Arista DCS-7516N - Power Supply Redundancy

34 Quick Start Guide: 7500N Series Modular Switches
Power Supply Redundancy Chapter 4: Cabling the Modular Switch
4.8 Power Supply Redundancy
Important! Installation of this equipment must comply with local and national electrical codes. If necessary, consult
with the appropriate regulatory agencies and inspection authorities to ensure compliance.
Installation de cet équipement doit être conformes aux codes électriques locaux et nationaux. Si
nécessaire, consulter les organismes de réglementation appropriés et des autorités de contrôle pour
assurer la conformité.
Important! Read all installation instructions before connecting the system to the power source.
Lire toutes les instructions d'installation avant de brancher le système à la source d'alimentation.
Most installations will have redundant, dual, independent power feeds.
For the following examples, each power feed originates from a different power provider. Each
independent power feed will be referenced as label A and B.
• Each supply is wired to one feed, either A, or B.
• The recommended installation is to alternate A, B feeds. In a four supply system configuration, you
would wire ABAB, left to right.
• All power supply slots must be filled with a powered supply (A or B), or a blank (X), or a
non-powered power supply.
For supervisor cooling purposes, all systems require a minimum number of operating power supplies
(see Table 4-2) at all times in the top half of the chassis. For optimal performance, alternate pairs of
power supplies (A and B) evenly from top to bottom (8 or more slot chassis).
Valid examples include:
• AXAX Minimum Configuration supported, 2+0 (non-redundant)
• ABAB 2+2 redundant
• ABAB (Upper), AB (Lower) 3+3 redundancy
• ABAB (Upper), ABAB (Lower) 4+4 redundancy
• ABXXAB (Upper), ABXXAB (Lower) 4+4 redundancy (12-slot chassis)
• ABABAB (Upper), ABABAB (Lower) 6+6 redundancy
• AAAX for 3+0 or 2+1 redundancy, with the X anywhere
• AAAA for 4+0 or 3+1 redundancy
• ABABAB (Upper), ABABAB (Lower) 6+6 redundancy (12-Slot Chassis)
• XABAX/XBABX (Upper), XABAX/XBABX (Lower) 6+6 redundancy (16-slot chassis)
• BABAB/ABABA (Upper), BABAB/ABABA (Lower) 10+10 redundancy (16-slot chassis)
Each power supply includes a fan that maintains proper power supply temperature and cools the
supervisor modules. The following appendices display the location of the following component on all
switches described in this guide.
Appendix C displays the front panel location of the supervisor modules.
Appendix D displays the rear panel location of power supplies and fabric modules.