What are good signal levels

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I Plan to Stick Around
Posts: 9

Re: What are good signal levels

From this morning:

 

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1693000000256QAM-5.9004736.610
2363000000256QAM-2.6001038.605
3369000000256QAM-2.2001137.636
4375000000256QAM-2.6001237.636
5381000000256QAM-2.4001337.356
6387000000256QAM-3.2001437.356
7393000000256QAM-2.9001538.605
8399000000256QAM-3.1001637.356
9405000000256QAM-3.4001737.356
10411000000256QAM-3.2001837.636
11417000000256QAM-3.4001937.356
12423000000256QAM-3.3002037.356
13429000000256QAM-2.9002137.636
14435000000256QAM-3.0002238.605
15441000000256QAM-2.6002338.983
16447000000256QAM-2.6002437.636
17555000000256QAM-2.9002538.605
18561000000256QAM-2.9002637.636
19567000000256QAM-3.0002737.356
20573000000256QAM-3.1002837.636
21681000000256QAM-5.2004537.356
22687000000256QAM-5.5004636.610
23357000000256QAM-2.000937.636
24699000000256QAM-5.8004836.387
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandWidth
123700000ATDMA - 64QAM36.75026400000
238596000ATDMA - 64QAM38.50033200000
330596000ATDMA - 64QAM38.00016400000
I Plan to Stick Around
Posts: 19

Re: What are good signal levels

Signal levels?

 

Just had Popular TV, Gigabit internet and home phone installed yesterday. The tech split the cable with one 2 way to the home phone and then the other line to the living room. Then he used another 2 way splitter behind the entertainment centre with one leg to the 4K PVR and the other leg to the CGMN 3552 modem. I've notice some frequencies are lower than -10 dbmv. Will these signals below cause issues? I'm not having any yet.

 


Hitron
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System Information
DOCSIS Provisioning
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DOCSIS WAN

DHCP Lease Time D: 06 H: 18 M: 35 S: 56
Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 633000000 256QAM -6.600 37 38.605
2 363000000 256QAM -11.100 10 36.387
3 369000000 256QAM -11.000 11 36.387
4 375000000 256QAM -10.700 12 36.387
5 381000000 256QAM -10.300 13 36.610
6 387000000 256QAM -10.300 14 36.387
7 393000000 256QAM -10.200 15 36.610
8 399000000 256QAM -9.900 16 37.356
9 405000000 256QAM -9.900 17 37.356
10 411000000 256QAM -9.500 18 37.356
11 417000000 256QAM -9.800 19 37.356
12 423000000 256QAM -9.600 20 37.636
13 555000000 256QAM -6.400 25 40.366
14 561000000 256QAM -6.500 26 38.983
15 567000000 256QAM -6.400 27 40.946
16 573000000 256QAM -6.500 28 38.605
17 579000000 256QAM -6.600 29 40.366
18 585000000 256QAM -6.400 30 40.366
19 591000000 256QAM -6.200 31 40.366
20 597000000 256QAM -6.500 32 40.366
21 603000000 256QAM -6.100 33 38.983
22 609000000 256QAM -6.100 34 38.983
23 615000000 256QAM -6.500 35 40.366
24 621000000 256QAM -6.500 36 40.366
25 357000000 256QAM -10.800 9 36.200
26 639000000 256QAM -6.400 38 39.200
27 645000000 256QAM -6.300 39 39.500
28 651000000 256QAM -6.500 40 39.500
29 657000000 256QAM -6.100 41 39.500
30 663000000 256QAM -6.100 42 39.500
31 669000000 256QAM -6.100 43 39.500
32 675000000 256QAM -6.200 44 39.500
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID BandWidth
1 38596175 ATDMA - 64QAM 41.500 3 3200000
2 30596000 ATDMA - 64QAM 40.250 1 6400000
3 23700000 ATDMA - 64QAM 40.500 2 6400000
© 2017 Hitron Technologies Inc.. All rights reserved.

Resident Expert
Resident Expert
Posts: 1,058

Re: What are good signal levels

your signal levels are out've spec, -10 to 10 are the limits for Rogers. 

