Q: Is a Docsis 3.1 modem worth it? Once upon a time, when DOCSIS was created, it had one mission: To move IP data over cable’s hybrid-fiber coax (HFC) networks. and they offer gigabit speeds @ 1/10gigabits? How is fiber different from DOCSIS 3.1? OFDM makes quantum leaps in the amount of data capacity and speed available – sometimes as much as 50 percent more capacity over the same spectrum. But switching over to DOCSIS 3.1 is a lot more affordable on the ISP’s end compared to building a new network of fiber-optic lines—it’s like installing new tires for a car versus building an entirely new car from scratch. Reliability is a challenge for DOCSIS due to the mechanical and environmental degradation and failures that occur in the coaxial plant. Required fields are marked *, You may use these HTML tags and attributes:
. Mr. Volpe has been providing a wide range of troubleshooting, design solutions, services and seminars for cable operators and broadband companies specializing in DOCSIS, System Design, PNM, and Troubleshooting. Your email address will not be published. Are you planning to deploy DOCSIS 3.1 into your network? It is a DOCSIS 3.0 modem with an inbuilt AC1600 dual-band Wi-Fi … Anyone who has ever worked in a cable plant knows that coax does not get better over time. Data Over Cable Service Interface Specification (DOCSIS) is an international telecommunications standard for the addition of high-bandwidth data transfer to an existing coaxial cable TV system. It is something that you can rent from your ISP but you can also buy your own. Without a return path, the old DOCSIS 1.0 standard still allows use of data over cable system, by implementing the … So I got some industry intel to help me better understand the differences. It’s not self-healing. Do NOT follow this link or you will be banned from the site. VIAVI Perspectives offers a view of timely industry trends, innovations and breaking news from Viavi bloggers and leaders. The cost to install new fiber is on parity with coax. It offers faster downloads speeds on the coaxial cable as compared to fiber cable. If you look at fiber objectively from any other perspective it outperforms DOCSIS. OFDM and profiles are much more complex than we can describe in a single blog post. The question we face is will DOCSIS 4.0 and future versions of DOCSIS enable us to keep up with the telecom industry’s focus on fiber deep deployment? To make the latest gigabit fiber internet to work, you need a DOCSIS 3.1 gigabit cable modem. On fiber … Save my name, email, and website in this browser for the next time I comment. o DOCSIS 1.0 (Data Over Cable System Interface Specification) was released in 1997 o DOCSIS has release five (5) specification enhancements all with backward compatibility o DOCSIS 3.1 offers multiple Gbps data rates capacity / speed varies based on spectrum allocation FTTH (Fiber to the Home) DOCSIS question to a dozen or so smart, tech-side people. This is the key differentiator for DOCSIS technology vs. fiber, where most of the backhaul connections require either new build or premium lease rates. There are a few different types of modems. — Fiber is the winner from a pure physics standpoint as it is inherently easier to provide higher bandwidths in fiber. Fiber is able to transport more data at higher speeds than cable, but completely replacing a cable network with fiber is cost prohibitive. Fiber, and specifically GPON, has fewer moving parts than DOCSIS or RFoG. In this TCO analysis, we showed >50% reduction in TCO for an outdoor use case of backhauling small cells when served by DOCSIS networks compared to a more traditional deployment served by fiber. – How Leakage Technologies Can Protect Your Network Heroes, The future and ecosystem of an all-optical network, “The Many Paths to 400G” from Gazettabyte, SUNBURST and the importance of evidence-based risk management, VPN testing: it’s never been more important and it’s never too late, How Fiber Optics Supports Cloud Technology, Keeping the marketing wheel moving in APAC. He has over 25 years of broadband cable and telecommunications industry experience specializing in RF, DOCSIS, PNM, and Internet Protocol. If we take those out (since DOCSIS network upgrades will happen anyway for residential broadband services) the TCO of these indoor use cases get even better compared to the fiber outdoor case (scenario 1). FTTH is a Point to MultiPoint (P2MP) network architecture, DOCSIS 3.1 is a