A type of signal interference where energy is reflected backward by a discontinuity in the transmission line, and then reflected forward again by a second discontinuity. This double-reflection causes a delayed, attenuated copy of the signal to arrive at the receiver just after the primary signal. In video transmission, this manifests as ghosting on the screen.
Heard on the job
Check the connectors on that coax run, we're getting a forward echo that's ruining the eye diagram.
Related terms
Time-domain reflectometer
An electronic test instrument used to locate faults in metallic cables.
Ghosting
A faint, offset duplicate of a television or display image caused by multipath interference or slow panel response.
Multipath
The phenomenon where a transmitted radio signal reaches a receiver by two or more separate paths.