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What are good signal levels

s1lva166
I Plan to Stick Around

Hi everyone!

 

I'm currently on the Hybrid Fibre 150 package and I'm using the Hitron CGN3ROG modem/router. I was wondering what are good downstream and upstream signal ratios? If someone could provide a range that would be great. I'm also wondering what were the best signals you have seen coming from the router? Here is a screen shot of my current signals:

 

Downstream:
http://snag.gy/lVf3P.jpg

 

Upstream:

http://snag.gy/UOm2F.jpg

 

Thanks!

 

 

***edited labels***

186 REPLIES 186

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.  



Re: What are good signal levels

toolcubed
I'm a Senior Contributor
Thanks. Will do. What’s interesting is that signal and SNR on my cable boxes (NB3s) have not changed. Just the CODA.

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

Re: What are good signal levels

toolcubed
I'm a Senior Contributor
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.

Re: What are good signal levels

toolcubed
I'm a Senior Contributor
UPDATE to my post above. I introduced a Rogers-certified 2 way splitter. Line coming into the house going into 2 way splitter. One -3.5db port to CODA, the other -3.5db port into Antronix amp where home phone and 2 TVs are connected. CODA levels are now back to normal. The 32 channels are around 0db, SNR are mostly 37 (some are 38), and the three upload channels are 37, 38, and 41. OFDM signal is a solid 0.3db 🙂 Now I just have to keep an eye on the TVs to make sure there aren’t any issues because signal (when looking at diagnostic menu on NB3 boxes) dropped to -4 to -5 for most channels.

Re: What are good signal levels

mobriladigo
I Plan to Stick Around

@Dragus wrote:

Is my DOCSIS WAN readings bad?

 

I've seen peoples DOCSIC usually -/+5 from 0 in signal strength. Read from another post that signal noise should be between 36-38.

 

I've been checking multiple times a day since May 16 to confirm it's consistent throughout the day.

 

Does bridge mode affect any of these values?

 

Running CGN3ACSMR and I think my download speeds are pretty consistent from when i've been downloading. Occassionally I may experience some redbar lag on my PS4 but can't confirm if it's on my end or on PSN/Destiny side.

 

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1603000000256QAM-13.900335.595
2591000000256QAM-12.900136.610
3597000000256QAM-13.600235.595
4609000000256QAM-13.800435.084
5615000000256QAM-13.600535.595
6621000000256QAM-14.100634.926
7633000000256QAM-14.900734.346
8639000000256QAM-14.500834.484
9645000000256QAM-15.100933.957
10651000000256QAM-15.4001033.957
11657000000256QAM-15.3001133.957
12663000000256QAM-15.6001233.834
13669000000256QAM-16.3008533.063
14675000000256QAM-16.3008632.676
15681000000256QAM-15.7008733.487
16687000000256QAM-15.0008834.346
17693000000256QAM-16.0008933.377
18699000000256QAM-16.9009032.963
19705000000256QAM-15.9009133.487
20711000000256QAM-15.9009233.487
Upstream Overview
Port IDFrequency (MHz)ModulationSignal Strength (dBmV)Channel IDBandWidth
123700000ATDMA - 64QAM44.00036400000
230596000ATDMA - 64QAM44.00026400000
338596000ATDMA - 64QAM44.00013200000

The outside cabling and connectors don't keep going forever and now and then a tech visit is required to supplant them. That is an exceptionally typical event despite the fact that it for the most part takes quite a while until the point when the link break down to a point where it requires consideration.

Re: What are good signal levels

Hitron CODA-4582U Signal Levels

 

Hey guys - I was looking for some help/advice about my Hitron CODA-4582U cable modem. Rogers set it up in the basement, however, I was looking to move it to another part of the house. I was reading about signal levels and was wondering if anyone knew if the following output was considered good/satisfactory/bad. 

 

What am I looking for with the dBmV values for downstream and upstream? What should the Signal Noise Ratio be? Any help is greatly appreciated!

