It could be many things. 1  Gather facts. 2  Rule out equipment... 3  Back to gathering facts... 4  Call Comcast.  Good 1  luck. Have your problems always existed (with your current installation/configuration)?  When speaking with anyone...
A maximum-phase system is the opposite of a minimum phase system. A causal and stable LTI system is a maximum-phase system if its inverse is causal and unstable. That is, 1  The zeros of the discrete-time system are outside the unit circle.
Three phase transmission system: A three phase supply is usually a three wire system in the transmission side. A transmission system doesn't have any load connected to it directly. The power flowing in a transmission system is unusable. It is usually rated at 11 kV, 33 kV, 132 kV, 400 kV, 765 kV, etc.