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POE LTC4271/LTC4290 -SR-70860-Q5B2L

Question asked by surmat on Jun 12, 2018
Latest reply on Jun 19, 2018 by EHorsma

We have finished new board which is 24 POE PSE port and contains   3 xLTC4271/LTC4290. We are monitoring all registers via I2C.

When we try to plug Ethernet cable to deliver power to the PD device, we  encountered Rsig too Low.

 

I also share with you all register values when is not connected to any Ethernet cable (initial state) and second one is Ethernet Cable plugged to deliver power to the PD device.

First one is not connected to any Ethernet cable (initial state)

  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef

00: 88 e4 00 00 0f 0f 00 00 00 00 32 32 06 06 06 06    ??..??....22????

10: 00 01 ff f0 ff 00 00 a0 00 00 00 64 00 00 00 00    .?.?...?...d....

20: 00 00 03 00 00 00 00 00 00 00 00 00 62 00 b8 22    ..?.........b.?"

30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

40: 00 04 16 09 0f 00 01 d4 80 00 00 01 d4 80 00 00    .????.???..???..

50: 01 d4 80 00 00 01 d4 80 00 00 00 00 00 00 00 00    ???..???........

60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

70: 00 00 03 81 00 00 00 00 00 00 00 00 00 00 00 00    ..??............

80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

 

Second One is Ethernet Cable plugged to deliver power to the PD device. (First Port)

 

    0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef

00: 08 e4 00 00 0f 0f 00 00 00 00 00 00 03 06 06 06    ??..??......????

10: 00 01 ff f0 ff 00 00 a0 00 00 00 64 00 00 00 00    .?.?...?...d....

20: 00 00 03 00 00 00 00 00 00 00 00 00 62 00 bc 22    ..?.........b.?"

30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

40: 00 04 16 09 0f 00 01 d4 80 00 00 01 d4 80 00 00    .????.???..???..

50: 01 d4 80 00 00 01 d4 80 00 00 00 00 00 00 00 00    ???..???........

60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

70: 00 00 03 81 00 00 00 00 00 00 00 00 00 00 00 00    ..??............

80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

e0: 00 00 00 00 00 00 00 00 00 00 00 02 00 00 00 00    ...........?....

f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

 

Best Regards

Suleyman

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