TXXXXXXX N1 N2 N3 N4 Z0=VALUE <TD=VALUE> <F=FREQ + <NL=NRMLEN>> <IC=V1,I1,V2,I2>
Example:
T1 1 0 2 0 Z0=50 TD=10NS
N1 and N2 are the nodes at port 1; N3 and N4 are the nodes at port 2. Z0 is the characteristic impedance. The length of the line may be expressed in either of two forms. The transmission delay, TD, may be specified directly (as TD=10ns, for example). Alternatively, a frequency F may be given, together with NL, the normalized electrical length of the transmission line with respect to the wavelength in the line at the frequency F. If you specify a frequency but omit NL, 0.25 is assumed (that is, the frequency is assumed to be the quarter-wave frequency).
NOTE: Although both forms for expressing the line length are optional, you must specify one of the two. This element models only one propagating mode.
If all four nodes are distinct in the actual circuit, then two modes may be excited. To simulate such a situation, two transmission-line elements are required.
The (optional) initial condition specification consists of the voltage and current at each of the transmission line ports.
The initial conditions (if any) apply only if you specify the UIC option on the .TRAN statement.