 

Downstream Overview

Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 603000000 256QAM -12 9 35.084
2 849000000 256QAM -16.1 2 33.487
3 855000000 256QAM -15.7 3 33.487
4 861000000 256QAM -16.1 4 33.377
5 579000000 64QAM -11.6 5 4.191
6 585000000 64QAM -11.6 6 4.191
7 591000000 64QAM -11.3 7 4.191
8 597000000 64QAM -11.8 8 4.191
9 603000000 64QAM -6.2 1 4.191
10 609000000 64QAM -11.8 10 4.191
11 615000000 256QAM -12.1 11 35.084
12 621000000 256QAM -12.4 12 35.084
13 633000000 256QAM -11.1 13 35.595
14 639000000 256QAM -10.9 14 35.78
15 645000000 256QAM -10.7 15 35.78
16 651000000 256QAM -10.9 16 35.78
17 657000000 256QAM -11.3 17 35.78
18 663000000 256QAM -11.2 18 35.78
19 669000000 256QAM -11.1 19 35.78
20 675000000 256QAM -11.2 20 35.78
21 681000000 256QAM -11 21 35.595
22 687000000 256QAM -10.8 22 36.387
23 693000000 256QAM -10.9 23 35.78
24 699000000 256QAM -11.3 24 35.595
25 705000000 256QAM -11.5 25 35.78
26 711000000 256QAM -11.9 26 35.78
27 717000000 256QAM -12 27 35.78
28 723000000 256QAM -11.9 28 35.78
29 825000000 256QAM -14.8 29 34.484
30 831000000 256QAM -15.4 30 33.957
31 837000000 256QAM -15.8 31 33.834
32 843000000 256QAM -15.5 32 33.957

 

Upstream Overview

Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 23700000 ATDMA - 64QAM 39.25 5 6400000
2 38596000 ATDMA - 64QAM 45.25 6 3200000
3 30596000 ATDMA - 64QAM 41.5 4 6400000

 

Thank you,

M.

Re: What are good signal levels

Ouch, not good at all.  Are those levels with the modem in the basement, or after you have moved the modem upstairs?  For the downstream, you should see something like the following, all of the way down thru the chart:

 

Port

 ID

Frequency

   (MHz)

Modulation Signal strength (dBmV)

Channel

      ID

Signal noise ratio (dB)
1 XXX000000 256QAM  0 (realistically within a +/- 7 dBmV range)       X         36 to 40

 

Your downstream signal levels are terrible, but, the first question is, where is the modem, in its original install location, or has it been moved?

 

The upstream isn't great either.  The upstream signal level, for this modem, when its running DOCSIS 3.1, should be in the 30 to 33 dBmV range.

 

Can you post the OFDM section of the table as well please.

 

If the modem is still in its original install location, call tech support and ask the CSR to run a signal check on the modem.  That check will fail automatically, at which point the CSR should arrange a tech visit to determine what the problem is.  

 

If you've moved the modem, can you move it back to its original location and post the same table, including the OFDM and OFDMA sections. 

 

Edit:  In terms of the modem location, you are correct, it can be installed anywhere in the home where there is a cable port nearby.  The tech will ensure that the modem signal levels are correct, inbound at the modem and outbound at the neighborhood node.  Usually the modem's cable is connected to the port on a splitter or powered amplifier that provides the least amount of signal drop.  In the case of a two port splitter, it doesn't matter as both ports have the same output.  For three ports or more, up to a point, there should be one port that is marked -3.5 dB, which is the preferred port.  When you get to larger multi-port splitters, the drop is all the same.  At that point the tech will probably cascade splitters to keep the modem signal drop to a minimum.  For power amps, there is one port marked for VOIP use.  That port is not amplified and is used for both VOIP and modem purposes. 



