SNAA345 December   2020 LMK5C33216

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Wander Generation
    1. 2.1 Wander Generation MTIE Option 1, G.8262 EEC Option 1
    2. 2.2 Wander Generation TDEV G.8262 EEC Option 1
    3. 2.3 Wander Generation MTIE Stratum ITU-T G.8262 EEC Option 2
    4. 2.4 Wander Generation TDEV G.8262 EEC Option 2
  4. 3 Wander Transfer
    1. 3.1 Transfer Function of the PLL for Option 1 and Option 2
    2. 3.2 Wander Transfer TDEV G.8262 Option 2
  5. 4 Wander Tolerance
    1. 4.1 Wander Tolerance G.8262 Option 1
    2. 4.2 Wander Tolerance G.8262 Option 2
  6. 5 Jitter Tolerance
    1. 5.1 Jitter Tolerance G.8262 Option 1 and Option 2
  7. 6 Phase Transient Generation
    1. 6.1 Short-Term Phase Transient Response G.8262 Option 1
    2. 6.2 Short-Term Phase Transient Response G.8262 Option 2
    3. 6.3 Phase Transient Generation With Signal Interruptions G.8262 EEC Option 1
    4. 6.4 Phase Discontinuity G.8262 Option 1
    5. 6.5 Phase Discontinuity G.8262 Option 2
  8. 7 Holdover
    1. 7.1 Holdover G.8262 Option 1
    2. 7.2 Holdover G.8262 Option 2
  9. 8 Free-Run Accuracy
    1. 8.1 Free-Run Accuracy G.8262 Option 1 and Option 2
  10. 9 Pull-In and Hold-In
    1. 9.1 Pull-In Range G.8262 Option 1 and Option 2
  11. 10Conclusion
  12. 11References

6.4 Phase Discontinuity G.8262 Option 1

Passing this test requires that switching between two input clocks of the same frequency but with different phases does not cause an output phase transient greater than what is outlined in Section 11.4.1 of the G.8262 specification. The setup for this test (shown in Figure 6-6) is as follows:

  • There are two inputs that are 180 degrees out of phase going into the DUT
  • The output is measured to ensure that the objective is met

The TIE data for phase discontinuity during reference switchover G.8262 EEC Option 1 (shown in Figure 6-7) indicates compliance to the standard.

GUID-20201210-CA0I-TT6T-VW6D-C5L2PZW3PQG1-low.svgFigure 6-6 Test Setup for Phase Discontinuity
GUID-20201210-CA0I-7KCB-6WSM-1V3J9PT9BB3P-low.svgFigure 6-7 Phase Discontinuity Results