Call Rogers and have a tech come to make some changes, it could be bad connectors or bad RG-6, also if posible try and get the cable modem on the first split from the cable drop

 



I Plan to Stick Around
Posts: 11

Re: What are good signal levels

1 597000000 256QAM -3.500 32 37.636
2 579000000 256QAM -4.100 29 37.356
3 585000000 256QAM -4.000 30 37.356
4 591000000 256QAM -3.900 31 37.356
5 573000000 256QAM -3.900 28 37.356
6 603000000 256QAM -3.200 33 37.636
7 609000000 256QAM -2.900 34 37.636
8 615000000 256QAM -3.500 35 37.636
9 621000000 256QAM -3.600 36 37.356
10 633000000 256QAM -3.900 37 36.610
11 639000000 256QAM -3.400 38 37.356
12 645000000 256QAM -3.500 39 37.356
13 651000000 256QAM -3.100 40 37.636
14 657000000 256QAM -3.100 41 37.356
15 663000000 256QAM -3.500 42 37.356
16 669000000 256QAM -3.200 43 37.636
17 675000000 256QAM -3.100 44 37.356
18 681000000 256QAM -2.600 45 37.356
19 687000000 256QAM -2.400 46 37.636
20 693000000 256QAM -2.100 47 37.636
21 699000000 256QAM -2.200 48 37.636
22 705000000 256QAM -2.000 49 37.636
23 711000000 256QAM -1.400 50 37.636
24 717000000 256QAM -1.100 51 37.636
25 723000000 256QAM -1.000 52 37.600
26 825000000 256QAM -0.100 53 38.200
27 831000000 256QAM -0.400 54 38.600
28 837000000 256QAM -0.800 55 38.200
29 843000000 256QAM -1.700 56 37.900
30 849000000 256QAM -2.900 57 37.600
31 855000000 256QAM -3.500 58 37.900
32 861000000 256QAM -4.000 59 37.300
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID BandWidth
1 23700000 ATDMA - 64QAM 52.250 2 6400000
2 38596000 ATDMA - 64QAM 52.500 3 3200000
3 30596000 ATDMA - 64QAM 53.000 1 6400000

 

Also getting tons of T3 timeouts (in which the connection isnt usable).

 

Assume the Upstream power levels of 52-53 are out of spec and I should be calling Rogers?

Resident Expert
Resident Expert
Posts: 5,812

Re: What are good signal levels

@wp519, yes, call tech support.  Ask the CSR to run a signal check on the modem.  That check should fail automatically due to the high upstream levels which are above the max level.  The CSR should then arrange for a tech visit to determine and correct the issue. 

 

The downstream levels aren't too bad, dropping down into the -3/-4 dBmV range, but thats ok, and your downstream signal to noise ratios are ok. 



I'm Here A Lot
Posts: 7

Re: What are good signal levels

My docsis results are below,  I saw in other forums that they should range from -10 to 10 so I had them do a signal check.   Tech came out and installed an amplifier on the incoming cable line before the 4 way splitter which brought levels up to -1 to -3 but the signal to noise was fine on the first 2 channels and the last 2 all the middle ones were in the 4 range and then internet cacked out within 30 mins of tech leaving.  I took the amplifier back out so back to the levels below.   Current setup is a 4 way splitter coming into house going to 2 tv's, home phone and a line to a 2way splitter that feeds tv and internet.  What is the best layout if I want to move things around for a better signal to the modem?  

 

Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 693000000 256QAM -14.300 47 30.421
2 363000000 256QAM -11.400 10 31.136
3 369000000 256QAM -11.900 11 31.072
4 375000000 256QAM -11.800 12 30.421
5 381000000 256QAM -11.600 13 31.136
6 387000000 256QAM -11.600 14 31.136
7 393000000 256QAM -11.700 15 31.404
8 399000000 256QAM -11.600 16 31.404
9 405000000 256QAM -11.400 17 31.616
10 411000000 256QAM -11.600 18 31.616
11 417000000 256QAM -11.700 19 31.404
12 423000000 256QAM -11.800 20 31.335
13 429000000 256QAM -11.900 21 31.335
14 435000000 256QAM -11.600 22 31.616
15 441000000 256QAM -11.800 23 31.616
16 447000000 256QAM -11.700 24 31.616
23 591000000 256QAM -12.600 31 30.824
27 615000000 256QAM -13.100 35 30.421
28 621000000 256QAM -13.200 36 30.366
29 633000000 256QAM -13.200 37 30.647
30 639000000 256QAM -13.400 38 30.589
31 645000000 256QAM -13.500 39 30.647
32 651000000 256QAM -13.700 40 30.589
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 NA NA NO NO NO NA
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 23700000 ATDMA - 64QAM 35.750 5 6400000
2 38595785 ATDMA - 64QAM 39.750 6 3200000
3 30596000 ATDMA - 64QAM 35.750 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

 

 

I'm a Reliable Contributor
Posts: 564

Re: What are good signal levels


Ed15 wrote:

My docsis results are below,  I saw in other forums that they should range from -10 to 10 so I had them do a signal check.   Tech came out and installed an amplifier on the incoming cable line before the 4 way splitter which brought levels up to -1 to -3 but the signal to noise was fine on the first 2 channels and the last 2 all the middle ones were in the 4 range and then internet cacked out within 30 mins of tech leaving.  I took the amplifier back out so back to the levels below.   Current setup is a 4 way splitter coming into house going to 2 tv's, home phone and a line to a 2way splitter that feeds tv and internet.  What is the best layout if I want to move things around for a better signal to the modem?  

