Broadcom P411W-32P, User Manual

Broadcom

P411W-32P-UG104

5

P411W-32P PCIe 4.0 

User Guide 

NVMe Switch Adapter



Fedora



FreeBSD

4  Backplane Management

The adapter supports the industry standard 

SFF-TA-1005 Specification for Universal Backplane Management (UBM)

. UBM 

provides the following key features:



Reports the backplane capabilities, including the following:
– NVMe drive widths
– Maximum speeds
– Dual-port support
– Support for drive power enable and disable (PWDIS)



Supports cable order independence 
– Drive LED control and slot ID are not dependent on cable order



Enables drive hot-plug insertion through control of PERST# timing

Refer to the 

SFF-TA-1005 Specification for Universal Backplane Management (UBM)

 for more UBM details.

4.1  SFF-TA-1005 (UBM)-Based Backplanes

Backplanes that use SFF-TA-1005 (UBM) automatically report the slot number to the adapter. For more information, refer to 
the SFF-TA-1005 specification. Because of this automation, no specific cable ordering requirements exist between the 
adapter and the backplane connectors. 

Most backplanes use x4 or x8 host facing connectors. Each x8 connector has an “A” side and “B” side. Use one UBM 
controller for each connector to maximize cable flexibility. The following figure shows a backplane that uses x8 connectors 
with one UBM target for each connector. The red line indicates the I

2

C bus connection.