CODA-4582 MoCA 2.0 setup

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I Plan to Stick Around
Posts: 35

Re: CODA-4582 MoCA 2.0 setup

@Datalink 

 

This is the info. with the exact setup, except this time I used a holland 3-way moca splitter GHS-3BPRO-M.

 

Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 639000000 256QAM -7.300 14 34.484
2 591000000 256QAM -8.900 7 33.487
3 597000000 256QAM -8.400 8 33.957
4 849000000 256QAM -11.100 2 32.963
5 855000000 256QAM -10.900 3 32.963
6 861000000 256QAM -12.500 4 31.404
7 579000000 256QAM -6.700 5 35.595
8 585000000 256QAM -8.200 6 34.346
9 603000000 256QAM -7.400 9 34.484
10 609000000 256QAM -8.200 10 33.957
11 615000000 256QAM -7.600 11 34.346
12 621000000 256QAM -6.900 12 34.926
13 633000000 256QAM -6.900 13 35.084
14 279000000 256QAM -3.800 1 35.595
15 645000000 256QAM -6.600 15 35.780
16 651000000 256QAM -6.700 16 35.595
17 657000000 256QAM -8.800 17 33.957
18 663000000 256QAM -7.700 18 34.926
19 669000000 256QAM -6.900 19 35.084
20 675000000 256QAM -8.300 20 34.484
21 681000000 256QAM -8.700 21 33.957
22 687000000 256QAM -8.200 22 34.346
23 693000000 256QAM -7.700 23 34.926
24 699000000 256QAM -8.200 24 34.484
25 705000000 256QAM -8.600 25 34.346
26 711000000 256QAM -8.600 26 33.957
27 717000000 256QAM -8.900 27 34.346
28 723000000 256QAM -10.100 28 33.063
29 825000000 256QAM -11.900 29 32.237
30 831000000 256QAM -10.000 30 33.834
31 837000000 256QAM -9.600 31 34.346
32 843000000 256QAM -11.300 32 32.963
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 -5.200001
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 23700000 ATDMA - 64QAM 35.500 2 6400000
2 38596000 ATDMA - 64QAM 41.500 3 3200000
3 30596000 ATDMA - 64QAM 36.250 1 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
I Plan to Stick Around
Posts: 35

Re: CODA-4582 MoCA 2.0 setup

@Datalink 

 

Here is the one with exact same setup moca splitter but with TWO filter.

Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 651000000 256QAM -6.700 16 35.595
2 591000000 256QAM -8.700 7 33.834
3 597000000 256QAM -8.300 8 33.834
4 849000000 256QAM -12.800 2 31.616
5 855000000 256QAM -11.600 3 32.585
6 861000000 256QAM -11.400 4 32.237
7 579000000 256QAM -6.700 5 35.595
8 585000000 256QAM -8.000 6 34.346
9 603000000 256QAM -7.500 9 34.484
10 609000000 256QAM -8.500 10 33.957
11 615000000 256QAM -7.900 11 34.346
12 621000000 256QAM -7.100 12 34.926
13 633000000 256QAM -7.100 13 34.926
14 639000000 256QAM -7.500 14 34.484
15 645000000 256QAM -6.800 15 35.595
16 279000000 256QAM -3.900 1 35.595
17 657000000 256QAM -8.900 17 33.834
18 663000000 256QAM -7.900 18 34.484
19 669000000 256QAM -7.100 19 35.084
20 675000000 256QAM -8.300 20 34.484
21 681000000 256QAM -8.700 21 34.346
22 687000000 256QAM -8.300 22 34.484
23 693000000 256QAM -7.800 23 35.084
24 699000000 256QAM -8.100 24 34.926
25 705000000 256QAM -8.900 25 34.346
26 711000000 256QAM -8.900 26 33.834
27 717000000 256QAM -9.800 27 33.487
28 723000000 256QAM -10.600 28 32.963
29 825000000 256QAM -12.500 29 31.915
30 831000000 256QAM -10.400 30 33.834
31 837000000 256QAM -10.300 31 33.834
32 843000000 256QAM -12.600 32 31.994
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 -5.200001
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 23700000 ATDMA - 64QAM 35.500 2 6400000
2 38596000 ATDMA - 64QAM 41.500 3 3200000
3 30596000 ATDMA - 64QAM 37.500 1 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
Highlighted
Resident Expert
Resident Expert
Posts: 6,140

Re: CODA-4582 MoCA 2.0 setup

That's with the modem at its normal location?  Not happy with those results at all 😞

 

Edit:  One item to note, you have to be careful with those cables.  Then have a minimum bend radius that should not be exceeded, that is to say, don't bend them at extreme angles.  They should be allowed to turn in another direction with a minimal bend, if thats possible.  Also consider the upstairs electrical boxes.  Those cable clamps at the back of the box should only clamp down on the cables with a minimal amount of force.  If those clamps are too tight, they could damage the cable.

