Consumers - SBG6700-AC (v8.6.x): Cable Signal Levels
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SBG6700-AC (v8.6.x): Cable Signal Levels

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Question
What are the acceptable RF Signal levels for the SBG6700-AC Gateway?
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. 


Checking Signal Levels

  1. Launch a web browser, such as Internet Explorer, Firefox, or Safari.  Enter http://192.168.0.1 into the address box, and press the Enter key.  The Login page will appear.

    NOTE: 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.
     
  2. On the Login page, enter admin or a customized username in the Username field.
     
  3. Enter password or a customized password in the Password field.

    NOTE: On later versions of the SBG6700-AC, the Wi-Fi Security Key is used as the default admin password printed on the bottom while label.  For assistance with Web Manager Access, refer to article # 18754 – SBG6700-AC: Web Manager Access.


    User-added image
     
  4. Click the Login button.  The Home page will appear.

    Right click on the image to save it to your computer.
     
  5. Move the mouse-cursor over Status on the main menu, and click the Connection link on the sub-menu.  The Status - Connection page will appear.
     
  6. In the Downstream Bonded Channels section, verify Power levels are within the acceptable range of - 15 dBmV to + 15 dBmV for each downstream channel. 

    User-added image

     
  7. 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 QAM64SNR 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.

     
  8. In the Upstream Bonded Channels section, identify the number of ChannelsTypeSymbolic 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 Upstream Power Levels
    Single
     
     
    TDMA1280 Ksym/sec45 dBmV to 61 dBmV
    ATDMA2560 Ksym/sec45 dBmV to 58 dBmV
    5120 Ksym/sec45 dBmV to 57 dBmV
    TwoTDMA1280 Ksym/sec45 dBmV to 58 dBmV
    ATDMA2560 Ksym/sec45 dBmV to 55 dBmV
    5120 Ksym/sec45 dBmV to 54 dBmV
    Three or moreTDMA1280 Ksym/sec45 dBmV to 55 dBmV
    ATDMA2560 Ksym/sec45 dBmV to 52 dBmV
    5120 Ksym/sec45 dBmV to 51 dBmV 
  9. 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. 

     
  10. Contact the cable provider to adjust the signal level to the acceptable level range.

Acceptable Signal Levels
 
Acceptable Downstream Power Level 
-15 dBmV to +15 dBmV
Downstream Signal to Noise Ratio (SNR)
ModulationDownstream PowerAcceptable Downstream 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 RateAcceptable Upstream Power Levels
Single (1)TDMA1280 Ksym/sec45 dBmV to 61 dBmV 
ATDMA2560 Ksym/sec45 dBmV to 58 dBmV  
5120 Ksym/sec45 dBmV to 57 dBmV  
Two (2)TDMA1280 Ksym/sec45 dBmV to 58 dBmV 
ATDMA2560 Ksym/sec45 dBmV to 55 dBmV  
5120 Ksym/sec45 dBmV to 54 dBmV  
Three or more (>=3)TDMA1280 Ksym/sec45 dBmV to 55 dBmV  
ATDMA2560 Ksym/sec45 dBmV to 52 dBmV  
5120 Ksym/sec45 dBmV to 51 dBmV  

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