Help with 3com CMX modem, please!

VinY

Senior member
Oct 9, 1999
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My ISP is Optimum Online in Connecticut and I joined with them around a year ago. At the time, I bought a 3com CMX cable modem and it worked fine for a few months after that. Then my connection started dropping out. The power, status and PC link status lights stay green as usual but my activity lights blink orange and my session will drop out. AIM drops, streaming MP3's stop, and I can't connect to any sites. 30-45 seconds later, the connection comes back up and works fine. Right now I have my modem connected to a Coyote Linux box sharing the cable over an 8 port hub to two computers. I thought this propagated the problem but even when the modem is connected to one computer using Win2k or Windows 98, and the connection is stressed, the connection drops as described above. I can make it go out very easily by stressing the connection (AIM open, streaming Digitally Imported trance, browsing, and downloading from newsgroups at the same time).

I called Optimum Online and they sent one of their "technicians" out to check out the problem. He said my signal was low so switched its position on the cable splitter and the signal instantly went up to spec. We went back on my computer and I easily replicated the problem and the connection dropped as usual. He then persisted to tell me that it is a problem with my system. The thing is, the problem happens on two different computers, two different operating systems (Windows 2000 and Windows 98) and on two different network cards (Netgear FA310TX and Linksys LNE100TX). The cable company uses the easy way out by saying that since it isn't the signal, it's my system, and they'd need to send someone else out at $xx.xx per hour to "fix" my computer. There's no way I'd pay to have someone come out and "fix" my system for me when there's nothing wrong with it. I have been leaning toward it being a modem problem since two of my friends have the same modem and their connections also drop easily by using a lot of bandwidth and stressing the connection. On the other hand, another friend of mine has a Terayon modem and has no problems whatsoever with dropouts, also being connected to a Linksys router.

I do not know how to remedy this problem, since 3com has not addressed the problem and my cable company plays it off as my computer systems being the problem and runs me in a circle. Can anyone tell me how to fix this or how I can get my cable company to give me a new modem? I've tried calling and talking to them and their stupid techs just tell me there is nothing wrong with my modem after they've pinged my IP several times (friggin morons, like pinging the connection will explain how my connection drops). Any help is appreciated here, thanks in advance!
 

Guilty

Senior member
Nov 25, 2000
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This is an inherant flaw of the CMX series. Most people on other ISP's wont ever notice it because they dont get anywhere near the bandwidth of Optimum Online users. At 6-8Mb/s downstream, the modem just gives out for 30-60 seconds. I've talked to optimum about this, they know about it, but since you BOUGHT the modem from the WIZ, they arent obligated to do anything. They get to say "Return it to 3com". Sorry but thats the reality of the situation, it has nothing to do with your system. You could buy a new modem, like the SB4100 or 3Com Sharkfin, and then sell the CMX.
 

VinY

Senior member
Oct 9, 1999
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Guilty: Thanks for the info. I knew all along it was a modem problem. As you said, the only problem is that neither 3com nor Optimum Online will address the problem. This is running us in circles...
 

luv2chill

Diamond Member
Feb 22, 2000
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yup--the CMX is a POS for sure. It's flaw is caused by overheating apparently (I read this over at the dslreports.com forums).

Unfortunately, there's no fix--you'd need to get a different model.

l2c
 

Guilty

Senior member
Nov 25, 2000
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Yeah I know how annoying the run around is. I much prefered when OOL rented modems and didnt require you to buy one. Also, I find it a bit outrageous that the WIZ sold us these 3com CMX's back a year or more ago, with us assuming they would work fine. I mean the WIZ is owned by Cablevison, and Cablevison runs Optimum Online, who would think there would be a problem? But there is and they can avoid having to do anything about it because it's just another product that a customer bought from a retail store. Especially when we can reproduce the problem virtually instantly for them in front of their eyes, they should have some compashion for the people who bought the modems.
 

VinY

Senior member
Oct 9, 1999
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Overheating eh? Might have to strap a 120mm fan to the back...

Guilty: Exactly. I can reproduce the problem in front of the technician when he is here but as long as it is not a signal problem, it's a problem with my system. They don't even consider the fact that it could be the modem. I am looking to get a new modem but I don't want to be out $150+. I'd much rather have Optimum Online replace a piece of equipment that is defective.
 

VinY

Senior member
Oct 9, 1999
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I figure if I could get something in writing of the problem from 3com, I could maybe get an exchange through Optimum or 3com. Any other ideas?
 

Guilty

Senior member
Nov 25, 2000
427
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Optimum's policy is to tell you to send it back to the manufacturer if its defective. Some people have said they got a new modem, but my attempts at this were futile. I'm not sure what 3Com would do if you sent it back, send you a new CMX? A different model? Tell you its fine? Plus you'd be offline for however long that process took.
 

Lon3W0lf

Member
Dec 14, 2000
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Hahahaha - thats funny sh1t vinY. /<sarcasm> How bout a blow hole? or better yet some water cooling? anyways we need someway to get Opt Online or the wiz to replace this monstrosity. We need to set up some petition so we don't have to worry if the cable will drop every five minutes.

I say we steal all the Wiz's cable modems and light their stand on fire. I'm talking about the stand at the Post Mall in CT but, if there is an actual store you can burn that down too.

crazyness, peace, fire

lon3wolf
 

Guilty

Senior member
Nov 25, 2000
427
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I find it hard to beleive the modem heats up to the point of not being able to forward packets properly and regains the ability in < 30 seconds. I think the modem just cant handle 6-8Mb/s down and 1Mb/s up, but as I mentioned the GREAT majority of cable users across the country wont come near these speeds, it's an issue that Optimum users have noticed due to the above average bandwidth we have.
 

VinY

Senior member
Oct 9, 1999
933
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0
I'm gonna try calling 3com now and see what they have to say. I'll post back some results.