DOCSIS® 3.1 - An Overview
ฝัง
- เผยแพร่เมื่อ 6 พ.ย. 2016
- Ron Hranac, Technical Leader
Cisco Systems
DOCSIS 3.1 is the latest Data-Over-Cable Service Interface Specifications. CableLabs® released version I01 of the new specification in late October 2013. DOCSIS 3.1 introduces a new physical layer, improved Forward Error Correction (FEC) and other features for high-speed data transmission on cable networks. Scalable to 10+ Gbps in the downstream and 1+ Gbps in the upstream, DOCSIS 3.1 supports services competitive with fibre to the home, but using cable’s HFC platform. Cisco’s Ron Hranac will provide an overview of DOCSIS 3.1 from a physical layer perspective.
The presentation will include information on the following:
- Why DOCSIS 3.1?
- Basic principles of Orthogonal Frequency Division Multiplexing (OFDM).
- Spectrum allocation.
- FEC performance enhancements.
- New Proactive Network Maintenance (PNM) measurements.
As a Comcast Xfinity technician I think this video should be shown in training to all techs and to all business partners.. not enough techs know anything about the job they do. They just know what they need to, enough to leave jobs working and docsis in spec. I love technology and I make sure to learn as much as possible. Knowledge is power.
This is the best DOCSIS 3.1 video I have come across. Many thanks to Ron and everyone at SCTE for making this public.
Watching this on a 1Gbit/s DOCSIS 3.1 Connection in Germany. Time flies!
Me too. In Poland
Docsis 3.1 for Dummies..
Amazing presentation and what a knowledgeable person Ron.
Great one to watch and learn more of the abbreviations what it means..
Awesome to see this on youtube thanks for making it available
What an excellent overview. Was just after an overview of a tech I've been using for 20 years now and had no real idea how it worked. Just had Virgin Media upgrade me to 1Gbps, shocked that it's really 1.1Gbps on old Coax cable. Can't see things going past 1Gbps, we're at the local network limit! And WiFi's getting faster, but only in the same room.
Time to upgrade to 2.5 or 5 or 10Gb/s Ethernet.
Great presentation. Many thanks!
Super instructive. Thanks for sharing this formation!
Excellent presentation. New cable professional and it really helped me build upon my existing knowledge and explains OFDM/OFDMA for DOCSIS 3.1 really well.
A great overview of the history from DOCSIS 1.0 to DOCSIS 3.1. It would be nice to have a sequel on DOCSIS 4.0.
Hold on there boy. Let the Internet Provider catch up for a moment.
The fastest speed by far, 2Gig
3.1 max speed is 10Gig
but internet provider by far can only give their fastest internet service offer is 2Gig
awesome presentation. exclusion band is great feature to maintain backward compatibility and LDPC is great improvement. Thank you.
Fan of Ron Hranac here un Colombia.
Thanks Ron....
Thank you very much for this outstanding presentation and share.
Thanks sir,... very informative....you know your stuff
Excellent presentation. Very informative.
Excellent..!!!
Great presentation and easy to understand. Thanks.
Ron is the man!!
I have a docsis 3.1 modem (Fritzbox 6591) but it says "Connection type eurodocsis 3.0". Why it isn't 3.1?
Excellent and informative DOCSIS 3.1 Video many thanks Ron! Any chance that I can get the slide ? Regards, Ilan
Time 24:58 how come that right-side signal became an analog?
Alguna página referida a esto en castellano?
Hi any chance i can get the presentation on file sent to my email :)
Hold on there boy. Let the Internet Provider catch up for a moment.
The fastest speed by far, 2Gig
I love this presentation, but that last slide has me laughing... "FTTH equiv" Not even remotely. Not even in 2016. Fiber was already doing 1G symmetric. It's doing 10G symmetric now. (T is selling 2000 and 5000 plans in several markets today - end of 2021) Spending any time/money on cable physical infrastructure (mid-split, high-split, FDX) is burning money better spent on fiber; cable _cannot_ compete with fiber. Even going full D4.0 with a complete forklift "upgrade" to a full spectrum bidirectional system will only get cable to the point fiber was years ago. The only thing cable has going for it today is that it's already in the ground.
not very good. The distance over it works is pathetic compared to fiber. That is why it is not mentioned, you would laugh. It is worse. HFC has multiple points of failure. Fiber is basically a star network. This is basically a bus network. The maintenance costs of fiber beat copper easily. If it is so good, why isn't it under the sea? The only thing is that copper is a legacy thing and that is the only advantage but very slim advantage. DOCSIS and the copper cable industry are keeping things from going forward.
Johnny bizaro coax isn’t ran under the sea because fiber allows for longer runs without a repeaters. HFC networks are not a bus network the Fiber in HFC networks use a transport ring topology (redundant as hell). The coax ran from the fiber nodes is pretty much the same way FTTH gets distributed to the home. Also you should apologize to the engineers who dedicate their lives to this science and continuous advancements in this industry.
I believe the use for this is for cable companies to use the existing copper in the field to give the subscribers more. Idk why your focus is on topography, this is just a way of keeping the equipment in the field and changing the equipment @ the cmts and the node. If this were a structured topic of how to get FTTH, i think you would have a valid point.
You should read your own comments. Did you get what you just typed? You just justified that I was correct. Fiber is superior to coaxial in every way including it is cheaper to maintain. The fact is using coaxial is never justified at all especially when laying new cable for pay tv. Coaxial it is out dated and if it is to be used , short runs for satellite or antenna feeds. Coax was run under the sea before fiber. Ring topology might be the case in some circumstances but the reality is most of it is not ring. Ring topology redundancy is not the reality, tell the people who pay for pay tv. You are making up stupid comments. You are lucky that I even point out how stupid your comment is. That last comment about I should apologize to engineers who dedicated their lives to this science is boarding on complete idiocy. You stupid comment tells me you should stop drinking water out of Flint Michigan or some of the other states that have lead contaminated water.
These are HFC networks meaning they use fiber.
Johnny, Most if not all HFC networks are based on ring (SONET / SDH). Coax is just a way to deliver services "on last mile" to the subscribers. Fiber is better in many ways but also in many cases it is still better to use old fashion copper; for ex. using coax you can not only carry payload (signal) but also power for amplifiers and probes that monitor the network. In case of fiber you have to have separate power supplies.
And going back to the topology; modern FTTH networks are passive optical networks. It means that you have one single mode fiber feeding optical splitter and from there multimode fibers running to the subscribers homes. This is very rear to have individual fibers runs from central office / head end to the homes. So forget about star topology.
Why copper coax is not used for transcontinental / transoceanic cables? Because fiber for THAT JOB is more cost efficient. But using your logic I should drive semi-truck to commute from home to work in city.
Fiber is still more expensive to install and maintain in home / residential environment. Electronics working in optical domain ain't cheap. Simple FC connectors cost from $3 to $20 a piece while RG6 coax connector is less than 50 cents. It does not look so bad if you need to buy few pieces. But lets say you need to wire whole building with 200 - 500 units. So you need to have twice many connectors, right? Those things stay at customer's premises. Service provider have no means to control their conditions. If Mr. Jack decides to do some "improvements" and damage that hardware then the service provider has to repair it. They have to send well trained tech, which costs more money than trained monkey such cable guy / phone guy.
And concluding; DOCSIS 3.1 can deliver TODAY nice speed of 1Gbps without need of drilling new holes in your house. All what you need to do is to swap your existing modem. And in most cases you don't have to live in a center of the big city.