Re: What are good signal levels

Thanks for the info. The cable modem has remained in the basement since the day I got it connected. I wanted to understand if I was getting a decent connection in the basement before exploring other options. I contacted Rogers about this and they ran a test to check the signal levels. They offered to have someone come out to the house to try and correct the issue. What are the acceptable levels for the metrics below? Could this be a result of the cable running to the modem? Or is this a wider issue with the cabling on the property? 

 

I have posted today's data below: 

 

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1603000000256QAM-12.4935.084
2849000000256QAM-16.5233.063
3855000000256QAM-16.3333.377
4861000000256QAM-16.6432.963
557900000064QAM-12.154.191
6585000000256QAM-11.964.243
759100000064QAM-11.774.191
8597000000256QAM-12.384.243
9603000000256QAM-714.243
10609000000256QAM-12104.243
11615000000256QAM-12.51135.084
12621000000256QAM-12.81234.926
13633000000256QAM-11.31335.595
14639000000256QAM-11.31435.78
15645000000256QAM-11.11535.595
16651000000256QAM-11.31635.595
17657000000256QAM-11.71735.78
18663000000256QAM-11.71835.78
19669000000256QAM-11.61935.595
20675000000256QAM-11.82035.595
21681000000256QAM-11.72135.595
22687000000256QAM-11.42235.78
23693000000256QAM-11.52335.595
24699000000256QAM-11.92435.595
25705000000256QAM-12.22535.595
26711000000256QAM-12.62635.595
27717000000256QAM-12.82735.084
28723000000256QAM-12.72835.084
29825000000256QAM-15.52933.834
30831000000256QAM-163033.487
31837000000256QAM-16.23133.377
32843000000256QAM-163233.487
 
OFDM Downstream Overview 
ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
0NANANONONONA
1NANANONONONA

 

Upstream Overview

Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth
123700000ATDMA - 64QAM41.7556400000
238596000ATDMA - 64QAM42.7563200000
330596000ATDMA - 64QAM40.2546400000

 

OFDM/OFDMA Overview

  
Channel IndexStatelin Digital AttDigital AttBW (sc's*fft)Report PowerReport Power1_6FFT Size

Thanks again,

M.

Re: What are good signal levels

For the upper DOCSIS 3.0 channels, the signal level, ideally would be centered around 0 dBmV with a signal to noise ratio in the 36 to 40 dB range.  

 

The OFDM channel should show one channel active.  

 

The upstream signal level should be in the 30 to 33 dBmV range.  

 

Signal levels such as yours are typically the result of external cable and/or connector failures.  The external cable and connectors degrade over the years due to weathering effects, so, every once in a while they require replacement.  This might be nothing more than a connector issue, or, it might require a new external cable.  The tech will determine what is required. 

 

Just to note, the 4582 is a DOCSIS 3.1 modem.  Your modem isn't running DOCSIS 3.1 as seen by the two inactive OFDM channels.  Usually there is one OFDM channel running.  Looking at your signal levels, the DOCSIS 3.0 levels show that there is a problem in the 500 Mhz range.  The OFDM channel typically runs in the 300 to 500 Mhz range on the Rogers network, so, given the fact that the OFDM channel isn't running, the 500 Mhz range DOCSIS 3.0 levels are poor, and your upstream levels are higher than normal, that indicates that there is major signal degradation problem in the lower 500 Mhz range on your inbound cable.  Your cable signal levels are poor overall, but, the lower frequency range is probably worse than what you see in the upper 500 Mhz range. 

 

To make a long story short, you need a tech.  When the tech has completed the required work, you should  see signal levels as indicated above, the OFDM channels should show one OFDM channel active and the modem's front download LED should be a lighter blue in colour, indicating that the modem is using DOCSIS 3.1.  The active OFDM channel should match up with the front LED downstream colour.  Inactive OFDM plus downstream LED the same colour as the upstream LED indicates that the modem is running DOCIS 3.0 on the downstream side.  Active OFDM channel plus light blue downstream LED indicates that the modem is using DOCSIS 3.1 on the downstream side.  

