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Question
Cable Modem keeps disconnecting
First of all, I returned home one day and got online. After 10 minutes, my internet, MSN, Yahoo all disconnected. I thought it was COX cable service...so I waited it out. Never came back online. Next day, turned on my computer ... 10 minutes, disconnected. I call COX, they reset my modem ... worked, 10 minutes later, offline again. COX said I have a clear clean connection. The lights are all blinking, everything. COX said its not their end...maybe my modem. So I switch my father's modem and mine (Upstairs and downstairs). I boot the computer, internet ... 10 mins, down again. After pulling my hair out, I figured I could unplug the modem and in ... comes back up. 10 minutes, off. So, I click Local Area Connections ... I click DISABLE then ENABLE. WOrks...10 minutes, off. I RIGHT CLICK the LAC and click Repair (I found this to be the quickest way to do internet) ... Every now and then, I sense it going offline by slowing down, so I right click and click REPAIR. Now, its not my cable modem, its not the CABLE or network (COX said I had a healthy connection). What happened? It just did this within a day. Thursday and Friday, worked great. I come home Monday, 10 minutes, off.
Someone please HELP!!!! WHY?
Scott
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Answers
what kind of modem is it?
most popular modems have an internal page
192.168.100.1
click on signal tab -
snr should be 30+ (obtimaly 35 or better - but if its not less than 30, thats not the problem
downstream pwr should be from -15 to +15 (again i like -12 to +12)
upstream should be below 58dbmv (note that 50 is a higher signal then 58 / the lower the better
if those numbers are fine - then its not the wiring in the house - if any of those numbers are out of range, you want to see if you can get a more direct line to the cable modem. this means bypassing spliters - if the modem is through a 3 or 4 way spliter, remove that and put a 2 way spliter in
a 2 way spliter takes 3.5 to 4db off signal / a 3 way takes like -9 off signal
Some 3 way splitters have a "high" leg that is only at a 3.5 db loss, these are used to get a better signal to the modem. The web page mentioned will work with motorola modems and some others, if it is a BRG modem it is quite a procedure to get to the page. If your cable company uses PPPoE for authentication you will not be able to view either page without changing your network settings. The upstream is what the modem is transmitting at; at 58 it is pretty much maxed out -- between 45 and 54 are normal levels. The rest of the advice is solid, if you are having a problem with the modem resetting itself or if the figures are high for the transmit (upstream signal level) are are low for the downstream level (this is the actual signal level he modem sees). If these levels are not right it will be a cable problem. You will want to put the 2 way splitter as the first splitter and have one leg go to the modem and the other to feed the rest of your tvs, this is something that he cable company should have done at install or should do at a service call.
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by: Mrclean0325Posted on 2003-10-11 at 22:05:41ID: 9534877
When you get disconnected does the modem "reset", I mean does it start going through a cycle like it was just plugged in? If it does, then it will be a cable problem. If not, then it has to have something to do with your computer since it is the only thing that is constant in your situation. You may have a virus or starting to have a harware failure. If possible try another computer on the modem and see if it does the same thing. If it doesn't, then you will have to check your computer. If it does, check the ethernet cable, it may be bad. Make sure that the ethernet cable is not too close to any power transformers in your power strip (had one the other day that had this problem) It will basically be a process of elimination and you seem to have already eliminated the modem. Hope this helps! ;)