transport mechanism. The TCO model introduced here confirms and quantifies that perceived benefit and points out that for network densification, there is a business case to pursue the indoor femtocell use case where market conditions are favorable. DOCSIS 3.1, released in 2013, closes the gap. It can support data transfer up to 10 gigabits per second downstream and 1 gigabit per second upstream over cable, which was only possible over the fiber-optic network. For more in depth information, see the white paper “DOCSIS 3.1: Best Practices for Peak Performance”. Broadband Library is an exclusive member-benefit of the Society of Cable Telecommunications Engineers (SCTE) and its global brand, the International Society of Broadband Experts™ (ISBE). Data-Over-Cable Service Interface Specifications (DOCSIS) was already in development which enabled the cable industry to provide high speed data and later voice-over-Internet protocol (VoIP). Fiber is NTP. 6001 America Center Drive, 6th Floor, San Jose, CA 95002. So, first of all, let’s clarify that this should not be a question of FTTH – Fiber To The Home vs. DOCSIS 3.1 Cable Technology. DOCSIS 3.1 vs Fiber Prior to DOCSIS 3.1, Fiber to the Home (FTTH) was the only available option for consumers seeking the highest order of data transmission speeds. My point is that it’s important that we understand what we are up against and not put blinders on. DOCSIS has become one of the key elements helping cable operators dominate broadband services. He is a highly respected published speaker, both domestically and internationally. It is important to understand the differences so that you are informed before renting or buying your own modem. FTTH is a Point to MultiPoint (P2MP) network architecture, DOCSIS 3.1 is a transport mechanism. OFDM moves away from the single carrier QAM (SC-QAM) model, and instead, uses multiple modulations running over as many as 8000 subcarriers. But in the case of fiber, you don’t need Docsis 3.1 as fiber internet only works with fiber optic specific modems. It is a standard for transferring data over the cable system. Cable throughput speeds have traditionally been lower than fiber options, although DOCSIS 3.0 enables 1 Gbps download speeds (but this is not a symmetrical connection as … One of the other essential facts about DOCSIS 3.1 is that it is backward compatible. Furthermore, fiber-optic cables are much less susceptible to interference and noise than coax or wireless channels. Providers will need to make some upgrades to their networks to reach the highest levels of performance, but because of the inherent capabilities of OFDM, DOCSIS 3.1 provides immediate performance enhancements. DOCSIS 3.1 Modem vs 3.0 Speeds and Testing Data Over Cable Service Interface Specification (DOCSIS) is an international telecommunications standard for the addition of high-bandwidth data transfer to an existing coaxial cable TV system. This is the dream of every home. DOCSIS is delivered on coaxial cable. Evolve or Die: Can DOCSIS 4.0 Compete with Fiber? DOCSIS 3.1. This falls under the terminology of extended spectrum DOCSIS (ESD) in the DOCSIS 4.0 specification. In case you decide to switch from Xfinity in the future, you should note that this modem is also not compatible with AT&T, Century, or other DSL and Fiber internet service providers. If one part of the plant is clean, a higher profile (and modulation) would be used such as 4096 QAM. Learn > Cable Modem & Routers > DOCSIS 3.1 Modem vs 3.0 Speeds and Testing. Even if we don’t know what we will do with a 1 Gbps Internet connection most will surely take it if it is offered. Thread starter warm; Start date Feb 21, 2016; Tags docsis 3.1 Feb 21, 2016 #1 W. warm n00b. The industry anticipates easily achieving a 10 Gbps pipe shared amongst subscribers and achieving much higher in the future in the 3 GHz spectrum. market. Fiber is NTP. The benefit with coax is that it is already there, passing more than 90% of the homes in the U.S. Cost of deployment is where coax has a huge advantage over fiber. DOCSIS lies between these 2, as it is faster than DSL but slower than Fiber technology. MoCA vs. DOCSIS 3.1: Whose Spectrum Is It? One of the main changes to DOCSIS 3.1 is orthogonal frequency domain multiplexing (OFDM). SCTE•ISBE IS FOCUSED ON THE WORKFORCE OF THE FUTURE, CHECK OUT THE LEADERS IN BROADBAND TECHNOLOGY, https://www.cablelabs.com/technologies/docsis-4-0-technology, https://www.cablelabs.com/technologies/docsis-3-1, To