& cplSiteName &

Docsis 3.1 Targets 10-Gig Downstream

Jeff Baumgartner
LR Cable News Analysis
Jeff Baumgartner
10/18/2012
50%
50%

ORLANDO -- SCTE Cable-Tec Expo -- The Docsis 3.1 platform will support capacities of at least 10Gbit/s downstream and 1Gbit/s upstream, a move that will certainly prolong the industry's need to deploy fiber all the way to the home.

That was one of the big takeaways here Thursday as engineers with CableLabs and some of the nation's biggest cable operators revealed significant details about Docsis 3.1 for the first time. (See Docsis 3.1 to Be Smarter, Faster & Cheaper and Diving Into Docsis 3.1.)

Docsis 3.1 will try to hit some other broad objectives, including cost reductions on a per-bit basis, the development of an effective migration path to the new platform, and assurance that 3.1 will work on existing hybrid fiber/coax (HFC) plant. Thursday's session didn't outline all the apps and services that might require 3.1, but support for much more IP video is certainly going to be among them.

CableLabs expects to complete the core Docsis 3.1 specifications in 2013 and anticipates seeing initial products as early as 2014, according to Matt Schmitt, director of Docsis specifications at CableLabs.

What's in Docsis 3.1?
To hit its capacity targets, the cable industry wants to increase its spectral efficiency by about 50 percent. As expected, the new specs will do away with 6MHz- and 8MHz-wide channel spacing and instead use smaller (20KHz-to-50KHz-wide) orthogonal frequency division multiplexing (OFDM) subcarriers; these can be bonded inside a block spectrum that could end up being about 200MHz wide. (See Docsis 3.1 Will Change Cable's Data Channels.)

OFDM will be matched up with low density parity-check (LDPC), a Forward Error Correction (FEC) scheme that takes up less bandwidth than the current Reed-Solomon approach. LDPC will let cable pump out more bits per hertz by utilizing higher orders of QAM modulation, including 1024 QAM and 4096 QAM in both the downstream and the upstream, Schmitt said. (256 QAM is typically used in today's cable downstream.)

To point out how much more efficient the new approach will be, Schmitt noted that it would take 780MHz of spectrum to get 5 Gbit/s using Docsis 3.0, but only 500MHz with Docsis 3.1.

The hope is that the move to OFDM will also open up the market to more chipset and system vendors and help to reduce costs. The Docsis 3.0 silicon market, for example, is dominated by Broadcom Corp. (Nasdaq: BRCM) and Intel Corp. (Nasdaq: INTC), with STMicroelectronics NV (NYSE: STM) just recently joining the fray. (See STMicro Takes On Broadcom, Intel in Docsis 3.0.)

Migrating to Docsis 3.1
The aim is to make Docsis 3.1 backwards compatible with Docsis 3.0 and 2.0. So, a 3.1 cable modem termination system (CMTS) will be required to support older modems. The first new modems are expected to be 3.1/3.0 hybrids capable of bonding at least 24 downstream channels and eight upstream channels -- essentially what's supported by the Intel Puma6 chip for Docsis 3.0. (See Intel's New Docsis 3.0 Chip Guns for 1-Gig .)

To avoid pricey forklift upgrades, the hope is that the new generation of Converged Cable Access Platform (CCAP) devices will support 3.1 with software upgrades.

Cable has tossed out the idea of doing a "top-split" that would put fresh upstream spectrum above the downstream spectrum, so it will keep things as they are, with the upstream spectrum operating below the upstream. But 3.1 does anticipate a wider upstream (maybe 200MHz or more) that would expand beyond the 5MHz-to-42MHz range used by most U.S. cable systems today.

The specs also consider the notion of expanding the downstream to about 1.2GHz. Most upgraded plant is built out to 750MHz, 860MHz or even 1GHz.

But that's all optional. The key thing is, "you don't have to change your plant to deploy Docsis 3.1," Schmitt said.

The first Docsis 3.1 products to emerge will be CPEs, predicted Jorge Salinger, VP of access architecture at Comcast Corp. (Nasdaq: CMCSA, CMCSK). That would seed the market with 3.1 devices before the network is upgraded. Salinger also expects 3.1 downstream to be ready before its upstream counterpart.

He added that Comcast has begun to think about a second phase of its spectrum reclamation plan that would put space aside for 3.1 that could also help out with the operator's transition to IP video.

Light Reading Cable will have more coverage of Docsis 3.1 developments throughout the week.



— Jeff Baumgartner, Site Editor, Light Reading Cable

(3)  | 
Comment  | 
Print  | 
Newest First  |  Oldest First  |  Threaded View        ADD A COMMENT
comtech3
50%
50%
comtech3,
User Rank: Light Beer
12/5/2012 | 5:18:50 PM
re: Docsis 3.1 Targets 10-Gig Downstream


DOC-3.1 proposal seems to me an overly ambitious prospect that looks good on paper,but in  reality,isn't possible to achieve with the MSOs current plant given that most cable network of amplifiers are rated at 750MHz,and to lower the channel spacing in KHz rather than MHz would be making a great sacrifice of the guard band that would certainly result in interference despite OFM being used. Also, SNR of amplifiers is a factor to consider where there's a disparity between plant amps and in-home amps.


This disparity presents it's self in that most MSOs amp specs requires 45-47db SNR,whereas in-home amps are lower.This anomaly would surely impact customers experience,especially when thermal fluctuations affect signal output.Ingress both in the plant and the home, would also have to be under tight control


I beg the question.Is there a parsity of bandwidth that requires 10Gbps downstream,and1Gbps upstream? Are we talking shared throughput,or individual usage? If the latter is true,then to me that is obsurd because not even most large corporations require that much! And speaking of corporations.Would the various web portals be able to handle the fast influx with their current servers?


 

paolo.franzoi
50%
50%
paolo.franzoi,
User Rank: Light Beer
12/5/2012 | 5:18:49 PM
re: Docsis 3.1 Targets 10-Gig Downstream


comtech3,


So, you think Google does not use 10 Gbps/1 Gbps at HQ?  I think the much bigger issue at speeds like that in a dedicated pipe is the lack of redundancy unless you were going to buy one of those and then a 10GigE from the telco.


seven


 

Jeff Baumgartner
50%
50%
Jeff Baumgartner,
User Rank: Light Beer
12/5/2012 | 5:18:49 PM
re: Docsis 3.1 Targets 10-Gig Downstream


Well, just the timing alone is ambitious. One vendor told me product intros by 2014 would be exactly that.  Also, I believe this would be shared throughput like Docsis is now. 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   |     |   (0) comments


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
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
TV's Paradox: No HDR Without 4K
Mari Silbey, Senior Editor, Cable/Video, 1/17/2017
Cable Has One Thing Verizon Needs
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.