Cisco MDS 9000 Series Hardware Installation Manual page 18

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Power Supplies

Figure 5: PSU

To facilitate different data center cooling configurations of hot or cold aisles and racks, there are two models

of PSUs. The first type has airflow with port-side intake and exhaust at the rear of the chassis. The second

type has airflow in the opposite direction, that is, rear-chassis intake and port-side exhaust. The airflow direction

is denoted on each PSU as follows:

• Red—Port-side intake airflow

• Blue—Port-side exhaust airflow

The switch supports PSUs of only one airflow type at a time. Both PSUs have to be either port-side exhaust,

or port-side intake PSUs.

Note

The direction of PSU airflow must match the direction of the fan module airflow.

For more information on installing and removing PSUs, see

Cisco MDS 9124V-K9 Switch Hardware Installation Guide

Overview of Cisco MDS 9124V-K9 Switch

Installing and Removing Power Supply

Units.

Table of Contents

Mds 9124v-k9