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jitter

Definitions:

  non-uniform delays that can cause packets to arrive and be processed out of sequence
Sources:
NIST SP 800-58

  The time or phase difference between the data signal and the ideal clock.
Sources:
NIST SP 800-82 Rev. 2

  The short-term variations of the significant instants of a timing signal from their ideal positions in time (where short-term implies that these variations are of frequency greater than or equal to 10 Hz).
Sources:
NIST IR 8323r1 from ITU-T G.810
NIST IR 8401 from ITU-T G.810