@Alex4161 they don't look too bad. The upper DOCSIS 3.0 signal levels have a larger high to low value spread than I would like to see, but, I wouldn't expect any issues with where they currently are. The signal no noise ratios are fine. The upstream levels aren't too bad either. All of those values are well within spec.
If you run an ethernet speedtest at www.speedtest.net Toronto, Ottawa or Montreal Rogers servers, what do you get for results? Use the closest one to your home.
My modem CGNM-3552 always shows two green connection lights flashing on & off - not solid. The modem's DOCSIS WAN tab always shows a minus quantity for the downstream signal strength (dBmV). Would this be normal for this modem? I am connected via Ethernet cable.
Welcome to our Rogers Community Forum and good question!
I can certainly understand your concern, especially since typically, connection lights flashing indicate the modem is intermittently dropping connection. However, that doesn't necessarily mean it's the case here. I've provided a chart below for you own reference. Let us know what you're seeing your end?
As for your signal, minus quantity doesn't always reflect an issue. There's a range your downstream signal should be in between, for it to be working at it's optimum. @RogersMoin touches on this on page 1 of this thread. Have a look and let us know how your signal is in comparison?
We look forward to hearing back from you!
Thanks for the informative chart.
Here are the Upstream Overview
|Port ID||Frequency (MHz)||Modulation||Signal strength (dBmV)||Channel ID||BandWidth|
|1||30596000||ATDMA - 64QAM||46.500||4||6400000|
|2||38596000||ATDMA - 64QAM||48.000||6||3200000|
|3||23700000||ATDMA - 64QAM||46.750||5||6400000|
Here are the downstream overview.
|Port ID||Frequency (MHz)||Modulation||Signal strength (dBmV)||Channel ID||Signal noise ratio (dB)|
@toolcubed you're DOCSIS 3.0 signal to noise ratios are a little low. Ideally they would range from 36 to 40 dB. The modem should be running DOCSIS 3.1 so those values should be a moot point, however, I've seen my modem kick over to DOCSIS 3.0 mode recently so those DOCSIS 3.0 channels do come into play and if and when that happens, then those signal to noise ratios will be more important.
I'd keep an eye on them over the next few days to see if they settle out at a higher range, and if not, call tech support and have a discussion with the Customer Service Rep. Since nothing has changed at your end, this is as a result of the work at the local node.
Thanks for posting your signal levels!
The signal levels are well within the specified ranges, the minus values you see for the Downstream channels are totally fine.
The acceptable signal range for the Downstream channels is -10 to 10 but you really want to be closer to -7 to 7 to account for signal loss due to poor weather or other external factors. Closest to 0 is the ideal signal strength for the Downstream channels.
For the Upstream channels, the acceptable range is between 36 to 51. You are getting a bit close to that threshold on the Upstream channels but you are still within specification.
Are you noticing any specific issues with your service that we can troubleshoot?
We look forward to your response!