Asus Z8PH-D12/IFB - Manual (Page 48)

2-30 Chapter 2: Hardware information
7. BMC header (BMC_FW1)
The BMC connector on the motherboard supports an ASUS ® Server
Management Board 4 Series (ASMB4).
8. Power Supply SMBus connectors (6-1 pin JP1; JP2)
These connectors allow you to connect SMBus (System Management Bus) to
the power supply unit to read PSU information. Devices communicate with an
SMBus host and/or other SMBus devices using the SMBus interface.