POE LTC4271/LTC4290 -SR-70860-Q5B2L

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

Parents
  • Hi Suleyman,

    What PD are you testing with, and have you tested with different boards like our LT4275 demo circuit?  Can you provide a schematic for your PSE board, and if you built the PD board, the schematic for that as well? Which LTC4290 are you using, A, B, or C?

    Best Regards,

    Eric

Reply
  • Hi Suleyman,

    What PD are you testing with, and have you tested with different boards like our LT4275 demo circuit?  Can you provide a schematic for your PSE board, and if you built the PD board, the schematic for that as well? Which LTC4290 are you using, A, B, or C?

    Best Regards,

    Eric

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