What are good signal levels

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I'm Here A Lot
Posts: 7

Re: What are good signal levels

It's a black dot modem but from before the posts that said they were retesting the black dot ones,  I never noticed the missing channels before.

I'm Here A Lot
Posts: 7

Re: What are good signal levels

Do I put the amp back in before calling for a signal check.?


This is the amp he installed,  

MRA1-15/ACP one output micro amplifier with power supply

there was no existing wiring to the location the computer/modem sit at so they put a 2way splitter at the tv and ran the rg6 along the back of a sofa and shelf to get to my computer desk.  The new route was street -> amp > 4way -> 2way -> modem.   I can fish a rg6 to the desk pretty easy and move the 2way to the first step.

I'm an Advisor
Posts: 1,130

Re: What are good signal levels

Rogers wont fish any wires, so if you can fish a wire from the computer where to modem is to the utility room where the cable comes in that would be good. You don't need to put the connectors on, the Rogers tech can do that for you, but make sure you use a high quality RG-6 cable. Ultimately You want the Setup like this:


Cable Drop ->

2 Way Splitter: Output 1: Cable Modem, Output 2: to a 3 way splitter for your other devices. 



Resident Expert
Resident Expert
Posts: 7,187

Re: What are good signal levels

Or .... do the following after fishing another RG-6 cable to the desk:


Cable Drop -> 4 port amp with passive VOIP port ->  Devices


Output 1 (Passive Pass Through Voip port):  Internet Modem

Output 2:Home phone ?

Output 3:TV

Output 4:TV


There are amplifiers with a passive VOIP port that have 8 output ports, so, if you need to connect to more devices that is possible.  The first step in all of this is to run another RG-6 cable.   After the cable is run, you should be able to call Rogers to have a tech replace the modem and amp and add connectors onto the new RG-6 run.  The problem,  as usual, is to provide a dedicated cable to the internet modem with the least amount of signal drop as possible and at the same time service all of the other modems.  With a high enough signal level at the very start, this can easily be done with a splitter.  But, when you start at around 0 dBmV or lower, then you need to look at an amplifier with the passive port, or, the tech has to determine why the signal level is too low to start with and get that back up to where it should be.  Sometimes that requires a maintenance crew. 

I Plan to Stick Around
Posts: 26

Re: What are good signal levels

These are my signal levels. Are they okay? It seems the downstream SnR isnt very good? We do have a screw on -5 adjustment piece on it. Having issues with upstream packet loss while gaming, constant 2-5% loss causing major problems.


Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
OFDM Downstream Overview
ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth
130596000ATDMA - 64QAM37.75016400000
238595824ATDMA - 64QAM41.00033200000
323700000ATDMA - 64QAM36.50026400000
Retired Moderator
Retired Moderator
Posts: 624

Re: What are good signal levels

Hi @lupinglade


Thank you for posting on the Community Forums.  Smiley Happy


We'd like to assist with your signal levels and look into the packet loss you are experiencing.


Please send us a private message @CommunityHelps next time you're online so we can take a closer look.



I'm a Reliable Contributor
Posts: 404

Re: What are good signal levels

What are the signal level ranges for Docsis 3


I currently have the following signal levels and want to know what the signal range is.


Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 591000000 256QAM 1.800 7 37.636
2 849000000 256QAM -0.500 2 37.356
3 855000000 256QAM -0.300 3 37.356
4 861000000 256QAM -0.600 4 36.610
5 579000000 256QAM 1.900 5 36.610
6 585000000 256QAM 1.300 6 37.356
7 303000000 256QAM 5.300 1 36.610
8 597000000 256QAM 1.700 8 37.356
9 603000000 256QAM 0.900 9 37.356
10 609000000 256QAM 0.000 10 36.610
11 615000000 256QAM -0.300 11 36.610
12 621000000 256QAM -0.200 12 36.610
13 633000000 256QAM -0.600 13 36.387
14 639000000 256QAM -1.500 14 36.387
15 645000000 256QAM -2.100 15 35.780
16 651000000 256QAM -2.700 16 35.780
17 657000000 256QAM -2.000 17 36.387
18 663000000 256QAM 0.000 18 36.610
19 669000000 256QAM 1.600 19 37.356
20 675000000 256QAM 2.400 20 37.636
21 681000000 256QAM 2.500 21 37.636
22 687000000 256QAM 1.300 22 37.636
23 693000000 256QAM -0.800 23 36.610
24 699000000 256QAM -2.100 24 35.595
25 705000000 256QAM -3.400 25 35.595
26 711000000 256QAM -5.000 26 35.084
27 717000000 256QAM -5.200 27 34.926
28 723000000 256QAM -4.200 28 35.595
29 825000000 256QAM -4.200 29 35.595
30 831000000 256QAM -3.100 30 36.610
31 837000000 256QAM -2.000 31 37.356
32 843000000 256QAM -1.100 32 37.356
OFDM Downstream Overview
Receiver FFT type Subcarr 0 Frequency(MHz) PLC locked NCP locked MDC1 locked PLC power(dBmv)
1 4K 275600000 YES YES YES 5.300003
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 23700000 ATDMA - 64QAM 37.500 2 6400000
2 38596000 ATDMA - 64QAM 41.500 3 3200000
3 30596000 ATDMA - 64QAM 37.500 1 6400000
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 recall it used to be the following:


•Receive/Downstream: -15dbmV to +15dbmV

•Transmit/Upstream: 30dbmV to 53dbmV

•Signal to Noise Ratio(SNR): 33dB or Greater


If I wanted to improve my signal, what level should I aim for? 



Resident Expert
Resident Expert
Posts: 14,300

Re: What are good signal levels

generally, you want it as close to 0 as possible.. with a +/- of 10.

While your highest and lowest are not that too far off..


I think the bigger issue may be how/why its jumping around so much.
Generally you will see it more gradual in my experience.. but you have things like a jump from 1.3 right to 5.3 on adjacent channels

I'm a Reliable Contributor
Posts: 586

Re: What are good signal levels

Generally it should be within this range for DOCSIS 3.0: 


  • Downstream Signal Strength Range: -10 to +10 dBmV
  • Upstream Signal Strength Range: 35 to 52 dBmV


With regards to DOCSIS 3.1:


  • OFDM PLC Power: -9 to +10 dBmV
  • OFDMA uplink values:
  • 29 to 46 dBmV for channels with a bandwidth of 6400000
    32 to 49 dBmV for the channel with a bandwidth of 3200000


@RogersDave are these dBmV values correct for OFDMA? Just making sure Smiley Happy

Resident Expert
Resident Expert
Posts: 7,187

Re: What are good signal levels

At this point, the DOCSIS 3.0 downstream levels really don't mean very much, other than a possible indicator of the level for the DOCSIS 3.1 channel.  The modem is running on DOCSIS 3.1 downstream, so the 3.0 channels are not used.  The OFDM data, frequency and signal level are not correct as displayed in the DOCSIS WAN tab, so, at this point, all you can do is call tech support and ask the CSR what the signal level is for the 3.1 downstream channel and if it is within spec.  The upstream DOCSIS 3.0 signal levels are controlled by the CMTS, so the modem transmits the required output levels as commanded by the CMTS so that the upstream channels arrive at the CMTS at 0 dBmV and greater that 25 dB (?) signal to noise ratio.  That signal to noise number might be exact, don't remember if thats the exact number at the present time.  The upstream levels are higher than I would expect to see, so that might be an indicator of a noise issue between the modem and the CMTS.  That is something you could ask tech support about as well, whether the noise at the modem is in a normal range or if its elevated, and if it is elevated, is it just your cable, or that of your neighbors as well, which would indicate a wider area problem.  


If you're experiencing slow data rates with DOCSIS 3.1 running, you're not the only one.  There have been a few complaints regarding modem performance with 3.1 running.  If this is the case, my first suspicion would be on upstream congestion at the CMTS.  If you look at the last pingplotter post below by @Nadernt, you can see the increased response times from the CMTS in the evening.  They peak out around 50 ms in the afternoon / very early evening, and drop down to somewhere around 20 ms or below in the very early morning.  That might be resolved when DOCSIS 3.1 upstream makes its appearance later this year, and, it might also indicate that some work is required to resolve the performance of the CMTS in the evening hours.  That is something that @RogersDave would have to pass along to the engineering staff responsible for the CMTS equipment.