Onboard connectors + Retimer card

The following shows the cable connections for the 16 x 2.5-inch NVMe (Gen 5) 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	Retimer: C0
2 Backplane 1: NVMe 2-3	Retimer: C1
3 Backplane 1: NVMe 4-5	Onboard: PCIe 6
4 Backplane 1: NVMe 6-7	Onboard: PCIe 5
5 Backplane 2: NVMe 0-1	Onboard: PCIe 7
6 Backplane 2: NVMe 2-3	Onboard: PCIe 3
7 Backplane 2: NVMe 4-5	Onboard: PCIe 2
8 Backplane 2: NVMe 6-7	Onboard: PCIe 1