What are good signal levels

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Resident Expert
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Posts: 6,985

Re: What are good signal levels

@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. 



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I'm a Reliable Contributor
Posts: 381

Re: What are good signal levels

@Datalink

 

I am getting 603/23 on my 500/20 plan so no complaints 🙂

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I've Been Here Awhile
Posts: 2

Re: What are good signal levels

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.

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Retired Moderator
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Posts: 390

Re: What are good signal levels

Hey @bfwaye,

 

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?

 

Capture1.PNGCapture2.PNG

 

 

We look forward to hearing back from you! 

 

Cheers, 

RogersCilio

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Re: What are good signal levels

Thanks for the informative chart.

 

Here are the Upstream Overview

Upstream Overview

Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandWidth
130596000ATDMA - 64QAM46.50046400000
238596000ATDMA - 64QAM48.00063200000
323700000ATDMA - 64QAM46.75056400000

 

Here are the downstream overview.

 

 

Downstream Overview

Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1657000000256QAM-1.1001735.780
2561000000256QAM-1.400236.610
3567000000256QAM-1.500336.387
4573000000256QAM-1.400436.610
5579000000256QAM-1.300536.610
6585000000256QAM-1.200636.387
7591000000256QAM-1.300736.387
8597000000256QAM-1.500835.780
9603000000256QAM-1.500935.780
10609000000256QAM-1.7001035.595
11615000000256QAM-1.8001135.595
12621000000256QAM-2.0001235.595
13633000000256QAM-2.5001335.595
14639000000256QAM-2.1001435.084
15645000000256QAM-1.4001535.084
16651000000256QAM-1.4001634.926
17555000000256QAM-1.300136.610
18663000000256QAM-0.9001835.595
19669000000256QAM-0.9001935.595
20675000000256QAM-0.7002035.084
21681000000256QAM-0.3002134.926
22687000000256QAM-0.4002234.926
23693000000256QAM-0.3002334.346
24699000000256QAM-0.3002434.346
25705000000256QAM-0.3002534.300
26711000000256QAM-0.7002633.800
27717000000256QAM-0.9002733.600
28723000000256QAM-1.2002833.000
29729000000256QAM-1.5002933.000
30735000000256QAM-1.6003032.900
31741000000256QAM-1.9003132.700
32747000000256QAM-2.1003232.600
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I'm a Reliable Contributor
Posts: 384

Re: What are good signal levels

Hi everyone. CODA-4582U user here with 36T5 firmware running in bridge mode. There has been work going on about one block away from my house in what appears to be a node split...where there was a single large green “vault” (Rogers’ term) box, now there’s two side by side. Earlier today, cable (all services) went down for about 10 mins. For now, I’m going to assume that it was due to the node work being done. When it came back, I didn’t notice anything different with internet performance but decided to login to the CODA and check signal levels. The signal strength values themselves across all 32 DOCSIS 3.0 channels didn’t change (remained between +3 to +4). The OFDM signal also remained unchanged at +4. The biggest difference I noticed is that prior to the cable going down, my signal-to-noise values for the 32 DOCSIS channels were between 37 and 38. Now they’re between 33 and 34. There was also a slight change in the 3 upload channel signal values. Prior to today’s outage, upload signal values were 33, 34, and 37. Now they’re 34, 35, and 38. Is there any reason for me to be concerned? As stated, I haven’t noticed any performance difference. I’m on the 500u plan and consistently get 490-530 down and 17-21 up...before and after today’s outage (before and after signal values changed).
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Re: What are good signal levels

@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.  



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Posts: 384

Re: What are good signal levels

Thanks. Will do. What’s interesting is that signal and SNR on my cable boxes (NB3s) have not changed. Just the CODA.
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Re: What are good signal levels

Hello @bfwaye,

 

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!

 

RogersTony

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Posts: 384

Re: What are good signal levels

Tony, 2 of my 3 upstream channels are below the acceptable threshold. Also, my 32 DOCSIS 3.0 channels are mostly above 4db and SNR values are low as I posted above. Prior to my neighbourhood’s node split, the last tech who visited (a while ago) connected my coax cables for all of my residential services to an Antronox multimedia 0db gain / 0db loss amplifier. If I were to remove the amplifier and reconnect my cables to the regular Rogers-certified Antronix splitter (with -3.5db and -7db ports), that would drop signal levels of the 32 channels closer to 0 and likely bump the upstream levels up. Would it also increase my SNR values back to acceptable values (37 to 38)? I’m just wondering if signal coming into my house with the node split is now higher, and thus, the amp isn’t needed anymore? As I mentioned in my earlier post, I’m not really having any issues. TV and home phone are flawless, download speeds are also fairly consistent. My upload speeds are generally ok, but sometimes only about half (i.e. 12Mbps instead of 20) during peak hours at night.