The image shows the external network connectivity for the RA21. The backplane has two power supplies on the left. To the right of this are slots 1 through 3, each with a lower and upper slot. The lower half of slot 1 has a card with two QSFP2B RoCE Fabric ports. The lower half of slot 2 has three management ports labeled left-to-right Serial MGT, ILOM MGT, and HOST MGT. The upper half of slots 1 and 3 are used together, either each with Quad 10G Network cards [factory install], or each with Dual 25G Network cards. The upper half of slot 2 has the option for a Dual 32G HBA (Tape) card that can be field installed. Slot 2 cannot be used for other network cards. The lower half of slot 3 is not used.