WS-6-Mini on C3560CX

[801.2q]

Hi,
my WS-6-MINI (1.5.5rc2) runs perfectly powered by a Cisco SG300-10PP Switch. All set to "auto" just plugged it in on Port1 and it worked (no external power supply).
But I can not get it running on a Cisco C3560CX-8PC (152-7.E2).
Using different cables it does not power up/no link. To be honest I don`t know where to look at.

Any hint appreciated :-)
Thank you!