TG862G/CT & TG862R: Cable Signal Levels

To Verify Signal Levels

1. Launch a web browser, such as Internet Explorer, Firefox, or Safari. Enter http://10.0.0.1 into the address box, and press the Enter key.  The Login page will appear.
   
   NOTE: By default the LAN IP address is 10.0.0.1. If the default address has been changed, enter the custom address in the address box.
    
2. On the Login page, enter admin in the Username field.
    
3. Enter password in the Password field.
    
4. Click the Login button. The Gateway > At a Glance page will appear.
   
   
    
5. On the left-hand menu, click Gateway.  A sub-menu will appear.
    
6. In the sub-menu, click Connection.  A second sub-menu will appear.
    
7. In the second sub-menu, click XFINITY Network.  The Gateway > Connection > Xfinity Network page will appear.
    
8. In the Downstream section, verify Power levels are within the acceptable range of - 15 dBmV to + 15 dBmV for each downstream channel. 
   
   
    
9. In the Downstream 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.   
   
   
    
10. In the Upstream section, identify the Symbolic Rate to find verify Upstream Power levels are within the acceptable range. 
    
    Acceptable Upstream Power Levels (dBmV):
    
    
     

    Upstream Transmit Power Level
    Channel	US Channel Type	Symbol Rate	Acceptable Upstream Power Levels
    Single	TDMA	1280 Ksym/sec	45 dBmV to 61 dBmV
    	ATDMA	2560 Ksym/sec	45 dBmV to 58 dBmV
    		5120 Ksym/sec	45 dBmV to 57 dBmV
    Two	TDMA	1280 Ksym/sec	45 dBmV to 58 dBmV
    	ATDMA	2560 Ksym/sec	45 dBmV to 55 dBmV
    		5120 Ksym/sec	45 dBmV to 54 dBmV
    Three or more	TDMA	1280 Ksym/sec	45 dBmV to 55 dBmV
    	ATDMA	2560 Ksym/sec	45 dBmV to 52 dBmV
    		5120 Ksym/sec	45 dBmV to 51 dBmV

11. 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. 
     
12. Contact the cable provider to adjust the signal level to the acceptable level range.