Hi team，
How to dentify cable OPENs and SHORTs? As the 811s spec. said as below:
TDR is activated by setting bit[15] in the TDR Register 0x001E – Time Domain Reflectometry Register. Cable diagnostic status is obtained by reading bits[1:0] in the TDR register. TDR runs are stored in the TDRR Register 0x016B – TDR Results Register. When more than one fault is present, additional locations are identified by the TDRLR1 Register 0x0180 – TDR Location Result Register #1 and the TDRPT Register 0x018A – TDR Peak Type Register.
However, in actual tests, it was found that when the cable was disconnected for more than a period of time (5s), the TDR was checked again and found no errors. The error will only be displayed if the TDR is detected immediately (within 3 s) after disconnection. Is there any test for this, do we need to set other registers? Or could you share the some documents to introduce the diagnosis for 811s? Thanks.
Best regards,
Ansel Song