 

At this point I'd install the adapters if you have them on hand, just to see how this will turn out.  If you don't have them yet, consider buying an ethernet/cable tester and go hunting to determine where those upstairs room cables start and terminate and look for any buried splitter.  Worst case scenario is that there's an old splitter buried in a wall somewhere that is now inaccessible. 

 

Did you order the MoCA amp?



I Plan to Stick Around
Posts: 35

Re: CODA-4582 MoCA 2.0 setup

@Datalink 

 

Okay, so the result is bad?

 

What about the one with Antronix splitter? If that one is better, I might just switch back to that one.

It should be this one.

 

And also, the modem is currently located at the main floor, I pull out the wall plate and check the cable, it is WHITE at least, but there is no writing at all.

 

Also the "tan color" cable in the picture setup I sent, do I even need to connect it?  I am not even sure what it does.

 

And Yes, I did order a Antronix MoCA optimized Residential amp which is MVRAM902B and PPC Entry Series PPC-9M-U/U 9-Port Active Return Coax Cable Signal Amplifier Booster Splitter, not arrived tho.

 

===============================================================================

Below is the result with One Antronix 3-way splitter with Two poe filter installed.

Is this result better?

 

Or did I set up the 3-way splitter wrong? The current setup is, two RG-6 cable (probably one of them is for my modem on the main floor) connected to the -7db OUT

and the "tan color" cable connected to the -3.5dB OUT (although I am not even sure do I really need to connect it)

===============================================================================

Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 591000000 256QAM -5.900 7 36.387
2 597000000 256QAM -5.700 8 37.356
3 603000000 256QAM -4.800 9 37.356
4 855000000 256QAM -9.200 3 35.595
5 861000000 256QAM -9.500 4 34.484
6 579000000 256QAM -4.800 5 37.356
7 585000000 256QAM -5.700 6 37.356
8 849000000 256QAM -10.000 2 34.926
9 609000000 256QAM -5.600 10 37.356
10 615000000 256QAM -5.400 11 37.356
11 621000000 256QAM -5.000 12 37.636
12 633000000 256QAM -4.800 13 37.356
13 639000000 256QAM -4.800 14 37.636
14 645000000 256QAM -4.500 15 37.636
15 651000000 256QAM -4.200 16 37.356
16 657000000 256QAM -6.000 17 36.610
17 663000000 256QAM -5.600 18 37.356
18 669000000 256QAM -4.400 19 37.356
19 675000000 256QAM -5.200 20 37.636
20 681000000 256QAM -6.100 21 37.636
21 687000000 256QAM -5.800 22 37.356
22 693000000 256QAM -5.800 23 37.356
23 699000000 256QAM -6.000 24 37.356
24 705000000 256QAM -6.600 25 36.610
25 711000000 256QAM -6.800 26 36.610
26 717000000 256QAM -6.700 27 36.610
27 723000000 256QAM -7.200 28 36.387
28 825000000 256QAM -9.600 29 34.926
29 831000000 256QAM -7.900 30 36.387
30 837000000 256QAM -7.600 31 36.610
31 843000000 256QAM -9.500 32 35.595
32 279000000 256QAM -1.900 1 37.636
OFDM Downstream Overview
Receiver FFT type Subcarr 0 Frequency(MHz) PLC locked NCP locked MDC1 locked PLC power(dBmv)
0 4K 275600000 YES YES YES -3.299999
1 NA NA NO NO NO NA
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 30596000 ATDMA - 64QAM 34.000 1 6400000
2 38596000 ATDMA - 64QAM 39.500 3 3200000
3 23700000 ATDMA - 64QAM 33.750 2 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
Resident Expert
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Posts: 6,140

