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 

 

Hi there,

I used the Sperry tracer (in one of the youtube video) for the testing, plugged the transmitter at end of the "tan color" cable in the basement, and used to receiver to check.

 

I got CLEAR beeping sound when testing one of the coaxial port at the main floor (which is the one I used for internet modem for the past one and half year) and one of the port at the second floor

All the remaining ports have the "constant static buzzing" sound but NO BEEPING.

 

So this proves the fact, there is a splitter somewhere? 

 

I checked all the air return ducts at main floor, no lucking finding the splitter 😞

So probably it is the wall somehow, at least some where not easy to find.

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Resident Expert
Resident Expert
Posts: 6,152

Re: CODA-4582 MoCA 2.0 setup

@alan4160 please ensure when you have the transmitter connected to one end of the cable, the other end of the cable is disconnected.  When you run the probe up and down the transmitter end of the cable when its connected in the basement, does it beep, due to any ability to receive the signal outside of the cable jacket?  You might have to increase the probe sensitivity to do this.  If so, then you might have the ability to follow that cable within the wall.  Don't run the tests solely at the wallplate locations.

 

Due to the splitter buried in the wall, you would have to do this from both ends of the cable.  That splitter will decrease any RF energy in the cable when you cross over to the other side of that splitter, so, you really have to treat each wallplate location as a cable section on its own, running the test from each wallplate, moving in the direction where the splitter should be.  What I'm hoping is that with the transmitter connected at each wallplate, that will give you the ability to follow the cable (in the wall) when the probe sensitivity is turned all the way up.  

 

In the room where the modem is located, connect the transmitter, and with the downstairs cable disconnected, see if you can detect that transmitter anywhere around the wallplate.  If you don't know which direction that cables arrives from at the wallplate, don't assume that it goes in the direction of the basement cable.  With the probe right at the wall, sweep all around the wallplate , moving further and further away, and see if the probe can detect the direction that the cable goes.  You may have to go up the wall as well, depending on where that cable might go.  Turn the sensitivity all the way up so that the probe beeps very loudly at the transmitter site.  Keep the sensitivity turned up and hopefully the probe beep will gradually decrease as you move away from the transmitter and keep beeping as you follow the cable path along the wall.

 

Try this at all wallplate locations to see if you have any success anywhere in the house.  Keep the basement tan cable disconnected.  For the upstairs wallplate, maybe they come straight down to the room below?  So you would have to check all around the upstair wallplates with the probe, and perhaps immediately below that location, on the wall that is just below that upstairs wallplate. 

 

If this just doesn't work, the next step would be to call in a company that has a better detection system.  This is only powered by battery, so, perhaps it takes a powered system to generate enough RF energy in the cable so that it can be detected behind the wall.  

 

Can you give this a try and let me know if you have any success at all?  I'll be very interested in your results.  I'm really hoping that the probe is sensitive enough to be able to detect the cables in the wall, but, you're going to have to run that probe right next to the wall to have any success.

 

Edit:  For the wallplate upstairs where you didn't detect anything, take the wallplate off of the wall and see if the cable is connected to the wallplate.  If its is, that implies that the other end of the cable was simply removed off of the splitter, or, it may have been cut.  I'm hoping that it was removed from the splitter.  If so, that far cable end should function as a small antenna.  You might be able to detect that end, wherever it happens to be.  In theory, those upstairs cables should arrive at a splitter upstairs, or downstairs on the main floor.  Hopefully those ends are all on the main floor.  I would test all of the  upstairs wallplates where you did not detect anything, looking to find the other end of the cable.

 

If you do manage to find a potential splitter location, buried in the wall somewhere, are your walls made out of drywall, or is your home old enough that its has lath and plaster walls?



I Plan to Stick Around
Posts: 35

Re: CODA-4582 MoCA 2.0 setup

@Datalink 

 

Hi there,

 

I will try to do it if I have the time. I am also interested in where that splitter located 🙂

 

Since the schools starts and it's very busy, this might take some time.

 

Anyway, thank you so much for spending time explaining everything. You are very patient and helpful 🙂

I Plan to Stick Around
Posts: 35

Re: CODA-4582 MoCA 2.0 setup

@Datalink 

 

Today I tried to put on a singal attenuator 6dB and connect to the main line.

 

Could you please tell me which result is better? Or they are indifference generally speaking.

