T620 RHEL6 : How to recognize external PCIe expansion card via PCIe bus extender

Dear users:

I intermittently detect an PCIe (x1 gen 1) expansion card on an external chassis

The chassis is an iCUBE from MAxexpansion.  I have  one adapter card (x8 Gen2) on slot #1

another in the external chassis and two open x8 slots in the external chassis. 

Only one slot is occupied by the expansion card (x1 Gen 1.0)

BIOS diagnostics on PCIe buses shows slot 7 is downgraded (true but seemingly irrelevant)

Is there anyone who has tried to extend their PCIe bus successfully?

Thanks in advance,

gllore