Light Reading
Where will the segmentation of functions lead cable operators as they start to ponder distributed access architectures?

Embracing Technological Change

Jeff Finkelstein
3/10/2014
50%
50%

    If you want something new, you have to stop doing something old. – Peter F. Drucker

Leaving things behind is hard, especially when it comes to the technologies with which we are comfortable. Many of us have based our careers, either in part or completely, on maintaining legacy systems. When new capabilities are introduced, some spend an inordinate amount of effort trying to derail things, either intentionally or subconsciously. I personally have been there more times than I care to recall.

However, once I began to accept and embrace the change, I could see the potential for it. It is when you hang onto the past and try to slow down the future that you reach the point where, if you are not careful, you may become more a part of the problem than the solution. In the worse case, you can even marginalize yourself.

That is not to say that all change is for the best. But when due diligence shows it is necessary for business or technical reasons, you reach a point where a decision has to be made. You can no longer avoid the change around you and must accept changing yourself.

Eventually, change is inevitable. Except from vending machines…

But back to the discussions from my last blog… Let's start with the graphic showing the top-level functions of a CCAP. (See Learning From Mistakes.)

Now let's take that drawing and break it into network layers for L1 (PHY), L2 (MAC), and L3 (routing)…

I recognize that the delineation between the layers is not that clean, but give me some space to run with this for now. What I am working towards is where the most effective and least disruptive breaks are to show us where we may segment functionality. What I am hoping to show is where this logical segmentation may lead us as we consider distributed access architectures.

Moving layer by layer...
Looking at this from the bottom up, we see that the L1 functions are what we today call a "Remote PHY." This occurs when you pull the physical layer out of the Converged Cable Access Platform (CCAP) core and push it to a remote device, likely in the field collocated with either a fiber node or a cabinet. An interesting point about the L1 functions is that they are typically very hardware-centric due to the modulation and demodulation of signals from a medium. Keep this in mind as we move forward with the discussion.

When we look at L2, this is the constituent MAC functionality that we typically think of as part of the CCAP or CMTS core. Multicast, service flows, quality-of-service, and channel bonding are all functions typically handled by MAC processing. As compared with the L1 functions that are very hardware-centric, many of these functions are software-based and may be possibly run on commercial off-the-shelf (COTS) hardware. Today they are integrated into CCAP, as that is how we built the CMTS from the start.

This monolithic architecture has served us so well for the past 15 years that we are uncomfortable about changing it. If you place them into a separate device, this is what has been termed an "L2 CCAP" or "NR CCAP" (NR stands for non-routing).

Looking at L3, we see more traditional routing functionality. Thinking back to the start of the CMTS era, you may remember that the original CMTS was what we call a Layer 2 device, meaning it did not perform routing. Routing functions were added as we scaled the device and started running into issues with MAC table sizes on the switches and routers connected to the CMTS.

While it has served us well for many years, we are no longer bound by 32,000 or 64,000 MAC address limitations in a switch. These devices are now capable of 1 million or more MAC addresses. There are many good reasons to include routing in the CMTS core, but MAC addresses do not make it a requirement.

Let me get back to the direction of these blogs. Where do SDN and NFV play out in this new CCAP world order? Do they have a place? How can we leverage them to simplify design, enable greater scale in the head-end, and allow us to roll out new services at a greater velocity than we have in the past?

All questions I hope to begin addressing in my next blog. Stay tuned. Same Bat-Time, same Bat-Channel…

— Jeff Finkelstein, Executive Director of Strategic Architecture, Cox Communications

(1)  | 
Comment  | 
Print  | 
Newest First  |  Oldest First  |  Threaded View
Susan Fourtané
50%
50%
Susan Fourtané,
User Rank: Blogger
3/12/2014 | 6:57:39 AM
Embracing technological change
f you want something new, you have to stop doing something old. – Peter F. Drucker
    Nice quote. Or, as Heraclitus put it, "There is nothing permanent, except change." 
    Embracing change, indeed, can be difficult sometimes and not only technological change but business change, or any other change affecting your life, or business in one way or another. 
    However, change may bring new opportunities. In the case of technology change has to be embraced quickly, as quickly as it happens. Otherwise, the company will lack the necessary tools to remain current in its line of business.
      -Susan
More Blogs from Column
Operators can cut the cost and complexity of extending legacy services to all-IP environments.
Norway's Lyse Smart is showing how broadband-enabled applications can improve the lives of elderly people and provide a cost-effective alternative to traditional care home services.
If we can build complex systems from simple components with precise functionality, we can more easily change those systems as new technologies arise.
A list of 10 considerations for municipalities pondering building their own broadband networks.
Communications service providers need to become digital service providers, but what exactly does that entail?
Flash Poll
From The Founder
It's clear to me that the communications industry is divided into two types of people, and only one is living in the real world.
LRTV Custom TV
Using Service Quality to Drive WiFi Monetization

10|22|14   |   6:51   |   (0) comments


Live from the SCTE conference: Heavy Reading's Alan Breznick explores the forces shaping the WiFi opportunity in an interview with CableLabs' Justin Colwell and Amdocs' Ken Roulier.
LRTV Custom TV
Distributed Access Architectures – 2

