## 3.20 `T`: Transmission Line

### 3.20.1 Syntax

`T` xxxxxxx n1+ n1-- n2+ n2-- {args}
`.TLIne` xxxxxxx n1+ n1-- n2+ n2-- {args}

### 3.20.2 Purpose

Lossless transmission line.

### 3.20.3 Comments

N1+ and n1-- are the nodes at one end. N2+ and n2-- are the nodes at the other end.
The parameters `TD`, `Freq`, and `NL` determine the length of the line. Either `TD` or `Freq` and `NL` must be specified. If only `Freq` is specified, `NL` is assumed to be .25. The other will be calculated based on the one you specify. If you specify too much, `Freq` and `NL` dominate, and a warning is issued.

### 3.20.4 Element Parameters

`Z0` = x
  Characteristic impedance. (Default = 50.)
`TD` = x
  Time delay.
`Freq` = x
  Frequency for NL.
`NL` = x
  Number of wavelengths at Freq.