DOCSIS 3.1 -4.0 Decoded: Unleashing High-Speed Internet for IT Pros
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- เผยแพร่เมื่อ 8 ก.ย. 2024
- 40 % of Americans obtain their high-speed internet access via a cable company. A complex RF technology called DOCSIS provides the framework for download speeds up to 10Gbe to your home. We will explore how cable companies use an RF transmission line to deliver high-speed data to your cable modem. We will look at major problems that impact packet loss and data flow to your home. We will not cover video just data. We will look at CMTS, the hybrid fiber-coax distribution system, and your modem.
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This doesn't really apply to my job, but i really appreciate your effort put into all these videos. I also like how you don't shy away from complex topics and don't insult your audiences intelligence.
Thanks for the support and comments!
This is a great explanation. I use every piece of equipment in the video, and then some, from the hardware to software and tools (we just changed FVDs to the red one). RFoG is a PITA because it has a lower SNR than the rest of the network because of the EDFA amps in the clamshells. VHUBs are the same. EDFA out to optical splitters to other nodes. Since both have lower SNRs we couldn't specify static pass/fail parameters for nodes because VHUB and RFoG wasn't able to meet spec. The SNRs were ranging around 36-37db. Other nodes are up to 38.5-40 db. New Node+0 are hitting 42 db SNR because the node area is so small.
We decommissioned all the RFoG in some areas and it's coming to other areas. Install the GPON beside it and move the fiber jumper over to the next port on the LCP.
My area is RPhy and breaks all the rules with a Node+5 setup and 1976 coax still in place. We are serving up 2gig down 300mb up on a mid split node with QAM and OFDM/OFDMA. Once the QAMs go I believe we will open up with 5gig/800mb and then turn it up from there.
Love the great information you shared!
@@TechsavvyProductions I would love it more if the call I am currently on didn’t involve one of the two VHUBs we haven’t decommissioned yet…😔
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Thank you for a great piece of knowledge on your part. I've always been interested in data transfer technologies. I am currently on vacation and in a rented apartment I have access to the Internet via a coaxial cable (Modem Arris CM820 Docsis 3). In the apartment where I live permanently, I have optical fiber, which is becoming the most popular in Poland.
I understand why so many people in the US still access the Internet via coaxial. The investments made over the years and the built infrastructure cannot be replaced overnight. Thanks to the great engineers who have developed new versions of Docsis, the coax will be able to be successfully used for the next years. Greetings from Poland.
You are correct in understanding why cable is the preferred method of getting the internet for most areas in the US. DSL is popular in the northern states and some areas have fiber. Dziękujemy za oglądanie naszego kanału!
Small correction to the speed slide... Comcast (Xfinity) does not do 6G on coax; that's a fiber speed. I think 2G is their limit for DOCSIS.
"a long way from 28.8..." and you show a 14.4 modem. I love it. (not that many today remember analog dialup)
Love the feedback and information!
Great Video, been playing the attenuation game since my upload upgrade. All Good now!
Thanks for the feedback!
The CMTS also sees wide spread outages in the network It also does diagnostic , turns bridge mode on and off and shut down the internet access when you don't pay the bill.
John, correct I could have done a 30-60 presentation on just CMTS!
That was a good video. I have to admit I opened the web page on the modem while I watched and checked levels and looked to see what level of DOCSIS I have. It is an old Motorola Surfboard, and has run constantly for about a decade now.
I have no complaints with my cable delivered internet service, except when there is a power outage in the area, since the old POTS phones are on a VOIP to analog adaptor. It is then when to repeaters fall to their battery backup systems and, depending on the duration of the outage, my Internet service will also fail after the weakest battery in the system depletes its energy. The telephone company, in the old days provided battery voltage from the main office, and light usually travels a greater distance without the need to compensate for the loss on glass systems.
I like to use the analogy of a long tube with a smoke ring wafting through it to visualize surge impedance discontinuities. Any dents or deformities in the shape of the tube will make the smoke ring lose some of its smoke and won’t make it to the other end.
Thanks for watching
This is a very nice overview. The reason for Remote PHY / MACPHY (RPD) could get some more attention. With a classic CMTS the fibre will still carry an analog DOCSIS signal. With an RPD this fibre will carry digital signals only. Typically this is an Ethernet pseudo wire. Traditional nodes can be called Analog Node and the new nodes are called RPD. The example pictures show a Technetix DBE with a Remote-PHY module in the lid. In a later slide this RPD module is shown stand alone but referred to as Node. Main advantage is that the quality of the DOCSIS signal is not impacted by the fibre. Lower cost lasers can be used. The CIN network can be used for other services as well.
Appreciate the comments and feedback!
Great video.. Well explained What and How Access Network works
I am really please how many interested folks in DOCSIS have been watching this technical video. You folks are amazing.
Were with Shaw/Rogers we have IPTV there fading out the cable boxes. Great video
Cable TV is in serious decline.
Thank you for all your videos! Step-by-step explaining of everything regards communications. Working for Xfinity, soon moving to Cisco Networking. Once more, thank you for all your videos!
Thank you for your support and comments!
Thanks for this detailed and informative video! I am currently having an issue with my cable provider and I was am curious to know the general function of a cable network, coming from a datacenter background cable networking infra is kinda new to me and this gave me some great insight!
Glad I could help!
