& cplSiteName &

Setting the Stage for Docsis 3.1

Technically Speaking With SCTE
Technically Speaking With SCTE
Technically Speaking With SCTE
11/16/2012
50%
50%

4:10 PM -- There were any number of things that turned heads at Society of Cable Telecommunications Engineers (SCTE) Cable-Tec Expo last month, but the biggest attention-getter might have been the special session that pulled the covers back on the upcoming Docsis 3.1 spec.

In front of a standing-room only crowd, representatives of CableLabs , major MSOs and SCTE discussed what the new spec would mean for the industry and the steps operators need to take to accelerate deployment. (See Docsis 3.1 Set for a Spring Fling and Docsis 3.1 Targets 10-Gig Downstream.)

Once again, cable engineers are faced with the need to leverage the flexibility and the limits of HFC (hybrid/fiber coax) networks to create higher capacities, faster speeds and -- most important -- more satisfied customers. Docsis 3.1 promises to usher in a whole new era for HFC plant that includes significantly higher performance and greater cost effectiveness.

So what's all the excitement about? There are three key areas in which Docsis 3.1 signaling will be markedly different from its predecessors:

  • Using a higher order of modulation, for greater spectral efficiency, could conceivably add at least 25 percent more capacity and up to 50 percent more over the same HFC network. Note that the proposed DVB-C2 specification in Europe has been tested to support 4096 QAM downstream within existing cable networks.

  • A new modulation format, Orthogonal Frequency-Division Multiplexing (OFDM), that takes efficiency and robustness to new levels. OFDM enables sub-carriers to be squeezed directly against one another, eliminating the need to use valuable RF spectrum as guard bands. At the same time, the longer symbol durations of the sub-carriers make OFDM more capable of dealing with impulse and burst noise than are SC-QAM guard bands.

  • The use of Low Density Parity Check (LDPC) coding to improve noise immunity by several dB over current Reed-Solomon encoding at similar channel efficiency, or to provide greater channel efficiency at the same MER (modulation error ratio).


What does all this mean for cable engineers? Nothing that we haven't proven that we could do in the past. We'll need to tighten our networks further and eliminate ingress and impairments that can impact performance. And to deliver our ultimate objective -- 10Gbit/s downstream by 1Gbit/s upstream -- we'll need greater RF spectrum (1.2GHz to 1.5 GHz downstream, and 200MHz to 400 MHz upstream), but this is far less than would have been required without the other improvements in signaling.

To ensure that engineering teams are aligned with the timing and details of the Docsis 3.1 spec, SCTE has created an HFC Readiness for Higher Order Modulation working group. Under the leadership of Motorola Mobility Technical Fellow Jack Moran, a seasoned Docsis and RF plant engineer, the working group will be creating recommended practices documents that will complement updated SCTE measurement recommended practices and Docsis training. (See SCTE Rallies Around Docsis 3.1.)

Our special session on Docsis 3.1 was a big hit at SCTE Cable-Tec Expo. SCTE and CableLabs are working together to ensure that the real thing lives up to its advance billing.

— Daniel Howard, SVP, Engineering & CTO, Society of Cable Telecommunications Engineers (SCTE)

This is the latest installment of "Technically Speaking with SCTE," a monthly blog of interviews and columns to provide Light Reading Cable readers with timely updates on the SCTE's initiatives and activities.

(2)  | 
Comment  | 
Print  | 
Newest First  |  Oldest First  |  Threaded View        ADD A COMMENT
Duh!
50%
50%
Duh!,
User Rank: Light Sabre
12/5/2012 | 5:17:32 PM
re: Setting the Stage for Docsis 3.1


LDPC = Low Density Parity Check (not Power).  AKA Gallager Codes, after their inventor, Bob Gallager.  That it is now practical to approach the Shannon Limit at these kinds of rates is a testament to Moore's Law.


Jack Moran is a terrific choice for chairman of the HFC Readyness working group.  Jack is an engineer's engineer, with decades of experience driving standards.   I doubt that anybody has more in-depth knowledge of the HFC physical media and transmission impairments.  He's definitely one of the good guys.


 

Jeff Baumgartner
50%
50%
Jeff Baumgartner,
User Rank: Light Beer
12/5/2012 | 5:17:31 PM
re: Setting the Stage for Docsis 3.1


Yep, "parity," not "power"... thanks, should've caught that typo. JB

From The Founder
Cisco's Conrad Clemson, recently promoted to head up the company's Service Provider Apps & Platforms developments, talks to Light Reading's Founder and CEO Steve Saunders about how he's bringing cloud video, mobile and virtualization together to empower network operators.
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
Heavy Reading: The Web-Scale View

1|18|17   |     |   (0) comments


At Light Reading's 2020 Vision Executive Summit in Rome, Heavy Reading's former chief analyst Patrick Donegan shared insight from the recent web-scale operators report, which featured research on how web-scale operators view the market, the best web-scale companies to ...
LRTV Custom TV
Cisco's Cloud Scale Networking: Automation, Virtualization & Simplification

1|18|17   |     |   (1) comment


Cisco's Sanjeev Mervana outlines the latest innovations in networking technology at CES 2017 in Las Vegas.
LRTV Custom TV
ADVA Talks Innovation & the Future of Networking

