 GeekNJPremium
join:2000-09-23
Waldwick, NJ | [OOL] DOCSIS 2 vs DOCSIS 3 modems I see various comments from folks about getting a DOCSIS 3 modem and they think their speeds will magically improve. I don't follow the forum much any more and a search here didn't turn up anything so I figured I'd ask.
Forgetting the future and looking just at right now, if someone has a D 2 modem and replaces it with a D 3 modem, will anything be different with their connection? Specifically will it be faster? If not, fine, but if so, is it based on their specific tier of service (basic, Boost or Ultra)?
Changing the MAC address of the device connected to the modem and restarting the modem could get you a different channel which is less congested, but you don't need a D 3 modem to accomplish that. I'd appreciate facts based on the technological reasons vs "I replaced mine and it was faster but I don't know why" which could have been just getting on a different channel.
If there's a thread already on this I couldn't find it but search here in the forums is pretty lame. A Google search filtering on just DSLReports didn't show anything useful in the first couple of pages. If this was previously discussed and someone has a link to the thread, that would be great and we don't need to rehash it here.
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TheWiseGuyDog And ButterflyPremium,MVM
join:2002-07-04
Yonkers, NY
kudos:1 Reviews:
 ·Optimum Online
| said by GeekNJ:Forgetting the future and looking just at right now, if someone has a D 2 modem and replaces it with a D 3 modem, will anything be different with their connection? Specifically will it be faster? If not, fine, but if so, is it based on their specific tier of service (basic, Boost or Ultra)? Hi Geek how is FIOS, no need to answer and tout it in this forum which I know you would never do, since I am sure it is fine and you love it.  
A Docsis 3.0 modem can use more than one downstream channel and at this point OOL bonds it to 3 downstream channels versus the 1 downstream channels for a Docsis 2.0 modem. So the capacity for that modem and the all the other modems on the bonded channels goes from 38 mbps to 114 mbps. Therefore it is like having a 3 lane highway versus a 1 lane street, it adds a lot of capacity. Now that capacity can fill up and you can end up with slow downs but it many ways it is like a node split.
So yes replacing a Docsis 2.0 modem, if you are experiencing congestion on its one lane road, with a Docsis 3.0 modem, would relieve that congestion, UNLESS the 3 lane highway is already congested.
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Warning, If you post nonsense and use misinformation and are here to argue based on those methods, you will be put on ignore. |
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GeekNJPremium
join:2000-09-23
Waldwick, NJ | Thanks for the explanation! |
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 jaaPremium,MVM
join:2000-06-13
kudos:2
·Optimum Online
 ·Vonage
| The downside of D3 is the modems seem to be more susceptible to signal issues, including ingres. Many people have "demanded" their D3 modem, just to find that it did not fix the issue they were experiencing.
More channels increases capacity, and bonding reduces the likelihood of getting stuck on a congested channel (3 bonded channels provides more than 3x throughput).
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 MxxCon
join:1999-11-19
Brooklyn, NY | reply to TheWiseGuy
said by TheWiseGuy:A Docsis 3.0 modem can use more than one downstream channel and at this point OOL bonds it to 3 downstream channels versus the 1 downstream channels for a Docsis 2.0 modem. So the capacity for that modem and the all the other modems on the bonded channels goes from 38 mbps to 114 mbps. Therefore it is like having a 3 lane highway versus a 1 lane street, it adds a lot of capacity. Now that capacity can fill up and you can end up with slow downs but it many ways it is like a node split. Here's visual illustration of what that looks like. Can you spot where docsis3 modem was installed?
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| reply to GeekNJ
for both of my locations... a d3 modem made speed rock solid. |
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| reply to GeekNJ
Like you stated originally its not a magical fix. In my development cablevision is slowly replacing all the coax fron the units to the outside of the devlopment to the node hardware . Now my speeds are 1- 16.5 /2/02 most of the day.
IT will not help if its outside equipment problems , only if its congestion related |
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 RARPSL
join:1999-12-08
Suffern, NY | reply to TheWiseGuy
said by TheWiseGuy:A Docsis 3.0 modem can use more than one downstream channel and at this point OOL bonds it to 3 downstream channels versus the 1 downstream channels for a Docsis 2.0 modem. So the capacity for that modem and the all the other modems on the bonded channels goes from 38 mbps to 114 mbps. Therefore it is like having a 3 lane highway versus a 1 lane street, it adds a lot of capacity. Now that capacity can fill up and you can end up with slow downs but it many ways it is like a node split.
To add to the above (which I agree is accurate), you can also think of Bonding like having 3 buses each able to carry 38 passengers. With a D2 modem, you are only allowed to ride on one designated bus route (one bus of which comes every 5 minutes). You have a group to transport but the number of people on you can put on the bus is restricted to how many other people are already on the bus. Thus if the current Channel 66 bus has only 10 seats left and you need to transport 20 people, you need to put 10 on THAT bus and have the other 10 wait for the next Channel 66 bus (and hope it has 10 seats left). This is the equivalent of needing 20Mbs to send a file in a designated amount of time but only having 10Mbs available due to congestion. It will thus take twice as long to send the file.
D3 Modems allow you to spread the load across 3 buses at the same time. You can put 10 people on the current Channel 66 Bus, 7 on the Channel 67 Bus, and the remaining 3 on the Channel 68 Bus. Thus your 20 can travel at the same time (along with provision for 94 others).
The idea of Bonding is that the modem will use the least congested channel that has enough current capacity or if none can handle your needs to spread your load across the channels. |
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