Cisco Catalyst 9400 Guide D'installation page 140

Retirer et remplacer des unités remplaçables sur site
Connecting the DC-Input Wires
1 Lug secured with the two nuts 2 Grounding wire with heat-shrink sleeve
Étape 6
Attach the four DC-input power source cables similarly.
When facing the terminal block, the circuits are in the following order from left to right: negative (- A), positive
(+A), positive (+ B), and negative (-B).
-A and +A form one DC input, and + B and -B form another. Each DC input can be powered either from
separate sources, or a suitable single source.
Guide d'installation matérielle des commutateurs Cisco Catalyst 9400
134