The alarm port is located at the upper left corner of the rear of the system. The ports at the lower part of the system, from left-to-right: serial port (TTYB), USB 0-3 ports, Ethernet (NET) 0 and 1 ports, and the SCSI port. On the ALOM system controller card, the upper port is the serial management port and the lower port is the network management port. The power supply AC connectors, from left-to-right: AC connectors 3, 2, 1 and 0.