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TPS23750: POE Basic Detection trouble connecting second POE product with shielded patch cable

Part Number: TPS23750

Hi team,

I'm using a TPS23750 non-isolated, class 0, 5V - 2A

When I connect a first product to a professional POE switch (D-Link or Dell) , everything is always OK, but, when I connect a second product, the fist POE step - Basic Detection - always fails using a shielded patch cable.

There isn't any trouble using a non-shielded patch cable: I connected up to 6 products, everything is OK.

I would like to keep a non-isolated solution (efficiency, cost, size, time).
What can I do to achieve it?

Best regards,

Olivier Dufour