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.
In a 3 phase low voltage distribution system, the preferred installation should consist of a five wire system. That 5 wire system would consist of, 3 phase conductors, a neutral conductor and a separate ground conductor. In normal practice, the ground conductor is often the building ground consisting of the metallic building structure.