Cable Television and Broadband Trends for 2014
Recently, operators have effectively reclaimed
available spectrum by converting to an all-digital video lineup and using
switched digital video (SDV). The emergence of over-the-top (OTT) video
services like YouTube, Hulu and Netflix, combined with the prevalence of mobile
devices (smartphones, tablets, laptops) accessing the network, is creating a
surge in data demand. Operators must meet this demand and the only way to
provide the necessary bandwidth is by evolving the network. Current networks
still have substantial bandwidth capacity potential. It can be enhanced through
key network changes; however, if operators plan to stay competitive and support
future growth, they must devise a plan that evolves the network from a hybrid
fiber/coax networks (HFC) platform to a converged optical platform delivering
Ethernet/IP-based services to the user.
Network evolution will vary from operator to operator. It will be based on available capital, competition and the current state of the network; however, migration phases will drive at least four key changes in the network.
Fiber is Migrating Deeper into the Network
Today, operators are serving between 250 and 1,000 homes perHFC node as the norm. This level of bandwidth sharing creates congestion and over subscription during peak demand periods. To improve speed and capacity during peak periods, operators must continue to split nodes and create smaller service group sizes. This decision is based on usage with a focus on subscribers who generate higher average revenue per user. Node splits will shrink service groups over a period of time to a range of 64 to 250 homes.
Operators must make their networks and network management systems more efficient. One way is to eliminate duplicate network engineering efforts. By eliminating service group separation, operators can simplify the headend. A universal platform, capable of supporting carrier channels for both video and Data Over Cable Service Interface Specification (DOCSIS), provides the maximization of available spectrum and eliminates the need for a large portion of the combiner function in the headend. A single platform also generates significant savings on space and power requirements.
Increase Upstream Bandwidth
The biggest limitation of current network architecture is the potential for upstream bandwidth capacity. Deep fiber architectures and unity gain drop amplifiers support the use of four-channel configurations by overcoming the noise floor challenge; however, demand requirements will quickly outstrip the network's capacity of 160Mbps. The bottom line is the mid-split needs to move to free up more upstream capacity to accommodate subscriber demand. The decision to move the mid-split is not easy and will require significant network investment.
With an increasing trend towards a long term conversion for an all Ethernet /IP service delivery, video formats are rapidly evolving and will start the evolution from analog and digital MPEG formats to IPTV-based formats capable of supporting multi-screen device and time shifted viewing. While IP video formats run over DOCSIS channels, operators can also insert additional IP video channels directly into the universal edge quadrature amplitude modulation (QAM) or carrier rather than using the more costly CMTS (cable modem termination system) ports alleviates network congestion. The concept of maintaining separate video channels for operator inserted content also maintains a level of value in content subscription for the consumer.
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About the Author
Richard "Ric" Johnsen
John Richard “Ric” Johnsen is Vice
President of Outside Plant Solutions for CommScope, a global leader in
infrastructure solutions. Mr. Johnsen joined
CommScope in 2010 and was senior vice president of the Broadband division.
Previously, he was president and chief executive officer of Alloptic. His prior
work experience includes time at OFS as a vice president with responsibilities
for fiber optic cable sales, marketing and product engineering.
During his tenure at OFS, he
led the team responsible for developing and introducing the totally “dry” loose
tube fiber cable design to the market. He also worked
at Alcatel where he served in numerous positions including engineering, operations
and sales. His last position at Alcatel was vice president of the optical fiber
business for Europe and Asia. During his time at Alcatel, he led the
team responsible for developing and commercializing a colored coating for
optical fiber (ColorLock). The project was recognized by Alcatel as the winner
of the 1998 Alcatel “Hi-Speed” Award for speed of execution and impact to the
business. Mr. Johnsen served 11 years in the United States Army, serving in numerous positions globally as a Signal Corps Officer
and holding Airborne and Ranger qualifications.
Mr. Johnsen has a BS degree in general engineering from the
United States Military Academy in West Point, NY and an MS degree in
communications engineering from the United States Naval Postgraduate School in