Re: CODA-4582 MoCA 2.0 setup

@alan4160 ok, looking at the Antronix results, those are providing the best results.  The best result was seen here with a single POE filter connected but even these are poor:

 

https://communityforums.rogers.com/t5/Internet/Rogers-Gaming-amp-Streaming-Lab/m-p/448021#M57315

 

Looking back and forth between the signal levels with the modem connected to the incoming cable, and then with the splitter and modem cable connected, one has to come to the conclusion that there's something drastically wrong with the modem cable (that runs upstairs),  or its connectors at either, or both ends.    My guess is that either the cable has a nail thru it at some point, or, the centre copper core that extends out of the modem cable might be just short enough that its not making contact internally with the splitter port.  That might explain the drop.  Ideally that copper core would be at or extend past the end of the connector by about 1/8 of an inch.  That should ensure that the copper conductor is firmly connected to the splitter.  Both Antronix and Holland splitters should be equal in performance so you should see the same signal levels and signal to noise ratios.  

 

Ideally, those downstream DOCSIS 3.0 channels (1 to 32) would have the following levels:

 

1.  QAM - 256

2. Signal level:  0 dBmV ideally, but within a range of about +/- 6 dBmV.  If the values are outside of that range we usually start to see issues with the internet service.  The limits are +/- 15 dBmV.

3.  Signal to Noise Ratio:  between 36 to 40 dBmV

 

Having said that, your modem is running DOCSIS 3.1 on the downstream side, so all of those upper QAM channels aren't being used unless the OFDM channel is running so poorly that the modem switches over to those DOCSIS 3.0 channels.  That OFDM channel starts at 275.6 Mhz as can be seen in the OFDM channel data.  There isn't enough data presented to determine the health of that channel, so a call to tech support is necessary to ask the Customer Service Rep to run a signal check after which you have to ask specifically if the OFDM channel data is within spec.  At that point the CSR has to find the data, be patient.  So, the OFDM channel starts at 275.6 Mhz and runs upwards 192 Mhz, ending at 467.6 Mhz. 

 

So although the modem is running a DOCSIS 3.1 OFDM channel, the upper QAM channels that surround that channel are of interest as they will indicate, to some degree, what the overall signal levels might be within that OFDM channel.  Ideally, those upper DOCSIS 3.0 channels at 279 Mhz and the next highest channel at 579 Mhz would be running at 0 dBmV.  Your latest post shows the 279 Mhz channel at -1.9 dBmV and the 579 Mhz channel at -4.8.  Not ideal, but, a low downwards slope that is livable for DOCSIS 3.1.  There's no guarantee that the signal levels might not swing wildly within that 192 Mhz band so the surrounding DOCSIS 3.0 channels are just a rough gauge of the OFDM channel health.  To check the OFDM channel properly would require a field tech with the proper test equipment. 

 

Your upstream signal levels are DOCSIS 3.0 channels and are within spec.  They usually run a little lower, but, since this is running off of the -7 dB port, the numbers make sense.  

 

Ok, the question at this point is how many cable devices are you currently running?  Two or three.  You indicated that you didn't know what the tan cable was for, so, my response to that is to disconnect it, unless you absolutely know that its connected to a cable device of some type.  If it turns out that you don't need that cable at all, you can simply use a splitter that has two ports in it instead of three.  If you ran those two white RG-6 cables off of a two port splitter, that splitter would have signal drops of -3.5 dB for each port instead of the -7 dB ports that they are connected to now.  For the time being, if you don't need the tan cable for anything, disconnect it and move the modem's RG-6 cable over to that port.  That will raise the downstream DOCSIS 3.0 and 3.1 signal levels by 3.5 dB and lower the upstream DOCSIS 3.0 levels by 3.5 dB.  I don't think that will cause any issues.  I was under the initial impression that the tan cable fed the modem's wallplate upstairs, but, from your statements above, apparently not.  I apologize for wasting your time with that tan cable, based on my earlier impression it was part of the modem's cabling.  

 

So, the remaining question at this point is why do you see such a drop in signal levels with the splitter installed.  The signal level drops are far beyond what is expected with any splitter,  so the splitter results  so far don't make any sense.  When you have time;

 

1.  Please have a careful look at the end of the modem's RG-6 cable at both ends and see how much of the copper center conductor projects past the end of the connector barrel.  Maybe the basement connector (copper conductor) is just short enough to cause problems by not connecting internally with the splitters.  Please let me know what you find.  If you disconnect one of the white RG-6 cables, the modem's loss of signal, or no loss of signal will tell you which cable is which.  It's probably a good idea to mark the cable so that you know which cable goes where.

