Transmission line modelled as discretised telegraph-equation, 'π-elements'.
The line of total length len is divided into elements of length delta = len/ne.
It is composed of ne-1 interior elements of length delta and at each end of a half-element of length delta/2.
Therefore it contains ne interior nodes. Each element corresponds to a series resistor-inductor with values R and L corresponding to its length. A shunt parallel capacitor-conductor is linked to each node.
The minimum of ne is 1.