& cplSiteName &

Going All IP

John Holobinko
3/24/2014
100%
0%

As networks evolve towards all IP, the ability to commoditize most network functions becomes economically appealing. To understand why the SDN may provide the greatest benefits at the metro network level requires an examination of the network bandwidth and economic challenges in the network core, metro, and access.

"Over-the-top" (OTT) video viewership is rapidly growing and putting great demands on existing network capacity. According to The Ethernet Alliance , network bandwidth is growing at a 59% rate annually. If the future IP network is to deliver virtually all video services, it must be capable of personalizing the video content.

Cable operators have two choices: install customer devices that mimic the functions of the Internet by performing such functions as caching and personalization in the home, or provide these as network functions. Network devices on customer premises will always be challenged by the inability to capitalize on ongoing economic improvements and difficulties in supporting evolving consumer devices, plus cost and deployment times. Velocity -- defined as how fast a provider can react to changing customer behaviors and economics -- will almost always be greater when more functionality is in the network rather than the customer premises.

A major goal of SDN is to both simplify and consolidate network functions, replacing specialized hardware with commodity switches, servers, etc. It enables vertical integration with application control over the network through SDN APIs. Utilizing SDN has the potential to improve service provider velocity and deliver better network economics. But where to implement SDN: the core; the metro edge; the access network?

Today's OTT viewing represents just a very small fraction of total overall consumer video viewing. If all broadcast and unicast video services must traverse the core, then it becomes a major bottleneck, and core capacity would need to expand by two orders or more. Core equipment is expensive, is highly risky to update, and has limited vendors whose equipment primarily uses specialized hardware rather than merchant chips. Thus, it doesn't make economic sense to use the core to deliver the personalized (unicast) services capability required in an all IP network, and therefore it is not the first candidate for SDN.

Access networks must deliver all services to/from residential and business customers. As video traffic explodes, access networks will need to accommodate all of this growth. Twisted pair, coaxial, and multiple fiber technologies are found in the access network, each with its own phy layer and connectivity requirements. Within fiber, there are multiple options such as EPON, GPON, switched Ethernet, and RFoG, for delivering residential and/or business services. It doesn't make sense to create SDN functions that are specialized for each access technology.

Between the core and access networks sits the metro network. 10G Ethernet transport and10G Ethernet switching are becoming cheaper by the minute. A wise sage said, "Never bet against Ethernet". Ethernet switches are simple and easy to make reliable even in outside plant installation, enabling low-cost extension of the metro network. Extending the metro using low-cost Ethernet transport and switching allows the access network to be much dumber and shorter, potentially driving down the cost of adding access capacity.

In this model, the metro becomes the place where the backbone terminates, provides local processing, and then, using switched Ethernet, connects over distances of tens of kilometers to the last few hundred meters of each specialized access network. It becomes logical to put the functions for IP services personalization at the metro network edge. Therefore, the metro network becomes the logical location for SDN functions.

Most network services can be software-defined utilizing commodity servers and switches. By using SDN in the extended metro, existing access networks can potentially become highly agnostic, with service functions instantiated to subscribers via SDN. Everything from DVR-like functionality to MEF-based services can be provided from the metro network.

There will likely be some service functions that require specialized hardware for many years. Examples include deep-packet classification and traffic-shaping functions (such as those that make up part of the cable network's DOCSIS specification), certain forms of encryption, etc. These specialized functions belong at the metro network edge as well.

As services delivery moves to all-IP, all services, whether residential or business, become IP streams, with their primary differences related to bandwidths, tolerable packet losses and latencies. Transport of business services and residential services over a single metro network becomes viable, despite very different QoS requirements. Network expansion costs can be minimized and service velocity maximized.

— John Holobinko, Independent Consultant

(2)  | 
Comment  | 
Print  | 
Newest First  |  Oldest First  |  Threaded View        ADD A COMMENT
craigleddy
50%
50%
craigleddy,
User Rank: Blogger
3/25/2014 | 8:21:59 AM
Re: Hitting the nail on the head
Hey John:

Great column. One of the first questions with SDN is defining what the heck it really means. In terms of cable infrastructure, which equipment or functions could be replaced or enhanced by SDN?