Boldly Go Where Cable Has Not Gone Before – Virtual CMTS/CCAP, How Telecoms are Leveraging 5G to Attract Gamers, DOCSIS 4.0 | Providing 10 Gbps pipe at the right cost, Marketing: It’s a tie provided DOCSIS 3.1 or 4.0 are deployed. GPON vs. DOCSIS 3.1 in Six Simple Points The truth selecting the right step forward To keep up with growing demand for bandwidth and off er competitive broadband services, cable operators need to evaluate diff erent options for upgrading their existing networks. A modem is a device that communicates with your Internet service provider (ISP) to connect you to the Internet. DOCSIS 3.1 Modem vs 3.0 Speeds and Testing. It would bankrupt most if not all cable operators. Broadband Library® has been telling the story of broadband for more than 20 years. With the introduction of DOCSIS 3.1, this all changes. I have some NTP associations from my house to a server in a datacenter. Today we are looking to extend the RF range of coax cable up to 1.8 GHz (investigation for up to 3 GHz is underway for even more capacity!). Where DOCSIS 3.0 was able to achieve 6.3 max bits/Hz, DOCSIS 3.1 is able to achieve 10.5 max bit/Hz at 4096 QAM. I have some NTP associations from my house to a server in a datacenter. These delights, however, are being served alongside a host of challenges and complex puzzles that need to be solved in order to ensure a positive customer experience. The Main Differences. For EuroDOCSIS it’s 6.952 Msym/s for both 64-QAM and 256-QAM. The best DOCSIS 3.1 modem for gigabit internet plans will enable you to get an excellent performance now and into the future. Further, if there are fewer problems with a fiber network the end user or subscriber is less likely to experience problems due to plant impairments. To us, it was always a no-brainer that a DOCSIS network-based deployment would have favorable economics compared to a fiber-based model. Joined Apr 20, 2013 Messages 16. i'm still not sure if i understand the concept of docsis 3.1, technically docsis 3.1 is just replacing the box/modems on both sides with the same cooper cable/lines connected right? Coax was installed and designed to deliver TV. OFDM is able to use the highest QAM possible that any specific part of the plant can handle at any given point in time for each of the subcarriers. DOCSIS 4.0 was designed to hit downstream speeds of up to 10 Gbps, which is twice the download speed of DOCSIS 3.1, and an upstream of up to 6 Gbps (quadruple the DOCSIS … DOCSIS 3.1, DOCSIS 4.0, point-to-point coherent optics, PON, and advanced wireless technologies will all enable 10G speeds. It allowed cable and telecom to directly compete with each other. Fiber may be faster, but it is available only in limited areas, and DSL may be having range, but it is often quite slow. Absolutely not. Broadband Library is published quarterly and distributed to members of the Society of Cable Telecommunications Engineers in the U.S. CPM # 40065056 Printed in U.S.A. This often translates directly into more satisfied customers. Marketing: It’s a tie provided DOCSIS 3.1 or 4.0 are deployed In my opinion we as an industry are betting on DOCSIS 4.0 for only one reason — cost. DOCSIS 3.1—which includes LDPC encoding, very high modulation orders (e.g., 4096 QAM), more than 1 GHz of usable spectrum and support of QoS and low latencies—is the latest digital communications technology, but it's not a replacement for your existing hybrid fiber coax (HFC) architecture that uses coaxial cable to connect to homes. Cable Modem vs DSL Modem or Fiber. It is very tough to win a marketing war against raw speed. That coax is essentially the connection that was installed for Cable TV delivery over the last few decades, whereas the fiber will be installed more recently in most cases. Fiber, and specifically GPON, has fewer moving parts than DOCSIS or RFoG. E-Books are archived by quarter and permanently stored on our site. GPON vs. DOCSIS 3.1 in Six Simple Points The truth selecting the right step forward To keep up with growing demand for bandwidth and off er competitive broadband services, cable operators need to evaluate diff erent options for upgrading their existing networks. G.PON and N.GPON 2 offer OSS supporting DOCSIS provisioning (Open Link Cable) and vendors like Calix offer sealed OLTs, powered via Coax for distributed outdoor deployments allowing replacements of micro … Until now, providers have added fiber to new parts of the plant