LTC4291-1 & LTC4292 Issue

Hi 

We are using LTC4291-1 and LTC4292 in our PSE application. While connecting the the PD through LAN I don't get output. Gate pin stays low always. Below waveform (10x) is the one I'm getting on OUT1A when connecting PD. When PD is not connected  a sawtooth waveform is observed at this pin. In the LTC Qev GUI , it shows "Rsig low"  in the respective port. I have verified the schematic it seems ok. Can you guys help this out? . If you need schematic to look over this I will send it to email if you share one.