10|21|14   |   8:51:00 AM   |   (0) comments


ARRIS CTO Network Solutions Tom Cloonan discusses why many if not most MSOs will continue with integrated CCAP, while addressing why some are also looking at two futuristic, distributed access architectures: Remote PHY and Remote CCAP.
LRTV Custom TV
Distributed Access Architectures – 1

10|21|14   |   9:01   |   (0) comments


SCTE Sr. Director of Engineering Dean Stoneback discusses the pros and cons of distributed access architecture (DAA) and its various forms, which range from basic Remote PHY to full CMTS functionality in the node.
LRTV Custom TV
The WiFi Road to Riches – 2

10|21|14   |   3:58   |   (0) comments


ARRIS Senior Solution Architect Eli Baruch talks about how MSOs can enable public and community WiFi through 1) outdoor access points, 2) businesses seeking to offer WiFi to customers, and 3) residential WiFi gateway extensions.
LRTV Custom TV
The WiFi Road to Riches – 1

10|21|14   |   10:15   |   (0) comments


SCTE Director of Advanced Technologies Steve Harris discusses WiFi deployments, drivers, challenges and advances, including 802.11ac, carrier-grade WiFi, community WiFi, Hotspot 2.0, Passpoint, WiFi-First and voice-over-WiFi.
LRTV Custom TV
Advantech Accelerates 100G Traffic Handling

10|17|14   |   7:56   |   (0) comments


Paul Stevens from Advantech explains why handling 100GbE needs a whole new platform design approach and how Advantech is addressing the needs of equipment providers and carriers to give them the flexibility and performance they will need for SDN and NFV deployment.
LRTV Huawei Video Resource Center
Holland's Imtech Traffic & Infra Discusses Huawei's ICT Solution and Services

10|16|14   |   4:49   |   (0) comments


Dimitry Theebe is from the business unit at Imtech Traffic & Infra which delivers communications solutions for transportations. His partnershp with Huawei began about a years ago. In this video, Theebe speaks more about this partnership and what he hopes to accomplish with Huawei.
LRTV Huawei Video Resource Center
Huawei's Comprehensive Storage Solutions Vital for SVR

10|16|14   |   6:16   |   (0) comments


SVR Information Technology provides cloud services for academic and special sectors. With Huawei's support, SVR and Yildiz Technical University has established Turkey's largest and most advanced High Performance Computing system. CSO Ismail Cem Aslan talks about what he hopes Huawei's OceanStor storage system will bring for him.
LRTV Huawei Video Resource Center
Mexico's Servitron's Impression of Huawei at CCW 2014

10|16|14   |   6:35   |   (0) comments


Servitron is a network operator in Mexico that has been in the trunking industry for the past 20 years. Its COO, Ing. Ragnar Trillo O., explains at Critical Communications World 2014 that his company has been interested in the long-term evolution of LTE technology and its adoption for TETRA.
LRTV Huawei Video Resource Center
Building a Better Dubai

10|16|14   |   2:06   |   (0) comments


Abdulla Ahmed Al Falasi is the director of commercial affairs, a telecommunications coordinator for the government of Dubai. Their areas of service span across multiple industries, including police, safety, shopping malls and more. In this video, Abdulla talks about his department's work with Huawei.
LRTV Huawei Video Resource Center
Huawei Lights Up Malaysia Partner Maju Nusa

10|16|14   |   1:59   |   (0) comments


Malaysia's Maju Nusa is an enterprise partner to Huawei in networking, route switches and telco equipment. At this year's Critical Communications World in Singapore, CTO Pushpender Singh talks about what Huawei's eLTE solutions mean to his company and for Malaysia.
LRTV Custom TV
Evolving From HFC to FTTH Networks

10|15|14   |   2:19   |   (0) comments


Cisco's Todd McCrum delves into the future of cable's HFC plant, examining how DOCSIS 3.1 and advanced video compression will extend its life and how the IP video transition will usher in GPON and EPON over FTTH.
Upcoming Live Events
October 29, 2014, New York City
November 6, 2014, Santa Clara
November 11, 2014, Atlanta, GA
December 2, 2014, New York City
December 3, 2014, New York City
December 9-10, 2014, Reykjavik, Iceland
February 10, 2015, Atlanta, GA
June 9-10, 2015, Chicago, IL
Infographics
WhoIsHostingThis.com presents six of the world's most extreme WiFi hotspots, enabling the most epic selfies you can imagine.
Hot Topics
Is Health the Killer App for the IoT?
Jason Meyers, Senior Editor, Gigabit Cities/IoT, 10/22/2014
Drones Hover Over the IoT Sector
Jason Meyers, Senior Editor, Gigabit Cities/IoT, 10/23/2014
Analysts Warn of Major NFV Gaps
Carol Wilson, Editor-at-large, 10/22/2014
Roku Raises $25M, But for What?
Mari Silbey, Independent Technology Editor, 10/23/2014
AT&T: Merger Review Halt Won't Hurt Us
Alan Breznick, Cable/Video Practice Leader, 10/23/2014
Like Us on Facebook
Twitter Feed