 

When this is all said and done, can you repost the signal levels again.  Sometimes this takes more than one tech visit.  It might in fact be an issue with the local tap, which connects all of your immediate neighbours, or it could be a problem further upstream.  If you're still having issues after the tech has gone, don't hesitate to call tech support again, and at any time.  

 

If you would prefer to move the modem upstairs, and a serviceable cable outlet is available, ask the tech to move the modem.  I don't believe there should be any cost to this as the tech is already onsite for signal problems.  If the cable is an RG-6 cable, and its serviceable, then it should be a matter of connecting that cable to a splitter if you already have additional services.  This only becomes complicated if the cable is already used for another service.  Then its a matter of ensuring that the modem signal level drop that is due to the splitters is minimized.  That's where the tech's creativity and experience enters the picture. 



Re: What are good signal levels

So I went down to the electric closet in the basement and noticed that there is a powered amp connected, but not to the internet line. The power amp was connected to another 3 way splitter that services the tvs upstairs. Temporarily I connected the internet line to powered amp and got the following results. Are these satisfactory, or is there something you see that could improve?

Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 603000000 256QAM 2.600 9 36.387
2 849000000 256QAM -1.700 2 36.610
3 855000000 256QAM -1.500 3 36.610
4 861000000 256QAM -1.800 4 36.387
5 579000000 256QAM 2.700 5 36.610
6 585000000 256QAM 2.900 6 36.610
7 591000000 256QAM 3.100 7 36.610
8 597000000 256QAM 2.600 8 36.610
9 303000000 256QAM 7.900 1 37.356
10 609000000 256QAM 2.600 10 36.610
11 615000000 256QAM 2.300 11 36.610
12 621000000 256QAM 2.100 12 36.610
13 633000000 256QAM 3.400 13 36.610
14 639000000 256QAM 3.400 14 37.356
15 645000000 256QAM 3.700 15 37.356
16 651000000 256QAM 3.400 16 37.356
17 657000000 256QAM 3.100 17 37.356
18 663000000 256QAM 2.800 18 37.356
19 669000000 256QAM 3.000 19 37.356
20 675000000 256QAM 2.700 20 37.356
21 681000000 256QAM 2.900 21 37.356
22 687000000 256QAM 3.300 22 37.636
23 693000000 256QAM 3.100 23 37.636
24 699000000 256QAM 2.800 24 37.356
25 705000000 256QAM 2.300 25 37.636
26 711000000 256QAM 2.100 26 37.636
27 717000000 256QAM 1.700 27 37.636
28 723000000 256QAM 2.100 28 37.636
29 825000000 256QAM -0.500 29 37.636
30 831000000 256QAM -1.200 30 36.610
31 837000000 256QAM -1.400 31 37.356
32 843000000 256QAM -1.200 32 37.356
OFDM Downstream Overview
Receiver FFT type Subcarr 0 Frequency(MHz) PLC locked NCP locked MDC1 locked PLC power(dBmv)
0 NA NA NO NO NO NA
1 4K 275600000 YES YES YES 7.599998
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 23700000 ATDMA - 64QAM 40.750 5 6400000
2 38596000 ATDMA - 64QAM 44.500 6 3200000
3 30596000 ATDMA - 64QAM 40.750 4 6400000
OFDM/OFDMA Overview
Channel Index State lin Digital Att Digital Att BW (sc's*fft) Report Power Report Power1_6 FFT Size
0 DISABLED 0.5000 0.0000 0.0000 -inf -1.0000 4K
1 DISABLED 0.5000 0.0000 0.0000 -inf -1.0000 4K

Re: What are good signal levels

Nope, don't do that.  There are two styles of amps that are in use these days.  The older amps will amplify everything.  They will also cause packet loss.  The newer amps have an internal passive splitter.  One leg goes to the VOIP port.  The other leg goes to the amplifier and then out to the other ports.  The VOIP phone or modem is connected to the passive port to avoid packet loss.  

