7750 SR-a4 and 7750 SR-a8 Overview
7750 SR-a4 and SR-a8 Installation Guide 39
Figure 8: 7750 SR-a AC PSU
Refer to Installing, Wiring, and Connecting an AC PSU on page 94 and 7750 SR-a AC PSU
LED and Connectors on page 138 for more information.
7750 SR-a –48 VDC PSU
Figure 9 shows the SR-a –48 VDC PSU.
Figure 9: 7750 SR-a –48 VDC PSU
Refer to Installing, Wiring, and Connecting a –48 VDC PSU on page 98 and 7750 SR-a –48
VDC PSU LED and Connectors on page 139 for more information.
PSU Redundancy
Up to four PSUs can be installed in the front of each chassis. The chassis can support a mix
of AC and DC power supplies.
For the 7750 SR-a4, one PSU can support the full system power requirements if you are
operating without power redundancy. For redundancy, at least two PSUs must be installed
and powered at all times.
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