Asus RS700-E6/RS4 - Manual (Page 46)

Chapter 4: Motherboard information 4-10
3. LPC debug card connector (14-1 pin LPC1)
This connector is for a LPC debug card.
The LPC debug card is purchased separately.
4. Baseboard Management Controller (BMC) connector (14-pin BMC_FW1)
This is an interface used to plug in an ASMB4-SOL or ASMB4-iKVM
management device.
The ASMB4 management device is purchased separately.