What hardware is it?

USB Devices
1

Hi, I have a server running with

digi ACCELEPORT 16EM PCI DB25M CONCENTRATOR BOX 70001203

Now I like to add more ports with additional cards and boxes.
I saw the following offers but I cannot find any of this numbers on the website of digi.com
Has anyone an idea what that is axactly and whether I can use it?

PC/Xem 1P 50000202 Acceleport 16em ISA Adapter
Is this a regulare ISA card where I can add 64 ports?
What means the PC/XEM???

DIGI ACCELEPORT 16EM-232 120K, 50001078-01, NEW
Digi DigiBoard Acceleport 16EM 16 port 76000615

Are this two boxes to add additional ports to a PCI or ISA Card? what means the “120K”? Is it for RJ or DB cables?

Thanks for help and best regards
Christian