and tried to make the most of DOCSIS over existing cable networks. The symbol rate for US DOCSIS is 5.056941 megasymbols per second (Msym/s) for 64-QAM and 5.360537 Msym/s for 256-QAM. Docsis means Data Over Cable Service Interface Specification. Other technologies such as proactive network maintenance (PNM) and Low Latency DOCSIS will continue to improve reliability and latency.” It pays to think of FTTH and HFC as different tools in the same box. Without getting too far into the mud of data networking, here’s what they had to say. Faster speeds, better service, less cost and 10G sound great. On fiber … This is the dream of every home. This question may be in your head when building innovative networks and providing the best service to your customers. These delights, however, are being served alongside a host of challenges and complex puzzles that need to be solved in order to ensure a positive customer experience. A lot fewer things out in the field to need to mess around with, like amps … The middle is DOCSIS. Let us know in the comments below. Check out past issues of the award-winning Broadband Library! As a result of this, the raw downstream bitrate of one 256-QAM downstream channel is about 42.88 Mbps for DOCSIS vs. 55.62 Mbps for EuroDOCSIS. From the technical side, let’s look at the raw capability of fiber and today’s DOCSIS 4.0 technologies. Physics: Fiber wins 2. Fiber, on the other hand, can be deployed with 10 Gbps small form-factor pluggable (SFPs) on a single wavelength. [1] DOCSIS 4.0 supports a downstream throughput with 4096-QAM and 25 kHz subcarrier spacing of up to 1.89 Gbps per 192 MHz OFDM channel. However, it does not support cable digital voice service. DOCSIS 3.1 has ten times more speed than DOCSIS 3.0. In case you decide to switch from Xfinity in the future, you should note that this modem is also not compatible with AT&T, Century, or other DSL and Fiber internet service providers. Without a return path, the old DOCSIS 1.0 standard still allows use of data over cable system, by implementing the … The question for cable operators that already have HFC networks is how to know when they should invest in the current HFC network vs. deploying fiber all the way to the home. Should we therefore abandon DOCSIS? Comparisons of FTTH and DOCSIS (.pdf) usually aren't very thorough. If so, what are the main questions you have concerning OFDM and profiles? The Telecommunications Act of 1996 forever changed the cable industry. 35 A typical fiber-optic cable has around 10,000 times more usable bandwidth than a typical coaxial cable. The creation of DOCSIS 3.1 has made this choice more difficult because DOCSIS 3.1 enables 10 Gbps services to the home over HFC networks. The latest version, DOCSIS 3.1, allows up to 10Gbps downstream and 1Gbps upstream, which to-date had only been possible with a fiber optic connection, and can, with few infrastructural changes, be easily deployed over existing infrastructure. Pingback: DOCSIS 4.0 | Providing 10 Gbps pipe at the right cost. Your email address will not be published. And what major changes need to be made to take advantage of OFDM? The combination is an efficient and cheap way to bring locations together in an SD-WAN. Cable providers have spent years trying to solve a dilemma: “Do we spend money to completely upgrade the plant or do we make due with incremental improvements to our existing plant?”. Let’s look at the scorecard: 1. MoCA vs. DOCSIS 3.1: Whose Spectrum Is It? Before a cable company can deploy DOCSIS 1.1 or above, it must upgrade its hybrid fiber-coaxial (HFC) network to support a return path for upstream traffic. Data Over Cable Service Interface Specification (DOCSIS) is a long way to say “how cable Internet works.” DOCSIS 1.0 was developed by Cable Labs in 1997, and it’s been under development since, getting faster and more power-efficient with each incarnation.. The original question was can DOCSIS 3.1 or even future versions of DOCSIS compete with fiber? He also hosts a popular industry YouTube and Podcast – “Get Your Tech On“. As fiber networks continued to propagate between source and user, the install base of fiber and ultimately the elimination of coaxial cable in favor of fiber seemed like a forgone conclusion. Comparisons of FTTH and DOCSIS (.pdf) usually aren't very thorough. Fiber is able to transport more data at higher speeds than cable, but completely replacing a cable network with fiber is cost prohibitive. Other