Eye patterns can be used to show the system performance.  Start with a clean signal and run it through a long cable, the cable loss will close down the eye and also attenuate it greatly.  The amount of distortion is related to the data rate, length and media type.  In this example, the eye is completely closed and the signals are applied to the DS16EV5110A HDMI equalizer.  There are two great benefits from this device, the jitter is reduced as shown by the open eye and the amplitude is re-driven at the full level.  In this case, jitter has been reduced to less than 20% (<0.2 UI – Unit Interval (bit width)). If the data rate is increased some more and the cable length is extended, the signal loss is even greater.  In this case, the DS34RT5110 can be used to recover the eye.  This device features both an active equalizer that greatly reduces the DJ (deterministic jitter) and a reclocker (a.k.a. retimer) that further cleans up the jitter and reduces the RJ (random jitter) component as well.  Jitter is now well under 10%.  The signal is re-driven with the driver signal conditioning option to pre-correct for loss that is encountered in the next cable leg.  The final result is a wide open eye that meets the downstream device’s requirements.