Consumers - SB6190: Cable Signal Levels
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SB6190: Cable Signal Levels

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Question
What are the acceptable Cable Signal levels for the SB6190 Modem?
Answer
Cable signal levels for all DOCSIS cable modems require to be within the acceptable level for the modem operate properly.  The three signal levels that need to be within the acceptable level are Downstream Power, SNR (Signal to Noise Ratio), and Upstream Power.  Downstream Power refers to the line signal sent from the cable provider to cable modem.  Downstream SNR (Signal to Noise Ratio) refers to the signal being sent in relation to the noise on the line.  Upstream Power refers to the line signal from the cable modem to transmit data back to the cable provider.  This document describes how to check the three signal levels to be within the acceptable level for the modem operate properly. 

To Verify Cable Signal Levels
  1. Launch a web browser, such as Internet Explorer, Firefox, or Safari.  Enter http://192.168.100.1 into the address box.  The Status page will appear.

    NOTE 1: A security or private risk alert may appear on the web browser advising users to proceed with caution when accessing the Web Manager.  There is no risk in proceeding to the Web Manager.  For instructions to by-pass the alert screen, refer to article # 18181 - Alert Message for Web Manager Access.

    NOTE 2: A login page may appear to access the Web Manager.  Enter the default username admin in the Username field and enter the default password password or customized password in the Password field.  For additional information, refer to article # 16148 – SB6190 Web Manager Access.

     
  2. In the Downstream Bonded Channels section, verify Power levels are within the acceptable range of - 15 dBmV to + 15 dBmV for each downstream channel. 

    Right click on the image to save it to your computer.

     
  3. In the Downstream Bonded Channels section, identify the Modulation and Power to find verify SNR levels are within the acceptable range for each downstream channel. 

    Acceptable SNR Levels (dB)
    If QAM64, SNR should be 23.5 dB or greater. 
    If QAM256 and DPL( -6 dBmV to +15 dBmV) SNR should be 30 dB or greater. 
    If QAM256 and DPL(-15 dBmV to -6 dBmV) SNR should be 33 dB or greater.  

    Right click on the image to save it to your computer.

     
  4. In the Upstream Bonded Channels section, identify the number of Channels, Type, Symbolic Rate to find verify Upstream Power levels are within the acceptable range for each upstream channel. 

    Acceptable Upstream Power Levels (dBmV):

    Right click on the image to save it to your computer.

     
    Upstream Transmit Power Level
    ChannelUS Channel TypeSymbol RateAcceptable US Power Level
     
    Single
    TDMA1280 Ksym/sec+61 dBmV to 45 dBmV
    ATDMA2560 Ksym/sec+58 dBmV to 45 dBmV
    5120 Ksym/sec+57 dBmV to 45 dBmV
     
     
    Two
    TDMA1280 Ksym/sec+58 dBmV to 45 dBmV
    ATDMA2560 Ksym/sec+55 dBmV to 45 dBmV
    5120 Ksym/sec+54 dBmV to 45 dBmV
     



    Three or more
    TDMA1280 Ksym/sec+55 dBmV to 45 dBmV
     
     
     
    ATDMA
     2560 Ksym/sec+52 dBmV to 45 dBmV 
     5120 Ksym/sec+51 dBmV to 45 dBmV
  5. Refresh the page at least twice to identify variations in SNR, Downstream Power, and Upstream Power.   

    NOTE: If the either of the signal levels are outside of the acceptable range, power cycle or factory reset the modem. 

     
  6. Contact the cable provider to adjust the signal level to the acceptable level range.
     
Acceptable Signal Levels
 
Recommended Max Downstream
Power Level (DPL)
Recommended Min Downstream
Power Level (DPL)
+15 dBmV-15 dBmV
Downstream Signal to Noise Ratio (SNR)
ModulationDownstream Power LevelAcceptable DS SNR
64 QAMn/a23.5 dB or greater
256 QAM
 
-6 dBmV to +15 BmV30 dB or greater
-6 dBmV to -15 dBmV33 dB or greater
Upstream Transmit Power Level
ChannelUS Channel TypeSymbol RateRecommended Max US Power LevelRecommended Min US Power Level
SingleTDMA1280 Ksym/sec+61 dBmV 45 dBmV
ATDMA2560 Ksym/sec+58 dBmV 45 dBmV
5120 Ksym/sec+57 dBmV 45 dBmV
TwoTDMA1280 Ksym/sec+58 dBmV 45 dBmV
ATDMA2560 Ksym/sec+55 dBmV 45 dBmV
5120 Ksym/sec+54 dBmV 45 dBmV
Three or moreTDMA1280 Ksym/sec+55 dBmV 45 dBmV
ATDMA2560 Ksym/sec+52 dBmV 45 dBmV
5120 Ksym/sec+51 dBmV 45 dBmV

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