Chapter 4
Cabling the Modular Switch
The following topics are covered in this section:
• Cabling the Power Supplies
• Cabling Chassis Ground
• Cabling the AC Power Supplies
• Cabling the DC Power Supply
• Power Supply Specifications
• Power Supply Configurations
• Power Supply Redundancy
• Connecting Supervisor Cables
• Connecting Line Card Modules and Cables
4.1 Cabling the Power Supplies
Before you begin, refer to the Arista Networks document Compliance and Safety Guide available at:
https://www.arista.com/en/support/product-documentation.
Note: Power supplies may be loaded in the PSU bays in any order. The following order is
recommended for each of the switches covered by this guide.
Table 7: Recommended PSU Bay Population Order
Switch Order
DCS-7804 8, 7, 6, 5, 4, 3, 2, 1
DCS-7808 6, 12, 5, 11, 4, 10, 3,
9, 2, 8, 1, 7
DCS-7812 9, 18, 8, 17, 7, 16, 6,
15, 5, 14, 4, 13, 3, 12,
2, 11, 1, 10
DCS-7816 8, 16, 24, 7, 15, 23,
6, 14, 22, 5, 13, 21,
4, 12, 20, 3, 11, 19, 2,
10, 18, 1, 9, 17
The following figure shows the recommended order. All unpopulated bays should be covered with a
blank (X):.
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