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3com Cable Modem CMX

Y

Yobbo

Senior member
I have had this modem for a while, but it seems to be getting worse and worse. I can still d/l at top speeds, but after a few minutes it would disconnect me.

I tried my friend's cable modem and it worked fine for like 24hrs straight (I d/led over 10 gigs without any problems)

Its not the NIC or the Cable Company, so I think its the cable modem (I swapped his for mine for the test, everything else stay the same)...any ideas? Should I contact 3COM?

Thanks
 
Could be, but some modems manage line noise differently than others. What brand was he using? The Motorola SB's are among the best at holding in while others drop out.
 
Thats exactly what he was using; a Motorola SB4100...is there anything I can do to reduce line noise, or should I just get a motorola?
 
Just got off the phone with the cable company, they say the connection is rock solid (as close to as no noise as you can get, he insisted) and insists that its the cable modem, any suggestions?
 
This might take some effort on your part since I have no idea where your friend lives or who the provider is. I would get his Motorola modem back on your line, using the exact connector you are using now, and then run the following IP in the address field.

http://192.168.100.1/

This is the internal diagnostic page for the Motorola modem. Check the power for the up and downstream levels and the signal to noise.

As a rule, the upstream power (and sometimes noise) is the problem when connection issues pop up. See if your S:N is at least in the high 20's to 30's. Also see if your upstream power is below 60dB. Forward will usually work well from +5dB to as low as -15dB.

For the end user there is no magic number to hit since forward and return levels all vary depending on the configuration of the cable network. The numbers I have listed are near the end of the window for what is considered acceptable for reliable operation.

Motorolas hold up near the operational edge better than many other brands, which is one reason why I am using a SB4200 right now.

As far as the cable company being able to see the noise.... yes they can check, but there are several places where they might be looking and may miss your modem. You should do the check yourself and be informed of what is happening on your end.



 
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