPU architecture and its world-leading process technology to the cable industry in the form of system-level ICs for data and video gateways. High performance Intel®AtomTM processors at the heart of its cable gateway System on Chip products are delivering an exceptional user experience, with proven Intel®AtomTM processor virtualization technology set to further accelerate the way service providers can deliver and monetarise new services. Intel is proud to be a sponsor of the 2013 Cable Congress. www.intel.com

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NAGRA, the digital TV division of the Kudelski Group, provides security and multiscreen user experience solutions for the monetization of digital media. It offers content providers and DTV operators worldwide with secure, open, integrated platforms and applications over broadcast, broadband and mobile platforms, enabling compelling and personalized viewing experiences. Please visit www.nagra.com/dtv for more information and follow us on Twitter at @nagrakudelski.

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Teleste is an international technology group providing HFC and deep fibre solutions and comprehensive network planning and maintenance services for leading cable operators in Europe.

In 2012 our net sales was EUR 194 million and Teleste employed 1325 persons

The company is listed on the NASDAQ OMX Helsinki Ltd.

Visit www.teleste.com for more information.

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Farncombe is the leading independent specialist digital TV consultancy, providing world-class strategic advice, engineering and design services to clients across the digital TV and entertainment value chain. Farncombe’s experience in digital TV is unrivalled, focusing on the commercial opportunities in multi-platform, multi-screen and hybrid IP TV delivery. Founded in 1991, the company now has offices in the UK, France and Germany, and is recognised as an innovator driving the industry forward and the ‘go-to’ source for independent and authoritative strategic counsel. Farncombe’s international client roster includes amongst others: Arqiva, Broadcom, BSkyB, BT, Irdeto, Kabel BW, NAGRA, NDS, Ofcom, SABC, Top Up TV, UPC and YouView. For further information, visit www.farncombe.com.

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