technologies such as proactive network maintenance (PNM) and Low Latency DOCSIS will continue to improve reliability and latency.” It pays to think of FTTH and HFC as different tools in the same box. A lot fewer things out in the field to need to mess around with, like amps … However, it does not support cable digital voice service. Cost: DOCSIS wins 3. One application where I absolutely see the difference in DOCSIS vs. Be it aerial or buried, there is a lot involved with permits, trenching, not to mention the headaches of tearing up people’s lawns. DOCSIS 4.0 unifies previously feuding Full Duplex DOCSIS and Extended Spectrum DOCSIS proposals for boosting network bandwidth. If you look at fiber objectively from any other perspective it outperforms DOCSIS. So, DOCSIS provides the best of both worlds to the user. DOCSIS 3.1 is expected bring many things to the cable operator's table, including increased capacity and more robust modulation. For new builds or upgrades to older Docsis installations, fiber, especially PON which mirrors HFC deployments (topology wise) is a more future proof and less OPEX intensive solution. This is the key differentiator for DOCSIS technology vs. fiber, where most of the backhaul connections require either new build or premium lease rates. One of the best aspects of OFDM is that providers can immediately take advantage of speed and throughput increases without making major upgrades to existing networks. Its main advantage lies in its range and data transmission rate. We allocated 20% of DOCSIS network upgrade (from low split to mid split) cost to DOCSIS network-based use cases (scenarios 2 and 3). In general, there have been three different major iterations of DOCSIS over the years; 1.x, 2.x, and 3.x. This would give us: That exceeds our 10G initiatives. Any estimates of cost per sub to upgrade to Docsis 3.1? Again, most homes already have the coax drop in place. DOCSIS 3.1, DOCSIS 4.0, point-to-point coherent optics, PON, and advanced wireless technologies will all enable 10G speeds. — However, with just plain facts fiber wins in reliability. With the DOCSIS 3.1 deployments starting to roll out, the cable industry is, of course, thinking about what comes next. DOCSIS x.x is MOCA or Coax. Marketing is the great intangible, which I have written about in previous Broadband Library articles. In this TCO analysis, we showed >50% reduction in TCO for an outdoor use case of backhauling small cells when served by DOCSIS networks compared to a more traditional deployment served by fiber. Reliability: Fiber wins 4. 6500 Reconfigurable Line System. For a quick overview of how DOCSIS 3.1 works, this infographic is a great place to start. Absolutely not. At the recent CableLabs Winter Conference, CableLabs unveiled Full Duplex DOCSIS technology, which offers the promise of symmetrical 10 Gbps on 1 GHz HFC networks. It is a DOCSIS 3.0 modem with an inbuilt AC1600 dual-band Wi-Fi router. This can give providers some time to make those upgrades, while increasing quality of experience for their customers in the near term. The fiber nodes are connected to a distribution hub using a single fiber for the upstream and a single fiber for the downstream. DOCSIS 3.1 is the current modem technology. So I got some industry intel to help me better understand the differences. That is 10 times more capacity than DOCSIS 4.0 and it exists today. Studies have shown that fiber costs five times less per mile than coax to maintain. DOCSIS 4.0 enables this competition by providing a 10 Gbps pipe. DOCSIS 3.1 is the current modem technology. One application where I absolutely see the difference in DOCSIS vs. The hybrid fiber/coax (HFC) network architecture, used by broadband cable in conjunction with Data Over Cable Service Interface Specification (DOCSIS), has many years of useful service left. In the past, DOCSIS speeds have been slow compared to pure Ethernet speeds. It offers faster downloads speeds on the coaxial cable as compared to fiber cable. Before a cable company can deploy DOCSIS 1.1 or above, it must upgrade its hybrid fiber-coaxial (HFC) network to support a return path for upstream traffic. If your ISP offers internet packages of over 1Gbps, then a Docsis router a worthy investment for you. DOCSIS 3.1 vs Fiber Prior to DOCSIS 3.1, Fiber to the Home (FTTH) was the only available option for consumers seeking the highest order of data transmission speeds. docsis 3.1 vs fiber? For new builds or