1|17|17   |     |   (0) comments


Ray Le Maistre and Christoph Glingener, CTO of ADVA Optical Networking, discuss the current state of the industry, cooperation and collaboration, open innovation and the future of networking.
LRTV Custom TV
Cisco's Infinite Video Platform

1|17|17   |     |   (0) comments


Cisco's Infinite Video Platform allows service providers to deliver broadcast-quality video over IP networks. Infinite video supports many devices, from 4K TVs to tablets to game consoles. Join Cisco's Rajeev Raman for a brief tour and live demo.
LRTV Interviews
Masergy: Ability to Adapt Key for NFV

1|16|17   |   6:40   |   (0) comments


Speaking at Light Reading's 2020 Vision in Rome, Masergy's VP, Global Technology, Ray Watson, said agility is key to providing the mix and match NFV-based services that are driving business for the managed service provider today.
LRTV Interviews
Equinix: The Data Explosion

1|13|17   |   4:16   |   (0) comments


At Light Reading's 2020 Vision in Rome, Eric Schwartz, president of EMEA, Equinix, talked about how Equinix is helping its customers manage the influx of data today, and how it's preparing for a future filled with millions of connected IoT devices.
LRTV Interviews
Heavy Reading: The Changing Data Center Landscape

1|12|17   |   6:05   |   (1) comment


At Light Reading's 2020 Vision event in Rome, Heavy Reading's Senior Analyst Roz Roseboro talks about how virtualization is impacting data center evolution and how that evolution is affecting the relationship between service providers, data center operators and public cloud providers.
LRTV Interviews
Boingo: Prepping for Millions of Devices

1|12|17   |   5:07   |   (1) comment


At Light Reading's 2020 Vision in Rome, Boingo's CTO Derek Peterson discusses how wireless operators will address the needs of low-bandwidth and high-bandwidth apps at the same time, the need for more MHz, the impact of IoT and more.
LRTV Interviews
Comcast Shows Off Gig Gateway at CES

1|11|17   |     |   (1) comment


With its largest presence at CES in years, Comcast took the wraps off its long-awaited gigabit gateway and a new platform for managing the home WiFi network. Light Reading Senior Editor Mari Silbey sat down with EVP Chris Satchell to discuss the latest Comcast advance, and met with VP of Product Strategy and Development Andrea Peiro to walk through a demo of the ...
LRTV Interviews
Colt: End-to-End Key for 2017

1|10|17   |   6:21   |   (0) comments


At Light Reading's 2020 Vision Executive Summit in Rome, Nico Fischbach of Colt said having a multi-carrier, end-to-end service proposition is going to be key for 2017 -- and SD-WAN is instrumental in making it happen.
From the Founder
Cisco's Clemson on Mobile Cloud Video

1|9|17   |     |   (1) comment


Cisco's Conrad Clemson, recently promoted to head up the company's Service Provider Apps & Platforms developments, talks to Light Reading's Founder and CEO Steve Saunders about how he's bringing cloud video, mobile and virtualization together to empower network operators. "If you think about where we're going… whether it's a mobile application, or a video ...
LRTV Custom TV
VMware Telco NFV Solutions – Preparing for 5G & IOT

1|9|17   |     |   (0) comments


Shekar Ayyar, EVP & Corporate Strategy/General Manager of Telco for VMware, discusses VMware's Telco NFV solutions role and foundation for the Imminent Arrival of 5G & IOT.
Upcoming Live Events
March 21-22, 2017, The Curtis Hotel, Denver, CO
May 15-17, 2017, Austin Convention Center, Austin, TX
All Upcoming Live Events
Infographics
With the mobile ecosystem becoming increasingly vulnerable to security threats, AdaptiveMobile has laid out some of the key considerations for the wireless community.
Hot Topics
A Women in Comms Glossary
Sarah Thomas, Director, Women in Comms, 1/18/2017
Is Cable One Beefing Up for Slaughter?
Alan Breznick, Cable/Video Practice Leader, Light Reading, 1/20/2017
Nokia CTO: 2017 Is the Year 5G Gets in the Field
Dan Jones, Mobile Editor, 1/19/2017
Google Security Lessons for IT
Curtis Franklin, Security Editor, 1/18/2017
TV's Paradox: No HDR Without 4K
Mari Silbey, Senior Editor, Cable/Video, 1/17/2017
Like Us on Facebook
Twitter Feed
BETWEEN THE CEOs - Executive Interviews
Light Reading founder and CEO Steve Saunders chats with Sportlogiq CEO Craig Buntin about sports data analysis.
Eyal Waldman, CEO of Mellanox Technologies, speaks to Steve Saunders, CEO of Light Reading, for an exclusive interview about the 100 GB cable challenge, cybersecurity and much more.
Animals with Phones
Live Digital Audio

Playing it safe can only get you so far. Sometimes the biggest bets have the biggest payouts, and that is true in your career as well. For this radio show, Caroline Chan, general manager of the 5G Infrastructure Division of the Network Platform Group at Intel, will share her own personal story of how she successfully took big bets to build a successful career, as well as offer advice on how you can do the same. We’ll cover everything from how to overcome fear and manage risk, how to be prepared for where technology is going in the future and how to structure your career in a way to ensure you keep progressing. Chan, a seasoned telecom veteran and effective risk taker herself, will also leave plenty of time to answer all your questions live on the air.