The large MSOs are moving toward all-IP delivery and cloud TV. Does SDN require them to change their current game plans or will it become a natural part of their IP migration?      

Hope to see you at LR Cable Next-Gen.

Craig Leddy

 

 
t.bogataj
50%
50%
t.bogataj,
User Rank: Light Sabre
3/24/2014 | 1:04:50 PM
Hitting the nail on the head
Congratulations, John, excellent points. (Not really related to "going all IP" though; more relevant for service delivery, related business models & telco benefits.)

Mostly forgotten about, the metro/aggregation segment is actually an area where the telcos will truly be able to see the benefits of SDN in their broadband (i.e. service-delivery) networks.

I agree that this network segment will require specialized hardware rather than COTS servers and switches; but not because of specific service functions (of which you name a few), but for reliability, avaiability and (most of all!) migration scenarios... which represent another neglected aspect of the SDN hype.

It would be interesting to see other opinions. If none appear, we are both right :)

T.
More Blogs from Column
In this final blog of a three-part series, Jeff Gordon examines what operators hope to gain from going down the converged service layer route.
SDN and NFV are more than just networking acquaintances, believes Open Networking Foundation (ONF) Executive Director Dan Pitt.
As niche OTT services abound, they could shatter the business model for the pay-TV industry's traditional fat bundles.
In the second of a three-part series, OpenCloud's Jeff Gordon delves deeper into the driving forces for adopting a converged service layer.
Edge computing is a compelling option for telcos looking to balance tightening finances with increasing demands for bandwidth and processing speed. 
From The Founder
The more things change, the more they stay the same for Juniper's next-gen comms solutions, and that's a good thing.
Flash Poll
Live Streaming Video
Charting the CSP's Future
Six different communications service providers join to debate their visions of the future CSP, following a landmark presentation from AT&T on its massive virtualization efforts and a look back on where the telecom industry has been and where it's going from two industry veterans.
LRTV Interviews
Rogers: Millennials Prefer Mobile Video

7|1|16   |     |   (0) comments


Rogers' Upinder Saini explains how millennial viewers favor mobile devices over big TVs and non-conventional TV content over broadcast and cable networks.
LRTV Custom TV
ZTE Pre5G & 5G Solutions

6|30|16   |   02:23   |   (0) comments


At 5G World London, ZTE demonstrated two types of equipment, including 128 antenna Pre5G Massive MIMO and 15GHz high-frequency base stations.
LRTV Custom TV
Energy 2020: Technology Innovation to Fuel Power Efficiency

6|30|16   |   07:21   |   (0) comments


Managing energy costs and consumption as cable operators deploy new services requires new levels of innovation from technology partners. In this video, Dave Fellows, co-founder and CTO of Layer3 TV and chief scientist of the SCTE/ISBE Energy 2020 program, discusses such ambitious objectives as achieving a second 500% increase in efficiency in outside plant ...
LRTV Custom TV
Transitioning to Service Agile Networks

6|30|16   |     |   (0) comments


Packet optical networks are transitioning from proprietary converged systems to open disaggregated platforms. This video will describe the Fujitsu 1FINITY disaggregated platform, explore how 1FINITY interoperates with the Fujitsu FLASHWAVE platform and explain how 1FINITY is designed for software control, like with Fujitsu Virtuora NC.
Women in Comms Introduction Videos
Nokia's Advancement Plan: Bring Old Skills to New Roles

6|29|16   |   7:57   |   (1) comment


Nokia's Sandy Motley advises women to change their mindsets; get aggressive about advancing their careers; develop strong, diverse support networks; and always bring forth learned skills to take on new challenges and different roles.
Between the CEOs
CEO Chat: Cisco's Yvette Kanouff

6|28|16   |     |   (0) comments


In Silicon Valley, Steve Saunders sits down with Cisco's Yvette Kanouff for an exclusive in-depth interview.
LRTV Interviews
Comcast: Prepping Next-Gen Video Services

