Onboard connectors + One retimer card

The following shows the cable connections for the front 24 x 2.5-inch NVMe configuration with one retimer card.

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

Figure 1. NVMe cable routing to onboard connectors and retimer card

From	To
1 Backplane 1: NVMe 0-1	1 Onboard: PCIe 5
2 Backplane 1: NVMe 2-3	2 Onboard: PCIe 7
3 Backplane 1: NVMe 4-5	3 Onboard: PCIe 6
4 Backplane 1: NVMe 6-7	4 Onboard: PCIe 8
5 Backplane 2: NVMe 0-1	5 Onboard: PCIe 4
6 Backplane 2: NVMe 2-3	6 Onboard: PCIe 3
7 Backplane 2: NVMe 4-5	7 Onboard: PCIe 2
8 Backplane 2: NVMe 6-7	8 Onboard: PCIe 1
9 Backplane 3: NVMe 0-1	9 Retimer card: C0
10 Backplane 3: NVMe 2-3	10 Retimer card: C1
11 Backplane 3: NVMe 4-5	11 Onboard: PCIe 9
12 Backplane 3: NVMe 6-7	12 Onboard: PCIe 10, 11