 

2.  Please to the same check for the short RG-6 cable that runs from the wallplate to the modem.  If there's enough RG-6 in the wall that you can pull it out of the wall, consider connecting the modem to that cable, bypassing the wallplate's RG-6 connector and the short RG-6 cable that runs from the wallplate to the modem.  You can check the signal levels on the modem to see if they match the signal levels observed when the modem was connected directly to the main cable downstairs.  The signal levels should match. 

 

3.  Check each cable connector to ensure that none of the aluminum cable shield is contacting the copper centre conductor.  That cable shield is usually wrapped back along the cable where it connects to the external shell of the connector when the compression connector is installed.  

 

4.  If you happen to have a multimeter handy, run a continuity check on the modem cable with both ends of the modem cable disconnected.  With the positive lead on the center conductor and the ground lead on the external connector, that should result in an open circuit result.  If its anything much less than open circuit, as in there is a real resistance value observed, then:

 

a.   the cable either has a nail thru it somewhere along the cable;

b.  the cable is bent too sharply at some point resulting in an internal short between the centre copper conductor and the cable shield;

c.  if the cable runs up thru an electrical box, perhaps the rear box clamp was tightened too much, squeezing the cable, which created an internal short;

d.  the cable's aluminum shield material is contacting the center copper conductor.  

 

If you took an F-81 connector, and connected the incoming main cable to the modem cable, and checked the signal levels upstairs, you should see no loss.  The results with the cabling in that configuration should be the same as the results when the modem is connected directly to the main cable.  If there's a big difference, then there's an issue with the modem cable and/or its connectors.  

 

At some point, all this checking will turn up something, just a matter of elimination, step by step. 

 

Are you planning on using the other white RG-6 cable as the second leg of the MoCA network?



Resident Expert
Resident Expert
Posts: 6,140

Re: CODA-4582 MoCA 2.0 setup

@alan4160 here's another item to check, and that is the possibility that the modem cable isn't at fault.  Perhaps the issue is with one of the other cables that are connected to the splitter.  So, this is pretty easy.  Simply disconnect the other cables that are connected to the output ports of the splitter, leaving the modem cable connected.   Then check the signal levels at the modem, where its located upstairs.   If there's no change, as in the DOCSIS 3.0 (1 to 32) signal levels are still below 0 dBmV, shown in your last post, then the problem is probably with the modem cable.  

 

If the signal levels come up above 0, then there is a problem with one of those other cables.  It would have to be some type of short circuit, which is affecting the whole cable system when the problem cable is connected to the splitter.  If this is the case, that still doesn't clear the modem cable of any culpability here.  That would depend on the signal levels that are seen with just the modem cable connected.  

 

My thinking last night was that perhaps the modem cable itself was entirely at fault, so I didn't consider the possibility of the problem originating from one of the other cables.  Sometimes you can't see the forest for the trees, as they say. 

 

One other check to consider is to connect the modem to the other RG-6 cable, wherever that is located upstairs and have a look at the signal levels, just to see what sort of shape that cable might be in.  Both of those cables shouldn't be bad, but, you never know. 



I Plan to Stick Around
Posts: 35

Re: CODA-4582 MoCA 2.0 setup

@Datalink 

 

Today, I unplugged the "tan color" cable and switch to a Antronix 2-way splitter (which comes with modem CMC2002H-A with both -3.5dB output), it brings my attention that, I guess the wiring of this house is pretty old.

 

After disconnect the "tan color" cable, I LOST internet access at my regular modem location (coaxial port), even though I did pull out wall plate and check the cable is white. 

 

So, my guess is all of the wiring above the basement (main floor+second floor) are the "tan color" cables. (Still waiting for the tester to arrive)

 

Oh, I forgot to mention, I have two coaxial outlet at the basement, I believe that is those white RG-6 cables for.

Hence, I might facing the fact that, old wires except at the basement.

I will post the info. see if the connection is better.