6|28|16   |     |   (0) comments


In this LRTV interview, Comcast's Elad Nafshi outlines where MSO stands with cloud DVR, OTT video, college and gigabit services.
LRTV Custom TV
Energy 2020: Creating Unique Standards for Cable's Unique Networks

6|28|16   |   09:30   |   (0) comments


Cable's unique network requirements require a specific set of standards for operators to increase power efficiency, according to Dan Cooper, vice president of critical infrastructure for Charter Communications and chair of the SCTE/ISBE Standards Program's Energy Management Subcommittee, and Ian Oliver, managing director of the Trenchant Group and a member of the ...
LRTV Custom TV
Masergy: 'Now Is the Time for NFV'

6|28|16   |     |   (0) comments


Hear Ray Watson, VP of Global Technology at Masergy, talk about the advantages that enterprises can leverage using Network Function Virtualization (NFV), and how Masergy takes a unique approach to solving customers' problems. For more information on Masergy, please visit www.masergy.com.
LRTV Custom TV
Masergy Leads the Charge With NFV Capabilities

6|28|16   |     |   (0) comments


Hear Tim Naramore, CTO at Masergy, talk about how focusing on solving specific customer challenges, providing self-service automation tools and being laser focused on the customer experience has enabled Masergy to be a leader in the NFV space. For more information on Masergy, please visit www.masergy.com.
LRTV Custom TV
Private Company of the Year - Affirmed Networks

6|27|16   |     |   (0) comments


At BCE 2016, Steve Saunders speaks to Hassan Ahmed about Affirmed's success.
LRTV Custom TV
Energy 2020: Growing Services, Not Consumption

6|24|16   |   07:18   |   (0) comments


Management of power requirements needs to be a key consideration as cable operators deploy new services, says Dan Cooper, vice president of critical infrastructure for Charter Communications and chair of the SCTE/ISBE Standards Program's Energy Management Subcommittee. In this video, Cooper discusses the importance of cable operators and technology partners ...
Upcoming Live Events
September 13-14, 2016, The Curtis Hotel, Denver, CO
November 3, 2016, The Montcalm Marble Arch, London
November 30, 2016, The Westin Times Square, New York City
December 6-8, 2016,
May 16-17, 2017, Austin Convention Center, Austin, TX
All Upcoming Live Events
Infographics
A new survey conducted by Heavy Reading and TM Forum shows that CSPs around the world see the move to digital operations as a necessary part of their overall virtualization strategies.
Hot Topics
Brexit: It's Hard to See an Upside
Ray Le Maistre, Editor-in-chief, 6/29/2016
Qualcomm Readies Lower-Band 5G Testbed
Dan Jones, Mobile Editor, 6/27/2016
DT Eyes FTTH Solution to German Opex Issue
Iain Morris, News Editor, 6/29/2016
Sigfox Said to Face Customer Backlash
Iain Morris, News Editor, 6/27/2016
Disney Deals $3.5B for MLBAM Stake – Report
Mari Silbey, Senior Editor, Cable/Video, 7/1/2016
Like Us on Facebook
Twitter Feed
BETWEEN THE CEOs - Executive Interviews
In Silicon Valley, Steve Saunders sits down with Cisco's Yvette Kanouff for an exclusive in-depth interview.
At the BCE 2016 show in Austin, ECI Telecom CEO Darryl Edwards tells Light Reading founder and CEO about the Elastic Network concept and the company's NFV and cybersecurity developments.
Animals with Phones
Live Digital Audio

Our world has evolved through innovation from the Industrial Revolution of the 1740s to the information age, and it is now entering the Fourth Industrial Revolution, driven by technology. Technology is driving a paradigm shift in the way digital solutions deliver a connected world, changing the way we live, communicate and provide solutions. It can have a powerful impact on how we tackle some of the world’s most pressing problems. In this radio show, Caroline Dowling, President of Communications Infrastructure & Enterprise Computing at Flex, will join Women in Comms Director Sarah Thomas to discuss the impact technology has on society and how it can be a game-changer across the globe; improving lives and creating a smarter world. Dowling, a Cork, Ireland, native and graduate of Harvard Business School's Advanced Management Program, will also discuss her experience managing an international team focused on innovation in an age of high-speed change.