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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...
I have attached screenshots(can only attach one per post it appears will attach the second screenshot in the following message) of the connection page when the internet was disconnected. The technician that came out tested the signal and line up to the modem and determined it was fine. The ISP has reprovisioned the modem twice with no issues either time. There are no splitters in use and I have tried multiple coax cables to no avail. Ethernet port aggregation is disabled. I did try enabling Enable Extended Upstream Transmit Power to fix the issue, but that did not work.
Can you get a screen capture of the connection status page when the modem is online and working?
Here is a screenshot of the connection page while internet is working.
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.