 

The biggest problem with splitters, personal opinion, is that they hide bad signal conditions and amplify any noise that is in the cable system.  So, I would guess that your cable set top boxes are working and that you may or may not see any problems.  

 

The results for the modem might improve slightly depending on which port the modem cable is connected to.  That splitter probably has one port marked -3.5 db and two ports marked -7 dB.  That indicates the loss on each port, with -3.5 dB being the lowest signal loss.  The cable modem should be connected to that port.  

 

The solution here is to take care of the losses before they arrive at that splitter.  So, the field techs and maintenance crews have to ensure that there is no excessive losses in the system, right up to that splitter.  If the tech can't resolve the low signal conditions, then a maintenance crew should be called in to take care of any upstream losses.  This is where persistence on your part comes in.  If the first or second tech can't get it right, don't hesitate to call tech support again, and again ......   For now, we'll see how the first visit goes. 



Re: What are good signal levels

Thanks so much for the info! I have a Rogers tech coming out to my place this Sunday. Will post an update once they're done. Hopefully this is something they can resolve easily, and during the first visit. 

Re: What are good signal levels

I noticed a error in my previous response.  

 

Where it reads: "The biggest problem with splitters"

 

Should read:  The biggest problem with amplifiers, personal opinion, is that they hide bad signal conditions and amplify any noise that is in the cable system.

 

My apologies for the confusion.  The amplifier hides those issues, which is why you probably don't see any problems with the set top boxes.  The modem however, running thru the splitter is subject to the low signal levels and poor signal to noise ratios.  That's a direct result of the cable and/or connector issues. 

 

The only time that you will probably see an amplifier ahead of a modem is if you happen to be the last customer(s) on the cable run from the local node.  That cable run can result in less than stellar signal levels.  The only way to resolve that would be to increase the initial signal levels, which poses problems for customers who are much closer to the node.  So, the initial output signal levels are a happy medium so to speak, to service customers along the entire cable run.  



Re: What are good signal levels

Hi guys,

 

Just to follow up on my previous post, the Rogers tech came out to my place this past weekend and did the following:

 

1. He removed a splitter from the distribution box in my front lawn

2. He removed the powered amplifier in my basement

3. He connected the cable line coming in from outside directly to the cable modem line using a double sided female adapter (I don't have any Rogers TV service so this was possible). 

4. He ran a bunch of signal tests on all the connections points in the house and found that the best option (other than the basement) was on the top floor.

5. He moved the cable modem up and checked connectivity. 

 

I got the following results. Let me know what you guys think! Thank you! 

 

Downstream Overview  
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)  
1597000000256QAM-2.4836.61  
2849000000256QAM-4.4237.356  
3855000000256QAM-4337.356  
4861000000256QAM-4.4436.61  
557900000064QAM-1.754.191  
658500000064QAM-1.564.191  
7591000000256QAM-1.6736.387  
859700000064QAM1.914.191  
960300000064QAM-2.294.191  
1060900000064QAM-2.1104.191  
11615000000256QAM-2.21136.387  
12621000000256QAM-2.21236.61  
13633000000256QAM-2.41336.387  
14639000000256QAM-2.41436.61  
15645000000256QAM-1.91536.61  
16651000000256QAM-1.71637.356  
17657000000256QAM-1.71736.61  
18663000000256QAM-11837.356  
19669000000256QAM-0.71937.636  
20675000000256QAM-1.22037.356  
21681000000256QAM-0.82137.636  
22687000000256QAM-12237.636  
23693000000256QAM-12337.636  
24699000000256QAM-1.22437.356  
25705000000256QAM-1.22537.356  
26711000000256QAM-1.22637.356  
27717000000256QAM-1.22737.636  
28723000000256QAM-1.22837.636  
29825000000256QAM-3.62937.636  
30831000000256QAM-43037.356  
31837000000256QAM-4.53137.356  
32843000000256QAM-4.23237.356  
        

