http://192.168.100.1/

Downstream Power:
    +15 to -6 dBmV range, but optimal is +10dBmv to 0 dBmv, 
    with the ideal being close to 5. Values outside of this 
    range would normally result in either an inability to lock 
    onto the network signal, or frequent disconnections.

Upstream Power:
    Anywhere from 35db to 58 on a Surfboard.  
    Generally lower values are better. 
    If you constantly see 58 this would indicate a poor upstream path and probably 
    result in frequent disconnections.

Signal-to-Noise Ratio (SNR):
    For 256QAM downstream a figure above 30 is desirable, above 33 is ideal
    A low SNR is usually the cause of very slow browsing and high packet loss.