Hmmm... I was replying to a post from moe and it disappeared. I'll put my post here, though it's a little out of context now:
Hello guys, I need some help.
I currently subscribe to Comcast for my internet services @ home. I have a cable modem from them, which I lease for $7/mo. I'm looking to buy one so that I dont have to lease it from them. My problem is that I know squat about cable modems. If you go here http://mydeviceinfo.comcast.net/mydev.php?tier=2&h=0&d3=0&s=&so=&e=0&sc=368 and select the "Blast!" service under the "Residential Speed Tiers", that's what I have. Basically, my speed is about 20mbit/s down and 4mbit/s up.
I'm lookin at the list of "Approved" modems on their page, and looking for those models online, but they seem a bit high priced. My question is... Are modems like routers where they all go by the same standard and you can safely pick just about any one and it's a matter of brand names and stuff... or... do I have a risk of not being able to use it if I dont buy one that's listed on their list?
I'd like to learn as much as I can before I make the purchase.
Thanks in advance guys.
For me this is a great topic because if I could stop leasing my modem from Comcast/Xfinity I would be super happy.
Here's my understanding of things (as of about 2 years ago):
-If you use Comcast's phone/landline telephony service then you may not be able to purchase your own hardware because I believe they will not register a telephony device that they do not provide themselves; not to mention they used to be hard to find for purchase. I've looked into this once in the past and my conclusions were that you HAVE TO use their telephony modem or no landline through them. It also seems they've "wrapped" the lease charge up into some other telephony service charge such that you'd still be paying the ~$7/month regardless of using their hardware or not. Since none of this was direct from Comcast's mouth I could very well be wrong on some of this.
-You'd want to most recent DOCSIS version (v3, I think) to allow for the fastest bandwidth.
-I do not think that off-brand devices would be a problem, but purchasing from a place with an open-box return policy may be in order.
-I used to use a personal Linksys docsis v2 cable modem with no problems, but when we upgraded to their telephony service I was stuck having to use their hardware.
-Yes, my understanding is that basic cable modems are like routers in that they're interchangeable. On the other hand, if the cable company uses some kind of proprietary connection protocol then you may be stuck with the ISP's hardware, but I do not believe this to be the case with Comcast. When it comes to cable modems (at least with comcast), they register the device on their end and they "control" the device (i.e. they do firmware and other related updated from their end at their wishing); the home users view of the modem configuration is read-only.
This may be the best place to look for information regarding your questions:http://www.dslreports.com/forum/comcast
I've briefly just checked it out and am seeing that folks have the potential to buy their own triple-play (telephony) modems for a large cost from (at least) Best Buy - this is news to me. I guess you've sparked something for me to research again.