Jitter Transfer Function (JTF)

 

Jitter Transfer defines the ratio of output jitter to input jitter amplitude versus jitter frequency for a given bit rate.

Often, a portion of received jitter is transmitted at a piece of the equipment's output. If LOS is detected during the JTF test, the test will be stopped.

 

  1. Calibration

    Using a short and clean patch cord, connect the test set's TX back to the RX to form a local reference loop.

    Loop Message

  2. Device Under Test (DUT)

    Before starting the test, "Connect Device Under Test" will appear. Connect the test set to the DUT then press Start to begin testing.

    • Frequency (Hz): Frequency measured

    • JTF (Jitter Transfer Function) (dB): Jitter in divided by jitter out value (in dB)

    • Mask (dB): Jitter output in relationship to the input

    • Progress: The bar at the bottom of the graph shows the test progress

 

 

A green cross (x) indicates the the jitter transfer value has passed.

A red cross (x) indicates that the jitter transfer value has failed.

Yellow triangles (▲) indicate that the jitter transfer value is greater than the value measured by the test set.