Can you define the Stratum levels for TDMoP devices?
A8. A Stratum 1 clock is defined as a completely autonomous source of timing, which has no other input other than, perhaps, a yearly calibration. It has an accuracy of 1.0 × 10-11. A Stratum 1 clock may control Stratum 2, 3E, 3, 4E, or 4 clocks. A Stratum 2 clock may drive Stratum 2, 3E, 3, 4E, or 4 clocks. A Stratum 3E clock may drive Stratum 3E, 3, 4E, or 4 clocks. Stratum 2 tracks an input under normal operating conditions, and holds to the last best estimate of the input reference frequency during impaired operating conditions. It has an accuracy of 1.6 × 10-8. Stratum 3 is defined as a clock system that tracks an input as in Stratum 2, but over a wider range. It has an accuracy of 4.6 × 10-6. A Stratum 3 clock may drive Stratum 3 or 4 clocks. A Stratum 4 clock is not recommended as a source of timing for any other clock system. Stratum 3E is a relative new standard created as a result of SONET equipment requirements. It has an accuracy of 1.0 × 10-6. Stratum 4 is defined as a cloc