 

 

OFDM Downstream Overview

ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
0NANANONONONA
1NANANONONO

NA

 
 

Upstream Overview

Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth 
138596000ATDMA - 64QAM3963200000 
230596000ATDMA - 64QAM35.7546400000 
323700000ATDMA - 64QAM33.2556400000 

 

OFDM/OFDMA Overview

Channel IndexStatelin Digital AttDigital AttBW (sc's*fft)Report PowerReport Power1_6FFT Size
        

Re: What are good signal levels

Ugh!! That is terrible.  All of the DOCSIS 3.0 channels with 4.191 as a Signal to Noise ratio, shouldn't be that way.  Note that those levels are all in the 500/600 Mhz range.  If you look carefully at the channel frequencies, you can see those channels sitting very close to channels that are acceptable, so, something's up, so to speak.  Your DOCSIS 3.1 OFDM channel isn't running, indicating that the channel won't support DOCSIS 3.1 operation.  That channel starts around 300 Mhz and runs up to approx 492 Mhz.  So it looks like you have problems in the lower 500 Mhz range with that particular cable run.  If that's the best of the bunch, you have problems.  

 

The DOCSIS 3.0 upstream levels are higher than normal as well for that modem.  Typically their down around 30 to 32/33 dBmV.  So you have a couple channels which are slightly higher, with a larger spread (33 to 39 dBmV) than is normal. 

 

So at the present time, you don't have DOCSIS 3.1 downstream running which is designed to deliver higher data rates, and you're effectively running with a reduced set of DOCSIS 3.0 channels for downstream operation.  The upstream levels shouldn't be an issue.  

 

So, the question of the day, would you happen to know if your house cabling is RG-59 or RG-6?  If you look in the basement, where those cables converge, you should be able to read the cable type which is imprinted on the cable jacket.  Ideally that should be RG-6.  RG-59 has higher losses in the higher frequency range.  

 

I'd be interested in seeing the signal levels with the modem connected to the incoming cable in the basement.  That would answer the question of whether or not the signal levels are bad due to house wiring or if they're already in poor condition before they arrive in the basement.

 

Is all of the house cabling internal to the house?  Are there any cables that exit the home, and then re-enter the home at other locations?  If there were any cable runs on the outside of the house, then those cables would be subject to weathering over the years and might need replacement.



Re: What are good signal levels

Ah man, just when I thought they were good! :S

 

The house itself is about 35-40 years old so I'm assuming the cables running through the house are around the same. The cable running into the basement from outside looks pretty old. It's discolored and a beige in color. I'll check the rating on the cable if it hasn't already worn out. I've got no cables running outside the house. They come into the house and then move from within to the rooms upstairs. 

 

I'll try plugging in the modem directly to the feed that comes from outside. Once done I'll post the results. 

 

What do I look for to make sure the modem is running in DOCSIS 3.1? Is there something in particular that should show up?

 

Thanks for the info!  

Re: What are good signal levels

toolcubed
I'm a Senior Contributor

The million dollar question is why did the tech leave without checking the modem stats? I assume it wasn’t a senior tech. Rogers REALLY needs to reconsider their processes when it comes to these techs. Rogers ends up wasting a lot of money and time by having to schedule repeat visits.

Re: What are good signal levels

He used his laptop to run a couple of tests. The metrics he was looking at had TX and RX stats but nothing similar to what I see when I log into the modem. I pulled up the modem stats, showed them to him, but it didn't seem like he was too interested (there was also a significant language barrier between the two of us). When I saw the downstream signal levels closer to 0 (+/- 7 DBmV) I assumed it was fixed. 

 

With the levels that they are at right now, will Rogers be able to send another tech over? 

 

@CommunityHelps Is there anything you guys can do to get this fixed? The experts in here believe I still have a major issue.

 

Thank you to everyone for your help!

