Cisco MDS 9000 Series Hardware Installation Guide

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.
The direction of PSU airflow must match the direction of the fan module airflow.
Note
For more information on installing and removing PSUs, see Installing and Removing Power Supply Units.
Cisco MDS 9148V-K9 Switch Hardware Installation Guide
12
Overview of Cisco MDS 9148V-K9 Switch
Power Supplies

Cisco MDS 9000 Series Specifications

General

Category	Switch
Operating System	Cisco NX-OS
Ports	Varies by model
Protocols	Fibre Channel (FC), Fibre Channel over IP (FCIP), iSCSI
Redundancy	Redundant supervisors, power supplies, and fans
Management	Cisco Data Center Network Manager (DCNM), CLI, SNMP
Virtualization Support	VSANs (Virtual SANs)
Security Features	Fibre Channel Security Protocol (FC-SP)
Hot Swappable Components	power supplies, fans
Power Supply Options	AC and DC options available