What is an Eye diagram?

What is an eye diagram?

An eye diagram is an overlay of all possible received bit sequences, e.g. the sum of…

Note: should really be an overlap of “infinitely long” bit sequences to get a true eye.  This catches all potential inter-symbol interference

results in…

(the above is considered to be an “open” eye)

 Eye diagrams can be used to evaluate distortion in the received signal, e.g. a “closed” eye

Note:More the wide open eye more the network is error-free