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[Ars] Meet DOCSIS Part 1 and 2

post #1 of 59
Thread Starter 
Part 1

Quote:
The ideal way to build a national broadband network for access to the Internet would be with a high-bandwidth, bidirectional cable running to each individual household. But sometimes you have to work with what you've got, and in America, what we have are cable TV networks. These networks have the bandwidth, but not the bi-directional part—they weren’t originally intended for two-way communication. Worse, the cables for many neighbors all connect together, so it's not possible to send a signal to just one household. And yet, cable companies manage to provide 100 Mbps bandwidth to their broadband customers using this flawed infrastructure, and they do it without compromising the preexisting cable TV service. The tech behind this magic trick goes by the name of DOCSIS, which stands for Data Over Cable Service Interface Specifications.
Part 2

Quote:
DOCSIS 3.0 gets around these limits using brute force: it bundles multiple channels. By using multiple channels at the same time for the same data stream, the data stream can be bigger than the bandwidth that a single channel allows. By default, in the downstream direction, the CMTS will send individual packets over different channels, but each packet is labeled with a sequence number so if packets arrive out of order, they can be put back into their original order before they’re given to the user. The Internet Protocol (IP) explicitly allows for out-of-order arrival of packets—but if this happens routinely, it does slow down transfers. Alternatively, the CMTS can use different channels for different types of communication, where each channel has its own interleave level that is appropriate for the type of traffic flowing over that channel
I think it's a pretty good read since I'm basically clueless when it comes to networking.
Edited by HybridCore - 5/23/11 at 6:24pm
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post #2 of 59
My ISP is implementing DOCSIS 3.0 soon! I got a 3.0 modem to take advantage.
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post #3 of 59
Thread Starter 
Get the Motorola Surfboard Gateway. Wifi n + DOCSIS 3 FTW! I would get it but the only service I have around here is Metrocast.
Edited by HybridCore - 5/23/11 at 6:24pm
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post #4 of 59
Time Warner Cable has been rolling out DOCSIS 3 since at least 2009, which is good that they're on it. I can't complain with the speeds either. I think we just got it in my area so we can take advantage of their "Wideband" service that gives us 50/5 for $99 a month.
    
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post #5 of 59
wow, great techie read.

i've been wanted to take the docsis 3 plunge for a while... maybe sooner rather than later.

thx OP.
 
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post #6 of 59
Comcast has had some DOCSIS 3 support for a year now (I think?) in my area. 15 down is enough for my budget so 2.0 is good for now.
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post #7 of 59
Quote:
Originally Posted by dizzy4 View Post
My ISP is implementing DOCSIS 3.0 soon! I got a 3.0 modem to take advantage.
Mine already has DOCSIS 3.0 since ages ago but no (well priced residential) plans out to fully take advantage of it as of yet :/ On 15 m/bit 2 down but expensive. The best on my ISP is 25 m/bit down, 2 up. Unis and business plans easily go up to 100 m/bit +
Edited by chinesekiwi - 5/23/11 at 8:08pm
post #8 of 59
Moving soon. Sacramento. Probably going to pull the trigger on Comcast Extreme 50.
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post #9 of 59
I guess we're 3.0 here. The modem I got is D3.0 and Gigabit for over a year now. Suppose to get 18/2 but with speed boost speedtest.net usual gives 50-60Mbps down, sometimes more. Channel bonding FTW!

Our highest residential is 60/5 tho and has been for over a year.....just don't want to shell out $100/m when 18/2 is plenty for $40/m.
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post #10 of 59
Quote:
Originally Posted by Velcrowchickensoup View Post
Moving soon. Sacramento. Probably going to pull the trigger on Comcast Extreme 50.
What's the cap on that, if any?

Quote:
Originally Posted by Lxcivic2k1 View Post

Our highest residential is 60/5 tho and has been for over a year.....just don't want to shell out $100/m when 18/2 is plenty for $40/m.
18/2 for $40 is awesome, I'm paying $50 for 15/1.
    
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