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Forum Discussion
CM1200 Dropping connection intermittently - SYNC Timing Synchronization failure
Bought the CM1200 about a month ago and since it was setup by RCN(isp) I have had it seemingly randomly dropping internet connection. When it drops connection the downstream light will be blinking an...
second screenshot
Ok so it happened 2 more times today and I just took a screenshot of the event log before restarting the modem to fix the issue and I noticed some different messages. After the modem had restarted I looked at the log again and these messages were missing so maybe I have been missing these. One of the new ones is "MDD message timeout" (i attached the logs). Also during this failure both the upstream and downstream lights were blinking.
Your modem power levels are all over the place. the downstream channels should be within 3.5dbmv of each other. Yours are way out of this. Did rcn check the line?
Did you remove any splitters, amplifiers, or attenuators?
check the line for damage, kinks, old/bad/cheap connectors and cables.
RCN did check the line and they said they didn't see any issues with the power levels, but they seemed to just reference the levels on this page http://ny.speedtest.rcn.net// which just shows one number for each FwdSNR, Channel Pwr, and Transmit Pwr (not sure where it gets the number for these since there are multiple channels. Maybe its just the average). I did remember when internet was initially set up in my apartment the technician opened a panel in my closet that had some cables behind it specifically the line for my unit then a female to female connector that connects that line to the main room wall jack and another unused line that goes to the master bedroom jack. So I went ahead and connected the modem to the mainline coming into the unit (still using the female to female connector since the line in the wall doesn't go far enough). Power levels look marginally better (See attached) still not within 3.5dbmv. Will try connecting without female to female connector as well to see if that changes the power levels at all. Appreciate all the help.