===============================================================================

Mainline to a Antronix 2-way splitter without any POE filter. (Coaxial Port# 1)

 

Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 591000000 256QAM 0.200 7 40.366
2 597000000 256QAM 0.000 8 40.366
3 603000000 256QAM 0.100 9 40.366
4 855000000 256QAM -2.600 3 38.605
5 861000000 256QAM -3.500 4 37.636
6 579000000 256QAM 0.700 5 40.366
7 585000000 256QAM 0.300 6 40.366
8 849000000 256QAM -1.900 2 38.983
9 609000000 256QAM 0.400 10 40.946
10 615000000 256QAM 0.900 11 40.946
11 621000000 256QAM 1.200 12 40.946
12 633000000 256QAM 1.600 13 40.366
13 639000000 256QAM 1.400 14 40.946
14 645000000 256QAM 1.200 15 40.946
15 651000000 256QAM 0.800 16 40.366
16 657000000 256QAM 0.700 17 40.946
17 663000000 256QAM 0.600 18 40.366
18 669000000 256QAM 0.500 19 40.946
19 675000000 256QAM 0.500 20 40.946
20 681000000 256QAM 0.300 21 40.946
21 687000000 256QAM 0.100 22 40.946
22 693000000 256QAM 0.100 23 40.946
23 699000000 256QAM 0.100 24 40.366
24 705000000 256QAM 0.000 25 40.366
25 711000000 256QAM -0.100 26 40.366
26 717000000 256QAM -0.600 27 38.983
27 723000000 256QAM -1.600 28 38.983
28 825000000 256QAM -1.800 29 38.983
29 831000000 256QAM -1.800 30 38.983
30 837000000 256QAM -1.500 31 40.366
31 843000000 256QAM -1.600 32 38.983
32 279000000 256QAM 2.300 1 40.366
OFDM Downstream Overview
Receiver FFT type Subcarr 0 Frequency(MHz) PLC locked NCP locked MDC1 locked PLC power(dBmv)
0 4K 275600000 YES YES YES 1.500000
1 NA NA NO NO NO NA
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 30596000 ATDMA - 64QAM 31.500 1 6400000
2 38596000 ATDMA - 64QAM 35.500 3 3200000
3 23700000 ATDMA - 64QAM 29.750 2 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

 

===============================================================================

Mainline to a Antronix 2-way splitter without any POE filter. (Coaxial Port# 2)

Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 591000000 256QAM 3.200 7 40.946
2 597000000 256QAM 2.900 8 40.366
3 603000000 256QAM 3.400 9 40.946
4 855000000 256QAM 0.500 3 38.605
5 861000000 256QAM 0.000 4 38.605
6 579000000 256QAM 3.000 5 40.366
7 585000000 256QAM 3.100 6 40.946
8 849000000 256QAM 0.900 2 38.983
9 609000000 256QAM 3.200 10 40.366
10 615000000 256QAM 3.500 11 40.366
11 621000000 256QAM 3.600 12 40.946
12 633000000 256QAM 4.000 13 40.366
13 639000000 256QAM 3.900 14 40.366
14 645000000 256QAM 3.800 15 40.946
15 651000000 256QAM 3.600 16 40.946
16 657000000 256QAM 3.500 17 40.366
17 663000000 256QAM 3.500 18 40.366
18 669000000 256QAM 3.400 19 40.366
19 675000000 256QAM 3.500 20 40.366
20 681000000 256QAM 3.300 21 40.366
21 687000000 256QAM 3.200 22 40.366
22 693000000 256QAM 2.900 23 40.366
23 699000000 256QAM 2.700 24 40.946
24 705000000 256QAM 2.300 25 40.946
25 711000000 256QAM 2.200 26 40.366
26 717000000 256QAM 1.900 27 40.366
27 723000000 256QAM 1.500 28 38.983
28 825000000 256QAM 1.400 29 40.366
29 831000000 256QAM 1.200 30 40.366
30 837000000 256QAM 1.500 31 40.366
31 843000000 256QAM 1.000 32 38.983
32 279000000 256QAM 3.900 1 40.946
OFDM Downstream Overview
Receiver FFT type Subcarr 0 Frequency(MHz) PLC locked NCP locked MDC1 locked PLC power(dBmv)
0 4K 275600000 YES YES YES 3.400002
1 NA NA NO NO NO NA
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 30596000 ATDMA - 64QAM 31.500 1 6400000
2 38596000 ATDMA - 64QAM 35.000 3 3200000
3 23700000 ATDMA - 64QAM 29.500 2 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
Resident Expert
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Posts: 6,140

Re: CODA-4582 MoCA 2.0 setup

Thats interesting.  On a two port splitter, both output ports should have a -3.5 db drop, unless marked as something else.  My vote is with port #2 for internet ops. 

