What are good signal levels

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I'm Here A Lot
Posts: 7

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
        
Resident Expert
Resident Expert
Posts: 5,808

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.



I'm Here A Lot
Posts: 7

Re: What are good signal levels

Ah man, just when I thought they were good! Smiley Frustrated

 

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!  

I'm a Regular
Posts: 295

Re: What are good signal levels

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.

I'm Here A Lot
Posts: 7

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!

Resident Expert
Resident Expert
Posts: 5,808

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? 



I'm a Reliable Contributor
Posts: 564

Re: What are good signal levels


@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. 

Resident Expert
Resident Expert
Posts: 5,808

Re: What are good signal levels

Ok, learn something new all the time.  But, that doesn't change the problem that the OFDM channel isn't running.  There's still an issue with signal levels, noise or both in the lower 500 Mhz band. 



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