Hybrid two port network models
AS photon describes the 2 port parameters are determined by the Laplace parameters S11 thru S22.

There also exists an inverse relationship called y parameters.

Both have determinates D in the matrix calculations and may be used to convert from s to y and visa versa.

s parameters are more useful for cascaded networks.

y parameters are more useful for parallel networks.

Full explanation are in the links above.