Thank you, I’ve been very interested into this lately, can’t wait for DOCSIS 4.0 to come out
Thanks for the comments!
awesome video, thank you so much for posting all this information publicly and making it freely available... :D
Thanks for watching!
Thanks for the advice that makes sense to me!!
Glad it was helpful!
At 1:50 you refer to gigabytes, while the value is in gigabit per second. I guess technically that can deliver 6 gigabytes, but so could any other connection.
Thanks for the otherwise great video! It's hard to find good information with decent production quality on nieche subjects like this.
Thanks always for the feedback and taking the time to comment!
спасибо большое, самое толковое видео на тему в ютубе!
Спасибо за просмотр!
Ευχαριστούμε!
Thank you for your support!
Always waiting for your new video
Thanks for the support
Great explanation
Thanks for watching!
Thankyou Sir for one more video
Thanks for watching!
Very interesting! Thank you 👍
Thanks for watching!
nicely done.
Thank you! Cheers!
18:30 - We're doing today ~600km from CMTS to FN with Pebble or switching from 30km to 600km (backup) link with no cable modem lost - just few pings.
Nice explenation, but a lot of this information is outdated.
28:50 - 1GHz? We're working above 1GHz, also - nope, 700MHz to 862 needs to be OFDM since it's being taken over by cellular. Again - nice but outdated.
Love the feedback, I did not expect so many serious techs to watch and review. It is a subject that few seem to be interested in. I am fascinated with DOCSIS and how ethernet is delivered to last mile. I have had many great comments and good feedback on this topic from guys working in the field. Appreciated.
Not necessarily. There have been operators with QAM channels in the 700MHz band. It generally works, but you should keep your cell phone away from the modem (or stb.) There's also a 600MHz band. (in other words, if you keep ingress to a minimum, stuff doesn't break.)
I’m hard core baby!
Awesome!!
LV is the man !
Thanks for watching!
CMTS input/output - this is a bit confusing since all ports on cmts chassis and cards are both i/o. Going downstream from the ip side of the CMTS it is generally fiber or Ethernet. On the RF side (to the modem) i have almost always seen coax off the CMTS. After combining, it becomes fiber at the transmitter where it exits the headend.
Appreciate the feedback and information, always welcomed on this channel!
Not exactly. Newer D4.0 era hardware (remote-phy) is IP/Ethernet from the vCMTS. But older ("in use") technologies are entirely RF at the CMTS, with discrete US (upstream) and DS (downstream) ports. That RF is then converted to an RFoG optical signal for transport to the various nodes closer to the customer. (hence, HFC - hybrid fiber-coax)
It´s so hard to belive that US uses so much DOCSIS to this days. Here in my city on south of Brazil I have at least 10 Fiber providers that I can chose.
Great point! Cable companies and Telcos have the US locked up. Google Fiber once was a up an coming competitor but it is very difficult to move infrastructure through Federal, State and Local bureaucracies.
To further what was said, you have fiber providers, but they don't offer the fastest speeds. Fiber is a transmission media and has no speed capabilities. The transceivers make the speed and the core network moves the data. A weak core, or lower speed tranceivers are going to affect your speeds along with internet access. Cable and Telco providers operate Tier 2 networks and connect to a Tier 1 network. A Ter 2 provider can have the worlds best last mile, but if the core can't handle the data or they haven't bought enough Tier 1 access, you don't get the speed capability.
Given the amount of cable and fibre already present, what is so hard to believe? Analog nodes that go back to a headend have a single fiber feeding a neighborhood. Now digital nodes (RPhy) multiplex on the same fiber via DWDM and I can put 40 of them on a fibre. Then you change some cabling and split an area that was served by a single node into six nodes fed by dual 10gig connections . Now you have nodes within hundreds of feet of the house and the RF is created in the RPhy clamshell. You can prep the neighborhood at night and then swap the node when you are ready..
Cable is also supporting an old TV network (QAM) and a new network (OFDM/OFDMA) at the same time. Going to fiber would cut off the old network immediately and you would have to replace all that equipment. People that run fiber new just offer streaming IP services and don't have any existing customers to worry about.
Since the RPhy node has a digital connection, you can bury fiber to it and swap out the RPD and the RF portion and make it fiber PON and still use the same connection and SFP. It is in the upgrade path. First 10/2.5 gig. Then 10/6 gig. Then PON. The main coax cables carry electricity to power the remote equipment. The coax will also power micro cells and the channelized fiber will connect the micro cells to the cellular network and it's all on battery backups.
Really. But coax cable networks have been around for many decades. Replacing it is really expensive, so there's very little desire to do so.
What's the difference between GBs and GBe in your comparison of providers? or was that just a typo?
GBs = Giga bytes per second, Gbe = is a short hand for Giga bit per second ethernet I often say the Giga Bytes (8 bits) per second when I should have said Giga bit per second. Network speeds are almost always shown in "b" bits per second. Bytes "B" (8-bits) can be used and is often a metric that can be used to measure traffic. I will try and be more accurate on this as it adds confusion to the listener. Feedback is welcome!
"PromoSM"
Thanks for watching
if docsis is just software and framework why cant 4.0 just be released so us 35 mbps upload cable users can finally get a nice upgrade. what's the hold up the American internet is trash!!!!
Great question, Docsis upgrades are very expensive for the cable provider, it involves a major financial investment; new cable modems to all subscribers, labor and materials to upgrade infrastructure, and massive configuration changes in the entire environment. Could involve fiber/new amplifiers in the distribution chain. A lot involved.