Editing Forward echo (section)

{{short description|Propagation of a signal reflection in the same direction as the original}}

In [[telecommunications]], a '''forward echo''' is the propagation of a [[signal reflection]] in the same direction as the original [[signal]] and consisting of [[energy]] reflected back by one discontinuity and then forward again by another discontinuity.  Forward echoes can be supported by reflections caused by splices or other discontinuities in the [[transmission medium]] (e.g. [[optical fiber]], twisted pair, or coaxial tube). In [[metal]]lic lines, they may be supported by [[Impedance matching|impedance mismatches]] between the source or [[Electrical load|load]] and the [[characteristic impedance]] of the transmission medium.  They may cause [[attenuation distortion]].