Asus P8B-E/4L User Manual page 52

9. Serial port connectors (10-1 pin COM1/COM2)
Thess connectors are for the serial (COM) ports. Connect the serial port
module cable to one of these connectors, then install the module to a slot
opening at the back of the system chassis.
10. BMC header (BMC_FW1)
The BMC connector on the motherboard supports an ASUS
Management Board 5 Series (ASMB5).
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Chapter 2: Hardware information