Technical Helpweb

The PCI-X specification is designed to be compatible with the PCI standard so that PCI boards with correct specifications can work in both PCI and PCI-X slots. PCIU ('PCI Universal') is a term used to describe boards that will work in both PCI and PCI-X slots.

Currently available Dialogic^® Brooktrout^® PCI Fax Boards are PCIU boards that will work in both PCI and PCI-X slots. There are no purely PCI-X Fax Boards among the Dialogic^® Brooktrout^® range of Fax Boards, but currently available Brooktrout PCI Fax Boards are PCIU boards and are compliant with the PCI-X standard. This means that Brooktrout PCIU Fax Boards will work in slots that are fully compliant with the PCI-X standard. 

Part of the PCI-X specification is that the PCI bus can be clocked at 33MHz if this is required by one of the installed PCI boards. Dialogic^® Brooktrout^® Fax Boards with a PCIU interface will work in a PCI-X slot only if the PCI bus can be clocked at 33MHz.  
 

* Brooktrout TR1034 Fax Boards contain the type of PCI slot in their name, either with a 'P' for PCIU or an 'E' for PCI-express.
For example: TR1034+E....  is a PCI-express board and TR1034+P... is a PCIU board.