upgrades to older Docsis installations, fiber, especially PON which mirrors HFC deployments (topology wise) is a more future proof and less OPEX intensive solution. If your ISP offers internet packages of over 1Gbps, then a Docsis router a worthy investment for you. DOCSIS 3.1 is expected bring many things to the cable operator's table, including increased capacity and more robust modulation. Brady Volpe is Founder of The Volpe Firm, Inc and Nimble This LLC. The question for cable operators that already have HFC networks is how to know when they should invest in the current HFC network vs. deploying fiber all the way to the home. © Copyright 2018 Lundwall Communications, Inc. All Rights Reserved. But in the case of fiber, you don’t need Docsis 3.1 as fiber internet only works with fiber optic specific modems. If there is some noise in another part of the plant, a lower profile (and modulation) would be used in that part of the plant such as 1024 QAM. First, let’s clarify that it is NOT FTTH vs. DOCSIS 3.1. The limited speeds are because not everyone has adapted to DOCSIS 3.1. (adsl+2) and they offer gigabit speeds @ 1/10gigabits? DOCSIS has made incremental improvements over time, but has never been able to compete head-to-head with fiber. Over the years, as bandwidth demand grew, DOCSIS answered the call by enabling fiber-like Gigabit per second capacity. o DOCSIS 1.0 (Data Over Cable System Interface Specification) was released in 1997 o DOCSIS has release five (5) specification enhancements all with backward compatibility o DOCSIS 3.1 offers multiple Gbps data rates capacity / speed varies based on spectrum allocation FTTH (Fiber to the Home) The best DOCSIS 3.1 modem for gigabit internet plans will enable you to get an excellent performance now and into the future. Each profile adjusts the modulations of the subcarriers for different signal to noise conditions. CableLabs said the raw speeds enabled by DOCSIS 4.0 on widely deployed hybrid fiber/coax (HFC) networks represent a doubling of the max downstream available via DOCSIS … In a more typical situation where multiple QAMs are being used at the same time, DOCSIS 3.1 is still able to achieve 8.5 bits/Hz – making it 35% more efficient without changing the HFC plant. But how is this possible? It has been over a 20-year competition between telecom and cable operators, one that the cable industry has done quite well with and the telecom industry has struggled to keep up. The main take away is that DOCSIS no longer needs to be optimized for the worst part of the plant. [1] https://www.cablelabs.com/technologies/docsis-4-0-technology, [2] https://www.cablelabs.com/technologies/docsis-3-1. Running at peak performance, DOCSIS 3.1 has the ability to provide 10 G on the downstream and 2 G on the upstream – speeds that can rival fiber. And Docsis 3.1 is a new generation of technology made for high-speed connections. Both cable operators and telecom operators can deploy fiber and are doing so today. The creation of DOCSIS 3.1 has made this choice more difficult because DOCSIS 3.1 enables 10 … Nor had Gigabit Ethernet, or “Gig-E,” gained such dominance in metropolitan and wide area networks as a remarkably cheap, fast way to move data over fiber. Until now, providers have added fiber to new parts of the plant and tried to make the most of DOCSIS over existing cable networks. So, if you are in the market to buy a new modem, then why not buy a modem that is future proof. Should we therefore abandon DOCSIS? Data Over Cable Service Interface Specification (DOCSIS) is a long way to say “how cable Internet works.” DOCSIS 1.0 was developed by Cable Labs in 1997, and it’s been under development since, getting faster and more power-efficient with each incarnation.. [2] The biggest expense with fiber is running the subscriber drop. Expect to see commentary, videos and visuals on topics about the network, mobility, the Enterprise and more. First, let’s clarify that it is NOT FTTH vs. DOCSIS 3.1. Once upgrades are made, DOCSIS 3.1 will give providers speeds that can compete with fiber. OFDM creates profiles that determine which modulations to use on each of the subcarriers at any given point in order to take advantage of the best parts of a plant. Stay SAFE! Q: Is a Docsis 3.1 modem worth it? If your ISP doesn’t support Docsis 3.0, you’ll also find the Docsis 3.1 modem as the only cable modem option available for you.

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