Rating: 
Summary: Disappointed
Review: I bought this modem in January of 2002. Since March, I have had problems with the cable connection: I had many issues where the modem was very tempremental and would work as and when it desired. Not knowing that it was the modem that was the problem, I got into a large skirmish with the cable company. To prove that their line was not faulty, they installed their surfboard modem and that worked. Since July, I have been trying to contact 3Com. Cant find a number anywhere! The few numbers that are mentioned on their website take more than 4 hours to transfer to the customer service person at which time the line disconnects. I am fed up and dont know what to do.
Rating:
Summary: Garbage
Review: I bought this on the reputation of 3com and the price, I hooked it up to my cable provider, provided the info and it would not negotiate with their DHCP server, the cable company suggested a bad modem, no problem, I can understand that, it happens, So Amazon takes care of business, promptly apologizes, sends out a new modem and I call the cable provider and have the same scenario. I contact 3COM who tells me this is a pretty old modem and suggests that the ISP download the latest firmware 3.2.20, Hey I understand that, one problem, The ISP cannot communicate with the modem and 3com tells me only the ISP can down load the firmware, I can't even send it to 3com to be downloaded, they don't know how.
Lesson learned, Price does matter, spend a few bucks more and stay within the tech curve. BTW 3com no longer offers home connect products in way of cable modems.
Rating: 
Summary: Works for @Home Arlington, TX
Review: I disconnected my Motorola SB4100, plugged in and connected my new 3Com, and let it do its thing. It took about 3 minutes to sync with the local service, but after that I registered the MAC with my ISP and here we are.
Rating:
Summary: It took a day to work
Review: I followed the advice from other buyers (which was better then the support from At@t in Chicago), and the modem did not work. But after leaving it plugged in for a day, it eventually found the signal, and it works fine.
Rating: 
Summary: 3COM 3CR29210 does work with ATTbi in Oakland, CA
Review: I have ATTBI in Oakland, CA and had previously tried without success to get two different Linksys modems to connect to the cable. Having read all of the reviews for the 3com product, I decided to try it. Initially the status light was a steady red, indicating that it could not sync to the cable, and I was unable to register it through sas.r2.attbi.com (which I also tried to do over a separate dial-up modem). ATT scheduled a technician to come next week. I decided to try inserting an attenuator in the line, and voila! everything now works. The initial speed was very slow -- 22 kbps, but, as I had read, resetting it took care of that, and now it runs as fast as 1700 kbps.
Rating: 
Summary: Be cautious: model line discontinued.
Review: I have used a 3Com ISDN LAN modem for years with no problem, but when I looked at this one, I found it was not compatible with my cable system and was part of the 3Com home product line that has been discontinued. I think that means upgrades to the firmware are unlikely and that overall the support will be a negative.
Rating:
Summary: How to install 3Com cable modem for attbi.com
Review: I hope this could help other attbi.com users and perhaps other users as well.1. REGISTER the modem with cable modem ISP. With attbi.com, you register this via tech support chat. Very friendly and nice peeps.
2. Uninstall the leased modem and install the modem. Make sure you plug in all the way.
3. Wait till the modem picks up the signal. It may take several minutes.
4. Return the modem to the nearest ISP office. Have fun.
Rating:
Summary: Not for Comcast in DC Metro
Review: I just got off the phone with Comcast help desk and finally (after 4 days) they determined that they DO NOT support the 3CR29210 or 3CR29220 models. So I have a doorstop! ASK FIRST for assurance that it IS supported!
Rating:
Summary: 3Com Officeconnect cable modem
Review: I just installed one yesterday, and absolutely NO complaints whatsoever! Very easy to hook up with Comcast in my area, and seems to work a little faster (in my humble opinion) than the RCA cable modem from Comcast. I do wish that it had an on and off switch like the RCA, though. I can't review any manufacturer support since there were no problems with installation (a good thing!). Just be sure that this modem is compatible with your cable system before you order it (call them to be sure).
Rating:
Summary: It works fine for me for @home service
Review: I know there are some people have problem with this for @home but it works great for me.
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