Does anyone make an internal cable modem?
Unfortunately not. I have also thought about building my own cable router, but there is no alternative to an additional modem. AVM has a quasi-monopoly on cable routers in Germany.
Another thought about this topic.
DOCSIS is a transport medium for internet access, requiring special drivers and software. Especially for authentification of the customer of an internet contract.
Therefore I think it is best to leave these tasks to the ISP, which delivers the internet traffic at a standard network interface ( ethernet ).
With this you can determine where a fault exits, mostly, on the DOCSIS part or the local network.
For a good functioning of this concept it is necessary, that the ISP HW acts as modem ( DOCSIS <—> Ethernet ) only. But more and more ISP tend to a modem/router combination.
For how it functions, it should be always a separate device. docsis 3 is still new so there is not many choices, but it shouldn’t be an issue.
The problems with docsis 3 is mostly associated with infrastructure change and even the older style of connectors on the RF coax can cause issues.
Problem with cable modems are their wimpy processors they put into them then bottle neck the connection with a 1 Gb interface.
My cable provider hasn’t upgraded to docsis 3 yet. But I imagine they probably skip 3 and go to 4 since they have to change and remove amp nodes in the system and force everyone to change their modem because the signal requirements are way different so much that a docsis 3+ signal from the cable system will fry a docsis 2 modem.
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Found this… i have no idea how much or how to acquire. Or what else you would need to do to make it work in a system as a cable modem.
You would have to program it as that is an evaluation board. Xylinx was acquired by AMD about two years ago so these series of chips were held up in production as well as a lot of DSP chips used elsewhere like in the audio recording sector. Also some other things to consider, is just because someone in a lab can get a 10G communication doesn’t mean its going to work that way when applied on an aged cable system. I would think about 1/2 that speed is going to be reliable. So I would only expect docsis 3 is going to run 5-6Gb on the average at its best.
To aquire one, you would go through the channels a hardware developer uses and its going to be really expensive to acquire so I would just wait and see which cable modem starts using this chip and buy an end product instead of paying 4 to 5 times more for something you have to write the firmware to make it work.
At least someone is developing nicer processors so these modems can be built with a SPF+ port instead of a 1Gb interface.
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