and I generally direct people to dslreports.com to see what the users there say, while a bunch of anti cable mongrels they do know their user side hardware fairly well, just don't necessarily trust their over the computer diagnostic of your comcast plant outside they have never touched unless they work for the company and are looking into the monitoring software to get their info.
I need to buy DOCSIS3 modem that will work flawlessly with Comcast.
The problem I have: many DOCSIS3 modems don't work well with Comcast. For example, Cisco DPC3010 doesn't, Cisco DPC3008 should work, but there are many problems that users experienced, based on googling. Motorola SB6121 also causes problems, connections disappear. Zoom 5341 also has issues. I hit this problem with many other modems listed as compatible on this page:
http://mydeviceinfo.comcast.net
Now I know, that this one model, Ubee DDM3513, works with Comcast. This is the modem that technician left for me to use on lease.
What are the other choices of DOCSIS3 modems that are rock-solid with Comcast? I just don't want to have to call them or have some random issues.
It is amazing, that Comcast network is so incompatible with various modems. Is this the issue with modems themselves, or with Comcast? I suspect that latter.
So no modem is safe the rock solid SB6120 had a bad firmware that bricked modems at one time in the early stages of D3 deployment. True story, people have screamed at me and had me leave their house becasue of it over this. they bought a modem the firmware was bad and it did not work. I am pretty sure Motorola could re burn it but I cannot and so... It happened to charter, and TWC as well, lots of pissed off people.
This was a long time ago though, they are the longest existing modem on Comcast systems so they have less issues now as all the bugs have been worked out mainly. Any modem has the potential to have some issues though. even if its rock solid now the next firmware release from the manufacturer could go bad. As someone who installs these 40 hours a week I am not a big fan of cisco/scientific atlanta, but its all firmware related, they have just had bad after bad starting with the DPC3000 [and honestly the Scientific Atlanta ones before that as they are the same company].
Zoom seems to get a good thumbs up since it now supports 8 channels on the downstream with its current chip set, which again unless you are subscribing to something over 100 Mb/s is all show off stats and nothing decisive one way or the other.
As to your compatibility question it is incompatible with the CMTS, there are 3 maybe four major makers of cable eq, Cisco/Scientific Atlanta who is trying to get out of the business, Motorola [who I think is actually trying to get out too after Google bought them], Arris, and RCA. I think I missed one, but, anyway.
They each make different cmts hardware, which stands for Cable modem termination system, and is the big system that gets put in the cable head end [bunch of computers that modulate , decrypt, demodulate, and encrypt data to/from sat/fiber feeds to HFC {hybrid fiber coax} feeds, etc...] this cmts must support a modem via firmware, config files, and boot files, if its the makers did not get with that cmts company and help them do this it is not going to work. Plain and simple. So its an issue between the modem maker and the cmts producer in all honesty. After that, it is probably a he said-she said type of thing but it may be the modem makers fault for not getting their modem supported on that cmts or it may be the cmts makers fault for not getting that modem on their system or it may just be real bad communication from both. In either case its not going to help you at this time.
As to the modems, the only thing I can say is make sure its on that list I have had one sub who bought a SB6180 and that model was not supported at that time. No idea now this was a few months ago.
Only other advise, if you want wireless get a separate or side car router not an ALL IN ONE as they pretty much all suck.
That said the list you linked is for residential only of you want business as far as I know you must not have a static IP and you can only use a few Motorola modems. Otherwise it is a ubee [only seen one but I seen it so I know they exist] or SMC gateway they provide you with is the only option and the usability of Motorola personal modems for business class may be limited by the FFO you are working out of. That is to say no one has ever been able to provide me in writing where we say this, but I have seen some businesses with their own Motorola SB6120.
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