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2.5-inch drive backplane cable routing

Use the section to understand the cable routing for the 2.5-inch drive backplane.

Note
  • If necessary, attach the labels to both ends of the cables.
    1. Attach the white space portion of the label to one end of the cable.
    2. Wrap the label around the cable and attach it to the white space portion.
    3. Repeat to attach the other label to the opposite end of the cable.
    Figure 1. Label application
    Label application
  • Pass the power cables through the cable holder and baffle assembly, then route them under the compute tray as illustrated below.
Based on the location of the drive backplane, select the corresponding routing plan:

After you finish cable routing, bundle the cables with cable ties. See Bundle cables connected to the PCIe switch board (bundles 2, 3, 4, and 5).

Backplane 1​

Figure 2. Backplane 1 cable routing
Backplane 1 cable routing
FromToLabel
1 Backplane 1: NVMe connector 0-11 PCIe switch board: NVMe connector 1 (NVME1)
  • BP1 NVME 0-1
  • NVME 1
2 Backplane 1: NVMe connector 2-32 PCIe switch board: NVMe connector 2 (NVME2)
  • BP1 NVME 2-3
  • NVME 2
3 Backplane 1: Power connector3 Power distribution board: Backplane 1 power connector (BP1 PWR)
  • BP1 PWR
  • BP1 PWR
4 Backplane 1: NVMe connector 4-54 PCIe switch board: NVMe connector 3 (NVME3)
  • BP1 NVME 4-5
  • NVME 3
5 Backplane 1: NVMe connector 6-75 PCIe switch board: NVMe connector 4 (NVME4)
  • BP1 NVME 6-7
  • NVME 4

Backplane 2​

Figure 3. Backplane 2 cable routing
Backplane 2 cable routing
FromToLabel
1 Backplane 2: NVMe connector 0-11 PCIe switch board: NVMe connector 5 (NVME5)
  • BP2 NVME 0-1
  • NVME 5
2 Backplane 2: NVMe connector 2-32 PCIe switch board: NVMe connector 6 (NVME6)
  • BP2 NVME 2-3
  • NVME 6
3 Backplane 2: Power connector3 Power distribution board: Backplane 2 power connector (BP2 PWR)
  • BP2 PWR
  • BP2 PWR
4 Backplane 2: NVMe connector 4-54 PCIe switch board: NVMe connector 7 (NVME7)
  • BP2 NVME 4-5
  • NVME 7
5 Backplane 2: NVMe connector 6-75 PCIe switch board: NVMe connector 8 (NVME8)
  • BP2 NVME 6-7
  • NVME 8

Bundle cables connected to the PCIe switch board​

  • Divide the cables connected to the PCIe switch board into six bundles, and secure them to the crossbar with cable ties.
  • Keep the cables away from the PCIe switch board heat sinks.


Figure 4. Securing cables with cable ties
Securing cables with cable ties
BundleCableConnector (on PCIe switch board)
1
Two cables:
  • One PCIe switch board power cable
  • One PCIe switch board sideband cable
  • Power distribution board power connector 1 (PDB PWR1)
  • Power distribution board sideband connector 1 (PDB SB1)
2
Four cables:
  • Two backplane 1 signal cables
  • Two PCIe switch board signal cables
  • NVMe connector 1 (NVME1)
  • NVMe connector 2 (NVME2)
  • MCIO connector 1 (MCIO1)
  • MCIO connector 2 (MCIO2)
3
Four cables:
  • Two backplane 1 signal cables
  • Two PCIe switch board signal cables
  • NVMe connector 3 (NVME3)
  • NVMe connector 4 (NVME4)
  • MCIO connector 3 (MCIO3)
  • MCIO connector 4 (MCIO4)
4
Five cables:
  • One GPU management cable
  • Two backplane 2 signal cables
  • Two PCIe switch board signal cables
  • GPU management connector (MGMT)
  • NVMe connector 5 (NVME5)
  • NVMe connector 6 (NVME6)
  • MCIO connector 5 (MCIO5)
  • MCIO connector 6 (MCIO6)
5
Four cables:
  • Two backplane 2 signal cables
  • Two PCIe switch board signal cables
  • NVMe connector 7 (NVME7)
  • NVMe connector 8 (NVME8)
  • MCIO connector 7 (MCIO7)
  • MCIO connector 8 (MCIO8)
6
Two cables:
  • One PCIe switch board power cable
  • One PCIe switch board sideband cable
  • Power distribution board power connector 2 (PDB PWR2)
  • Power distribution board sideband connector 2 (PDB SB2)