16.1 DESCRIBING EQUATIONS AND PARAMETER SETS FOR TWO-PORT NETWORKS
A linear time-invariant two-port network with all the port variables identified is shown in Fig. 16.1-1.
The port-currents are shown to enter the network at both ports. This is a matter of tradition and we have no reason to depart from this tradition. The two port-voltage variables and the two port-current variables are instantaneous variables and are functions of time, in general. However, they could very well be phasors or Laplace Transforms if the two-port network is drawn as a phasor equivalent circuit or an s-domain equivalent circuit, respectively.
The current entering a port through a terminal will leave through the other terminal (Why?)
Now, we consider a general network ...
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