 

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

RESULT#1 Direct connect to main line with 6dB singla attenuator and two MoCA splitter

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

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1591000000256QAM0.000740.366
2855000000256QAM-3.000338.983
3861000000256QAM-3.500438.605
4579000000256QAM-0.500540.946
5585000000256QAM0.000640.366
6849000000256QAM-2.400238.983
7597000000256QAM-0.200840.946
8603000000256QAM0.400940.946
9609000000256QAM0.2001040.946
10615000000256QAM0.6001140.946
11621000000256QAM0.7001240.366
12633000000256QAM1.2001340.946
13639000000256QAM1.0001440.366
14645000000256QAM0.9001540.946
15651000000256QAM0.9001640.946
16657000000256QAM0.9001740.946
17663000000256QAM0.8001840.946
18669000000256QAM0.8001940.946
19675000000256QAM0.9002040.946
20681000000256QAM0.6002140.946
21687000000256QAM0.4002240.366
22693000000256QAM0.0002340.366
23699000000256QAM-0.2002440.366
24705000000256QAM-0.2002540.946
25711000000256QAM-0.5002640.366
26717000000256QAM-0.9002740.366
27723000000256QAM-0.8002840.946
28825000000256QAM-1.8002940.366
29831000000256QAM-1.6003040.366
30837000000256QAM-1.9003140.366
31843000000256QAM-2.3003240.366
32279000000256QAM1.600140.366
OFDM Downstream Overview
ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
04K275600000YESYESYES0.700001
1NANANONONONA
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth
130596000ATDMA - 64QAM33.25016400000
238596000ATDMA - 64QAM36.50033200000
323700000ATDMA - 64QAM32.50026400000
OFDM/OFDMA Overview
Channel IndexStatelin Digital AttDigital AttBW (sc's*fft)Report PowerReport Power1_6FFT Size
0DISABLED0.50000.00000.0000-inf-1.00004K
1DISABLED0.50000.00000.0000-inf-1.00004K
I Plan to Stick Around
Posts: 35

Re: CODA-4582 MoCA 2.0 setup

@Datalink 

 

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

RESULT#2 Direct connect to main line with 6dB singla attenuator ONLY (no filters)

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

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1591000000256QAM0.400740.366
2855000000256QAM-2.200338.605
3861000000256QAM-2.400438.605
4579000000256QAM0.100540.366
5585000000256QAM0.300640.946
6849000000256QAM-1.700240.366
7597000000256QAM0.200840.946
8603000000256QAM0.600940.946
9609000000256QAM0.8001040.946
10615000000256QAM0.8001140.366
11621000000256QAM1.0001240.946
12633000000256QAM1.6001340.366
13639000000256QAM1.5001440.946
14645000000256QAM1.3001540.366
15651000000256QAM1.6001640.946
16657000000256QAM1.4001740.366
17663000000256QAM1.4001840.366
18669000000256QAM1.3001940.946
19675000000256QAM1.4002040.946
20681000000256QAM1.3002140.946
21687000000256QAM0.9002240.946
22693000000256QAM0.7002340.366
23699000000256QAM0.3002440.366
24705000000256QAM0.1002540.366
25711000000256QAM-0.1002640.946
26717000000256QAM-0.5002740.366
27723000000256QAM-0.6002840.366
28825000000256QAM-1.0002940.366
29831000000256QAM-0.8003040.366
30837000000256QAM-1.1003140.946
31843000000256QAM-1.5003240.946
32279000000256QAM1.800140.946
OFDM Downstream Overview
ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
04K275600000YESYESYES1.000000
1NANANONONONA
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth
130596000ATDMA - 64QAM34.50016400000
238596000ATDMA - 64QAM38.00033200000
323700000ATDMA - 64QAM32.75026400000
OFDM/OFDMA Overview
Channel IndexStatelin Digital AttDigital AttBW (sc's*fft)Report PowerReport Power1_6FFT Size
0DISABLED0.50000.00000.0000-inf-1.00004K
1DISABLED0.50000.00000.0000-inf-1.00004K
I Plan to Stick Around
Posts: 35

Re: CODA-4582 MoCA 2.0 setup

@Datalink 

 

Also, I got a quick question. When testing the downstream and upstream, I noticed that, there are some particular channels, for example, channel ID 2,3,4, 28-32 etc, always have the MOST NEGATIVE values, is that normal? Is that anything I should worried?

Resident Expert
Resident Expert
Posts: 6,152

Re: CODA-4582 MoCA 2.0 setup

Hi @alan4160 the signal levels with the two MoCA splitters might be 1 db less than the signal levels without the splitters.  In your case, it won't make any difference as both of those series of signal levels are fine.  You wouldn't see any difference between the two configurations in terms of the cable system operations, unless that lost splitter comes into the picture.  With that lost splitter in the path, a db or two here or there can make a difference in the very far end equipment.  Typically, that db or two wouldn't make a difference.

 

For the frequencies above 800 Mhz being negative, their not too bad actually.  I've seen much worse.  That due to a High Frequency roll-off that occurs in some neighbourhoods.  Some of the equipment in the neighbouhood requires replacement with higher frequency capable equipment.  That also includes cabling in some cases, such as RG-59 cabling in homes.