 

Ok, so, your statement on the cable colours is rather interesting as well, tan in the basement, white upstairs, and that white colour cable upstairs doesn't match up with the white RG-6 cables in the basement.  Conclusion:  you have a splitter buried in a wall or floor somewhere.  If you were able to find it, that could resolve all of these problems. 

 

Edit:  Consider the possibility that if there's no connection in the other rooms upstairs, then its likely that the splitter was left in place, connecting the basement tan coloured RG-6 to the modem's white RG-6 upstairs, which is buried in the wall.  Every other cable might have been disconnected from that splitter at some point in time.  If you can find that splitter and replace it with a modern F-81 connector that might resolve this.  You might also have to replace the cable connectors for those cables ends as well.   Just depends on what sort of shape their in. 

 

Edit 2:  Is all of the white cabling upstairs internal to the house?  Sometimes a tech will run the cabling outside of the house and drill a hole into the external wall to bring the cable into the home.  If any of that cabling ran externally, it might be easier to track down the splitter. 

 

If the white RG-6 modem cable is clamped in an electrical box, take that clamp off to see if you can determine what direction that cable comes from.  If you leave the cable connected to the wallplate F-81 connector, it won't accidentally drop thru the box.  Maybe if you can see what direction that cable is running, it might give you some idea of where to look for that splitter.

 

Edit 3:  If and when you're hunting for the upstairs cable route and splitter location, take the covers off of the cold air return ducts which are at floor level.  Have a look at inside each duct space, up and down, to see if by any chance, there's any cabling that transits thru that space.  Never know, you might get lucky and find the splitter sitting in an upstairs duct. 

 

Also consider the possibility of more than one splitter in different locations.  That would be really painful ......



I Plan to Stick Around
Posts: 35

Re: CODA-4582 MoCA 2.0 setup

@Datalink 

 

Pardon me, if my words sound confusing, my English is kind of bad 😞

 

My current setup is Mainline -> POE filter -> Antronix 2-way splitter with two -3.5dB output -> POE filter -> modem using one of the coaxial port at the basement. (the "tan color" cable is unplugged already)

 

So, there are 2 coaxial port at the basement, I pulled out the wall pate and confirmed the cables behind them are indeed white RG-6 cables.

 

Now, there are also 2 coaxial port at the main floor, one of them is the "tan color" cable, the other one is WHITE with similar writing (this is the one I used to connect with my modem for the past one and half year) as the white RG-6 cable, but no clear indication of RG-6 since the rest of it is in the wall. But after I disconnected the "tan color" cable, that "WHITE" cable lose internet connection. So that means there could be a splitter with the "tan color" cable somewhere but I couldn't find it?

 

At the very last, there are totally four coaxial ports at the second floor which all four of them are "tan color".

 

Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 591000000 256QAM 2.700 7 40.366
2 597000000 256QAM 2.400 8 40.946
3 603000000 256QAM 2.700 9 40.366
4 849000000 256QAM -0.300 2 38.983
5 855000000 256QAM -0.700 3 38.605
6 861000000 256QAM -1.100 4 37.636
7 579000000 256QAM 2.500 5 40.366
8 585000000 256QAM 2.300 6 40.366
9 279000000 256QAM 3.600 1 40.946
10 609000000 256QAM 2.600 10 40.366
11 615000000 256QAM 2.800 11 40.366
12 621000000 256QAM 2.900 12 40.366
13 633000000 256QAM 3.300 13 40.366
14 639000000 256QAM 3.200 14 40.366
15 645000000 256QAM 3.100 15 40.366
16 651000000 256QAM 2.800 16 40.946
17 657000000 256QAM 2.700 17 40.946
18 663000000 256QAM 2.600 18 40.946
19 669000000 256QAM 2.500 19 40.366
20 675000000 256QAM 2.700 20 40.946
21 681000000 256QAM 2.400 21 40.946
22 687000000 256QAM 2.400 22 40.366
23 693000000 256QAM 1.900 23 40.366
24 699000000 256QAM 1.900 24 40.366
25 705000000 256QAM 1.400 25 40.946
26 711000000 256QAM 1.500 26 40.946
27 717000000 256QAM 1.000 27 38.983
28 723000000 256QAM 0.900 28 40.366
29 825000000 256QAM 0.300 29 40.366
30 831000000 256QAM 0.200 30 38.983
31 837000000 256QAM 0.200 31 38.605
32 843000000 256QAM -0.100 32 38.983
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 2.900002
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 23700000 ATDMA - 64QAM 29.000 2 6400000
2 38596000 ATDMA - 64QAM 34.750 3 3200000
3 30596000 ATDMA - 64QAM 30.750 1 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

 

I am safe to assume this tested result is fine for now?

