Front + middle backplanes: 24 x NVMe + 8 x NVMe

This section provides cable routing information for the 24 x NVMe (Gen 4) + 8 x NVMe configuration with three retimer cards.

Connections between connectors: 1 ↔ 1, 2 ↔ 2, 3 ↔ 3, ... n ↔ n

Front backplane cable routing​

Figure 1. NVMe cable routing to onboard connectors and retimer

From	To
1 Backplane 1: NVMe 0-1	Onboard: PCIe 10
2 Backplane 1: NVMe 2-3	Onboard: PCIe 9
3 Backplane 1: NVMe 4-5	Onboard: PCIe 8
4 Backplane 1: NVMe 6-7	Onboard: PCIe 7
5 Backplane 2: NVMe 0-1, 2-3	Onboard: PCIe 6, 5
6 Backplane 2: NVMe 4-5, 6-7	Onboard: PCIe 3, 4
7 Backplane 3: NVMe 0-1	Onboard: PCIe 2
8 Backplane 3: NVMe 2-3	Onboard: PCIe 1
9 Backplane 3: NVMe 4-5, 6-7	Retimer: C0, C1

Middle backplane cable routing​

Figure 2. Middle backplane cable routing

From	To
1 Backplane 5: NVMe 0-1, 2-3	Retimer: C0, C1
2 Backplane 6: NVMe 0-1, 2-3	Retimer: C0, C1
3 Backplane 5: PWR Backplane 6: PWR	Onboard: backplane power Onboard: backplane sideband Riser 1: PWR