Have you had a tech out to check thing?
If you are able to log into the modem, and post what the signal levels are, we can point you if that is the issue.
Other side of it, are you in an apartment or townhouse?
And are all of these connected wirelessly?
Just wondering if there is a case of interfearance.
@MorbidDesire, I haven't forgotten about you. Just to gather some info, can you:
1. Let us know what modem you have as seen by the product sticker at the back of the modem. It should be some variation of the CGN3xxxxx, or you might have the CGNM-3552 gigabit modem.
2. Log into the modem and let us know what Software version (Firmware) is currently loaded as seen on the STATUS page that comes up when you log in.
3. Navigate to the STATUS .... DOCSIS WAN page, copy the downstream and upstream tables and paste them into a post. The copy and paste process will paste in the text components of the tables, so you don't have to post a screen capture somewhere. Copy just the tables, nothing above the Downstream table.
@MorbidDesire, your downstream signal levels aren't terribly bad and your signal to noise ratios are good. The upstream is a problem. Yours are very near the failure point. For some reason, you only have two channel ID's listed although the first channel has a power level indicated. So, there is some issue on the go, most likely a cable and/or connector issue.
The external RG-6 cabling to the local tap or to a utility pole doesn't last forever, and every once in a while it has to be replaced. Same for the connectors on the cable. As those cables and connectors age, you end up with more signal loss thru the cable. So, the downstream levels drop and the modem pushes up the upstream output power to compensate for the signal losses on the path back to the CMTS.
The Docsis 3 upper power limit for 3 or 4 channel operation is 51 dBmV. Rogers uses 52 dBmV. That is the highest output level for the modem before the modem drops one channel in order to have enough power transmitting on the remaining two channels, thereby maintaining communications with the CMTS. If more power is required it drops another channel and runs on a single channel. In each case, your downstream and upstream data rates will suffer with each channel loss.
So, at this point have a look at your signal levels and if you see the same condition, where there are only one or two upstream channels with channels IDs, call tech support, indicate to the CSR that you only have one or two upstream channels running and ask him or her to run a signal check on the modem. With only one or two channels running that check will automatically fail, which should then lead to a tech visit fairly soon to resolve the issue.
When that is done, can you repost the signal levels so we can see how they turned out.
