SNLA334 june   2023 DP83867CR , DP83867CS , DP83867E , DP83867IR , DP83867IS , DP83869HM

 

  1.   1
  2.   DP83867 and DP83869 TDR
  3.   Trademarks
  4. 1Time Domain Reflectometry
    1. 1.1 Example Connections
      1. 1.1.1 Open Circuit Cable
      2. 1.1.2 Short Circuit Cable
  5. 2DP83867 and DP83869 TDR Implementation
    1. 2.1 TDR Configuration
    2. 2.2 TDR Algorithm
      1. 2.2.1 TDR Algorithm Example Flow
      2. 2.2.2 TDR Algorithm Matlab Example
  6. 3Summary
  7. 4References

1.1.1 Open Circuit Cable

Open cable is easy to diagnose since it generates a strong reflection. No reflection is observed on the other channel. The reflection due to the open circuit is in-phase with the transmitted pulse (positive polarity). Any kind of inductive impedance discontinuity generates in-phase reflection and the amplitude depends on the amount of impedance discontinuity.

GUID-20230525-SS0I-M4D8-ZMDT-BLHLLTDN1WXL-low.svg Figure 1-1 Open Circuit Cable