Re: What are good signal levels

When the modem is running DOCSIS 3.1 on the downstream side, the front downstream LED will be a lighter blue in colour, its supposed to be magenta.  In the signal level table, that light blue LED should be accompanied with one OFDM channel showing as active.  There is only one OFDM downstream channel in operation at the present time.  Upstream DOCSIS 3.1 as shown in the bottom OFDM/OFDMA section isn't in operation yet.  Rogers is still testing Upstream 3.1, as is all of the other ISPs who happen to be using DOCSIS 3.1.  Techs from ISPs will staple cabling around the edge of rooms, but won't fish cables thru walls and floors. 

 

I suspect that your cables will be RG-59, given how old the house is.  You'll know soon enough.  If thats the case, you should consider calling in an electrician or company that does internal cable replacement and pull RG-6 cables where its possible.  No ISP will do that, so its really up to the home owner to install or replace cables that are beyond the demarcation point. 

 

You'll also know what the situation is when you're able to connect the modem to the incoming cable in the basement.  

 

Just as a note, I'm surprised that the tech didn't say anything to you about the DOCSIS 3.1 channel.  It would be interesting to see what the test equipment indicated, but, I have a hard time believing that it was ok on the test equipment, given that the modem won't run the OFDM channel. The two results should be comparable, otherwise, what the point of the test equipment? 



Re: What are good signal levels

RyzenFX
I'm a Reliable Contributor

@m9hrdad wrote:

Hi guys,

 

Just to follow up on my previous post, the Rogers tech came out to my place this past weekend and did the following:

 

1. He removed a splitter from the distribution box in my front lawn

2. He removed the powered amplifier in my basement

3. He connected the cable line coming in from outside directly to the cable modem line using a double sided female adapter (I don't have any Rogers TV service so this was possible). 

4. He ran a bunch of signal tests on all the connections points in the house and found that the best option (other than the basement) was on the top floor.

5. He moved the cable modem up and checked connectivity. 

 

I got the following results. Let me know what you guys think! Thank you! 

 

Downstream Overview  
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)  
1597000000256QAM-2.4836.61  
2849000000256QAM-4.4237.356  
3855000000256QAM-4337.356  
4861000000256QAM-4.4436.61  
557900000064QAM-1.754.191  
658500000064QAM-1.564.191  
7591000000256QAM-1.6736.387  
859700000064QAM1.914.191  
960300000064QAM-2.294.191  
1060900000064QAM-2.1104.191  
11615000000256QAM-2.21136.387  
12621000000256QAM-2.21236.61  
13633000000256QAM-2.41336.387  
14639000000256QAM-2.41436.61  
15645000000256QAM-1.91536.61  
16651000000256QAM-1.71637.356  
17657000000256QAM-1.71736.61  
18663000000256QAM-11837.356  
19669000000256QAM-0.71937.636  
20675000000256QAM-1.22037.356  
21681000000256QAM-0.82137.636  
22687000000256QAM-12237.636  
23693000000256QAM-12337.636  
24699000000256QAM-1.22437.356  
25705000000256QAM-1.22537.356  
26711000000256QAM-1.22637.356  
27717000000256QAM-1.22737.636  
28723000000256QAM-1.22837.636  
29825000000256QAM-3.62937.636  
30831000000256QAM-43037.356  
31837000000256QAM-4.53137.356  
32843000000256QAM-4.23237.356  
        

 

 

OFDM Downstream Overview

ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
0NANANONONONA
1NANANONONO

NA

 
 

Upstream Overview

Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth 
138596000ATDMA - 64QAM3963200000 
230596000ATDMA - 64QAM35.7546400000 
323700000ATDMA - 64QAM33.2556400000 

 

OFDM/OFDMA Overview

Channel IndexStatelin Digital AttDigital AttBW (sc's*fft)Report PowerReport Power1_6FFT Size
        

@Datalink

 

For reference, the SNR of 4.191 is a interface bug. This happened to me quite a few times, but a reboot fixes it. 

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