DOCSIS Explained - Do You Need a New Modem?

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Docsis is the technology that allows you to connect to the internet over cable wires from your ISP. Different versions of this standard allow for different speeds, so how do you know if your modem is good enough? I explain DOCSIS and what it means for your internet speed.
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Finally someone who could explain how modems work and if I have to replace it in terms of speed when I’m upgrading my internet speed and my router! Thank you!!!!

Liz_A.

2:50 QAM is a modality to use one channel multiple times, by sending signals in de-phasing orthogonal modalities, but at the receiving and seding end. This upgrade the speed for sending and receiving decoding.Great video man!

moltoor

You want the modem with the max amount of channels you can afford. Comcast in Portland uses 24 channels. In that case, you want to buy a modem with at least 24 down, 4 up even if you have the slowest speed. These extra channels add redundancy and load balancing during congestion/peak demand periods. All docsis 3.1 modems go up to 32 down and 8 up when in backwards compatibility mode. I would recommend a 3.1 modem to future proof.

DraculaxAlucard

I had this issue recently. I ordered a 3.0 modem a few months ago which had 4 channels. Last week, I got a letter in the mail from my cable company of a promo where I can upgrade to 150 Mbps for an extra $15 a month (total $50). I thought it was a great deal until I saw my speeds. I was only getting about 135-140 Mbps at the most and wondered why. I soon found out that my modem (Moto SB6121) couldn't support the higher speeds. I called back the cable company (Bright House) and asked to go back down to 75 Mbps for $35. They also told me that they are boosting everyone in my neighborhood to 100 Mbps for free (like you said) next month but since I went through a lot of trouble, they will let me get a head start.

What a coincidence you made this video.

AndrewMackoul

Whoa. 1080p60fps. So HD. So vivid. So crisp and clear. The new camera is nice.

BrianCalderon

QAM is where you have n levels of amplitude and n offsets of phase (a sine wave cycle starting at various angles). If you graph amplitude one axis, phase on the other, you will see qam 4096 will make n=sqrt(4096)=64, so you will have 64x64 dots. 64 levels (0-63) is 6 bits of resolution, so since there is amplitude and phase you get 12 bits per cycle. there may be exceptions like you can not measure the phase if the amplitude is 0.

AviRotstein

dude you are amazing! i had a docsis 2.0. and got a new docsis 3.0 now. with comcast i went from 35 mbps download speed to 80 mbps. youtube please send thio some money for this incredibly informative video.

TG-Maverick

Also, if you ducktape AA batteries all the way down your ethernet cables itll boost your speed depending on how many you use. It uses the electromagnetism to push the data faster. I hear that DOCSIS 3.1 uses really strong lithium batteries inside the modems.

craigreustle

Hi ThioJoeTech, thank you for making and posting this video. (I think I wasted $ purchasing a new modem [DOCSIS 3.0] to replace my Motorola Surfboard [DOCSIS 1.1, 2.0]). (I have a low price Internet Service, where down speeds don't exceed 21 Mbits, and it suits me just fine: I don't need a faster modem). With the orig Motorola, I was losing the ISP signal on and off, at random times, (variable lost service durations) over the past two weeks. ISP people told me to try a new modem (they thought it would solve the problem). (I mistakenly thought issue was due to a failing, older protocol modem). The new one has dropped Internet Service a couple of times already, in the past two days of ownership. (The upload/send speed drops from High speed/bonded channels to just 'connected', triggering an ISP interruption, for a few minutes). Just sharing. (Any/all thoughts appreciated). Thank you.

tonyd