 

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1693000000256QAM-14.3004730.421
2363000000256QAM-11.4001031.136
3369000000256QAM-11.9001131.072
4375000000256QAM-11.8001230.421
5381000000256QAM-11.6001331.136
6387000000256QAM-11.6001431.136
7393000000256QAM-11.7001531.404
8399000000256QAM-11.6001631.404
9405000000256QAM-11.4001731.616
10411000000256QAM-11.6001831.616
11417000000256QAM-11.7001931.404
12423000000256QAM-11.8002031.335
13429000000256QAM-11.9002131.335
14435000000256QAM-11.6002231.616
15441000000256QAM-11.8002331.616
16447000000256QAM-11.7002431.616
23591000000256QAM-12.6003130.824
27615000000256QAM-13.1003530.421
28621000000256QAM-13.2003630.366
29633000000256QAM-13.2003730.647
30639000000256QAM-13.4003830.589
31645000000256QAM-13.5003930.647
32651000000256QAM-13.7004030.589
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 - 64QAM35.75056400000
238595785ATDMA - 64QAM39.75063200000
330596000ATDMA - 64QAM35.75046400000
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

 

 


@Ed15 Removing the amplifier has actually made your downstream signal strength worse. In this case, b/c you don't have an amplifier your signal levels are out of spec; they're really weak. I HIGHLY suggest to re-install the amplifier which will increase your downstream signal strength. The tech installed the amplifier because he noticed that your signal levels are weak. Once you install the amplifier back, reboot the modem and your signal levels should be fine. 

 

What you could also do to ensure good signal strength is to replace old coaxial cables with new ones that have shielding against interference. You can buy high-quality coaxial cables from Lowe's or Home Depot. Because everything is connected together, a cheap coaxial cable can actually cause interference issues and lower your signal strength. 

 

Resident Expert
Resident Expert
Posts: 5,812

Re: What are good signal levels

Nope, the amplifier that Rogers uses does not have an amplified port for the Internet cable.  Its a straight thru port with a -3.5 loss.  This is done so that the intenet data does not suffer any packet loss due to the amplifier.  The solution here is to address the low signal levels arriving from the external cable.  Adding an amplifier only amplifies an already poor signal. 

 

Call tech support and ask the CSR to run a signal check on the modem.  That check will fail automatically and the CRS will arrange for a tech to visit your home again.  Indicate that you have already had a tech out to your home, I'm assuming it was a contract tech, and ask for a senior tech, which is a Rogers tech.  Ask the CSR to check your neighbors modems as well for the signal levels.  If they are low, and I'm assuming that they might be, that points to a problem further upstream, which might require a maintenance crew instead of a tech. Hopefully this time around, you can get the right person or staff working on the problem.

 

Looking at your signal levels, it appears that you have an original CODA-4582.  You're missing several channels which indicates an EMI issue between the 2.4 Ghz and the Docsis tuner.  You will need to swap your modem for the same model modem but, the new batch has a black dot on the outside of the packing box and near the power cord plug in point of the modem.  That modem has additional shielding to prevent that EMI. 

 

In terms of the best configuration for the cabling, the very best, if the signal levels can't be brought up is to install the amplifier and run the internet feed cable off of the non-amplified port.  Ideally that cable would not be split any further, but, even it was, the total loss from the street ot the modem would be -7 dB instead of -10/11 dB.  That alone might be enough to make a difference.  The remaining devices would be fed from the amplified ports of the amplifier.  On the amplifier itself, there should be one port marked VOIP, which is straight thru, non-amplified.  That is the port that is used for the internet as well.



I'm Here A Lot
Posts: 7

Re: What are good signal levels

Tech told me the incoming signal is good,  I assuem it is low as it looses 7.5 at the first splitter then 3.5 at the 2nd.  He tried amping everything with an amp with only 1 output.

Resident Expert
Resident Expert
Posts: 5,812

Re: What are good signal levels

The amp only has one input port and one output port?  Can you read my additional comments above regarding the modem and cable configuration.  You are correct about the splitter losses.



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