CODA-4582 - Open Issues for Investigation

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I Plan to Stick Around
Posts: 26

Re: CODA-4582 - Open Issues for Investigation

This is what it looks like if I remove the attenuator (which by the way looks like its actually a -8 attenuator, FAM-8):

 

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1657000000256QAM9.0001734.346
2561000000256QAM6.700213.327
3567000000256QAM6.000313.619
4573000000256QAM5.800414.849
5579000000256QAM5.900515.249
6585000000256QAM6.400616.346
7591000000256QAM7.000716.693
8597000000256QAM6.700817.370
9603000000256QAM7.300918.893
10609000000256QAM7.8001018.616
11615000000256QAM8.0001134.926
12621000000256QAM8.6001234.926
13633000000256QAM8.9001334.484
14639000000256QAM9.2001434.346
15645000000256QAM9.2001534.484
16651000000256QAM9.0001634.484
17555000000256QAM7.100119.869
18663000000256QAM9.3001834.926
19669000000256QAM9.5001934.926
20675000000256QAM9.3002034.484
21681000000256QAM9.1002134.346
22687000000256QAM8.9002233.957
23693000000256QAM8.6002333.957
24699000000256QAM8.6002433.834
25705000000256QAM8.2002533.487
26711000000256QAM7.8002633.377
27717000000256QAM7.6002733.063
28723000000256QAM6.6002832.676
29825000000256QAM3.0002929.807
30831000000256QAM3.7003029.759
31837000000256QAM4.4003129.620
32843000000256QAM4.9003229.620
OFDM Downstream Overview
ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
0NANANONONONA
14K290600000YESYESYES6.900002
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth
130596000ATDMA - 64QAM29.50016400000
238595824ATDMA - 64QAM40.75033200000
323700000ATDMA - 64QAM29.00026400000
I Plan to Stick Around
Posts: 30

Re: CODA-4582 - Open Issues for Investigation

I think this bug has not been reported yet?

 

For my LAN, I assigned a subnet mask of 255.255.252.0 in the CODA-4582, however, the CODA-4582 DHCP hands out 255.255.255.0 regardless of what it says in the GUI.

 

The GUI confirms that the subnet mask should be 255.255.252.0 but it is not being passed to my clients.

 

screenshot_129.png

 

screenshot_130.png

 

I have to use the CODA-4582 built in DHCP at the moment as my pfSense router is offline temporary.

I Plan to Stick Around
Posts: 26

Re: CODA-4582 - Open Issues for Investigation

These are the readings I get without the attenuator, which looks to actually be -8. I just called Rogers and they are saying that their bottom spec for SnR is 25. They do have a technician coming out, but I am afraid they won't be able to fix this since they don't seem to be all too eager to even try to find the problem.

 

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1657000000256QAM9.0001734.346
2561000000256QAM6.700213.327
3567000000256QAM6.000313.619
4573000000256QAM5.800414.849
5579000000256QAM5.900515.249
6585000000256QAM6.400616.346
7591000000256QAM7.000716.693
8597000000256QAM6.700817.370
9603000000256QAM7.300918.893
10609000000256QAM7.8001018.616
11615000000256QAM8.0001134.926
12621000000256QAM8.6001234.926
13633000000256QAM8.9001334.484
14639000000256QAM9.2001434.346
15645000000256QAM9.2001534.484
16651000000256QAM9.0001634.484
17555000000256QAM7.100119.869
18663000000256QAM9.3001834.926
19669000000256QAM9.5001934.926
20675000000256QAM9.3002034.484
21681000000256QAM9.1002134.346
22687000000256QAM8.9002233.957
23693000000256QAM8.6002333.957
24699000000256QAM8.6002433.834
25705000000256QAM8.2002533.487
26711000000256QAM7.8002633.377
27717000000256QAM7.6002733.063
28723000000256QAM6.6002832.676
29825000000256QAM3.0002929.807
30831000000256QAM3.7003029.759
31837000000256QAM4.4003129.620
32843000000256QAM4.9003229.620
OFDM Downstream Overview
ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
0NANANONONONA
14K290600000YESYESYES6.900002
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth
130596000ATDMA - 64QAM29.50016400000
238595824ATDMA - 64QAM40.75033200000
323700000ATDMA - 64QAM29.00026400000
Resident Expert
Resident Expert
Posts: 6,460

Re: CODA-4582 - Open Issues for Investigation

@lupinglade if you have time, call back in and ask the CSR to check the DOCSIS 3.0 signal to noise ratios for your neighbours.  That will determine if this is a single line issue (yours) or if its a wider area problem, in which case there should be a different tech assigned, or possibly a maintenance crew.   With the signal attenuator taken out, it pretty evident that you have noise issues that require sorting out.  The question is, are you the only one on your local tap with this issue?  With several channels running in the 15 dB range for signal to noise, there should be no hesitation in sending a tech to determine what the problem is.  The main concern should be to assign the right level of technician to address the issue. 



I Plan to Stick Around
Posts: 26

Re: CODA-4582 - Open Issues for Investigation

@Datalink Talked to Rogers again -- they are saying its in spec and see no reason to run any tests on the neighbourhood. As I expected. Rogers seems to only care if you have no Internet at all, ie. <25 SnR etc. 😞

I Plan to Stick Around
Posts: 154

Re: CODA-4582 - Open Issues for Investigation

@lupinglade well your levels are more than 10x lower than acceptable -- clearly that should be enough for them to fix the problem. Your SNR levels are absolutely terrible, you clearly need a line replaced.

Network Architect
Network Architect
Posts: 611

Re: CODA-4582 - Open Issues for Investigation

Good morning Community,

 

Just a quick note that due to a fat finger problem this morning (100% my fault), I deleted all my private messages.

 

If you sent me something and you are still expecting an answer, reach out to me again.

 

Sorry for that.

 

Dave

I Plan to Stick Around
Posts: 207

Re: CODA-4582 - Open Issues for Investigation


@RogersDave wrote:

Good morning Community,

 

Just a quick note that due to a fat finger problem this morning (100% my fault), I deleted all my private messages.

 

If you sent me something and you are still expecting an answer, reach out to me again.

 

Sorry for that.

 

Dave


You need an assistant, for the usual, but also for some one to blame. Smiley Very Happy

I Plan to Stick Around
Posts: 26

Re: CODA-4582 - Open Issues for Investigation

@Telek so you think rogers sticking an attenuator on the line isnt an acceptable fix? I guess it just masks the symptoms?

Highlighted
I Plan to Stick Around
Posts: 154

Re: CODA-4582 - Open Issues for Investigation

@lupinglade correct. It's strange, but depending on how the noise is created, since SNR is a ratio between signal and noise, if the attenuator filters out noise more than signal, you can get a higher SNR after.

 

But your levels without the attenuator are terrible, so it requires a real fix.