Dear Team,
Thanks for your support!
All our PHYs support TDR. But TDR featurelist will be more or less the same across PHYs.
=> Can any of them also measure the cable length?
Many Thanks,
Jimmy
This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Dear Team,
Thanks for your support!
All our PHYs support TDR. But TDR featurelist will be more or less the same across PHYs.
=> Can any of them also measure the cable length?
Many Thanks,
Jimmy
Hi Jimmy,
We're looking into your question and will get back to you by Wednesday.
Thanks,
Lucas
All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and it is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).
Hi Jimmy,
Once you've run the TDR steps, you can follow the below example to convert the register values to cable length for DP83867.
Assume that after executing the TDR script, location for Peak 0 on Channel A (Register
0x190[7:0]) is recorded as 0x40. The decimal value is 64.
Peak location = (64 * 0.862) – 17
= 55.16 -17
= 38.16 meters
The location of the peak is approximately 38.16 meters from the PHY. This can be used to
detect break in cable, impedance discontinuity or cable length. For measuring cable length,
leave the other side of the cable unconnected and follow the procedure.
Please let me know if you have any other questions, otherwise I'll close the thread.
Thanks,
Lucas
All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and it is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).