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.
Remember that they are reciprocal functions. When the cosine is zero, the secant is undefined. When the cosine is at a maximum value, the secant is a minimum. When the cosine is at a minimum, the secant is a maximum. Period length is 2p Keep in mind that when a graph is undefined, there is a vertical asymptote.