Resident Expert
Resident Expert
Posts: 6,140

Re: CODA-4582 MoCA 2.0 setup

Hi @alan4160, don't worry about your english, you're doing well if english is a second, third, or fourth language, etc, etc 🙂

 

Do the coaxial ports in the basement run to the white RG-6 cables on the splitter?  Just want to be sure.

 

Your signal levels in the last post are fine.  The idea here is to repeat those levels upstairs when this is all done 🙂

 

Looking around, there are test tools that can be used to trace wiring.  The Rogers techs should have a test tool that uses the reflected pulse on a cable line to determine how long the cable run is, and whether or not there are any breaks in the cable.  If you run the same measurement test from both ends of a cable, they should be the same.  If you see a difference in the measured lengths, then there is a break in the cable.  Those measurements could also be used to determine possible locations of the splitter based on a distance calculation.  

 

There are other tools which send out a tone on a selected line, which you can detect with a matched receiver. 

 

Here's one example which can be used to determine what cable goes to what room.  This is only really useful when you have access to both ends of the cable.

 

https://www.youtube.com/watch?v=DGH4cKH97GM

 

Here's a demo of a wire tracer that would probably be useful to trace that tan cable as it arrives on the main floor.

 

https://www.youtube.com/watch?v=71Yzk_RqNvo

 

As that video indicated, you can spend a little amount of money, and, you can spend a lot.  I'd try the lower cost devices first.  It looks like Canadian Tire charges the least for that tester:

 

https://www.google.com/search?q=canadian+tire+sperry+wire+tracer&rlz=1C1PRFI_enCA774CA774&oq=canadia...

 

Here's another Youtube video that shows a similar tool being used:

 

https://www.youtube.com/watch?v=G5k7H_0RQzI

 

So, my thinking is that these might be sensitive enough to detect the tone through the walls.  I've never had to use one of these, so, I don't know if it will work as I'm hoping.  If so, that might make tracing the upstairs cabling relatively easy.  I think I'm going to have to buy one of these just to try it out and determine if its sensitive enough to track a cable thru the wall.  It it is, then it might be possible to connect the transmitter to the upstairs ports, and then locate the other end of the cable, assuming that the cable is disconnected at the splitter.  In that case, the copper centre conductor should function as a small antenna.  All of those cables should lead back to one location upstairs, and possibly one location on the main floor, or just to a single location on the main floor.  

 

Given your description of 4 ports upstairs and 2 on the main floor, that could mean that there is an 8 port splitter installed on the main floor, or possibly a three port on the main floor and 4 port on upstairs.  My bet would be a single 8 port splitter, but, I could be wrong.  An 8 port splitter will drop the signal level by 11 dB, a 16 port splitter will drop the signal level by 13.5 dB.  Either one would explain the signal drop upstairs.  

 

My personal opinion is that you need to find that splitter, wherever it happens to be.  If you don't, I suspect that your idea of using MoCA from that upstairs location simply isn't going to work due to the signal loss thru that splitter and due to the fact that its probably not MoCA rated.  The choice is to try a low cost cable tracer such as the Sperry Wire Tracer and see if you're successful.  If that doesn't work, or you don't want to do that first, then you're going to have to call someone into the home who has the tracing equipment that will do the job.  Those tracers can cost several hundred dollars, so, for a one time application, it doesn't make sense to buy one, unless of course that is still cheaper than hiring a contractor to find the cable.  

 

Can you have a look at my Edit 3, above, about pulling the covers off of the return air ducts to look for the cabling and splitter. 

 

So, unfortunately, more items to consider ......

 

Edit:  is there any way to snake a new RG-6 cable from the basement up to the modem location and simply forget about the tan cable and splitter?