Artificial transmission line
![](http://upload.wikimedia.org/wikipedia/commons/thumb/5/56/Artificial_Telephone_Line_6000ft%2C_24_gauge%2C_Schematic.png/220px-Artificial_Telephone_Line_6000ft%2C_24_gauge%2C_Schematic.png)
In telecommunication, an artificial transmission line is a two-port electrical network that has the characteristic impedance, transmission time delay, phase shift, or other parameter(s) of a real transmission line. It can be used to simulate a real transmission line in one or more of these respects.[1]
Early artificial lines were used in telephony research and took the form of a cascade of lattice phase equalisers to provide the necessary delay. The lattice phase circuit was invented by Otto Zobel in the 1920s.[2][3]