Introduction; Two Power Supplies - HP ProCurve 4000M Installation Manual

Connecting the DC Power Supply

Introduction

Introduction
The DC power supplies are DC-to-DC converter modules, enabling the
switch to be operated from centralized -48 or -60 V DC power sources.

Two Power Supplies

When two power supplies are installed, the DC power supplies have the
following features:
• Power load sharing -
The two installed power supplies share the power load, which
increases the life of both power supplies.
• Power redundancy -
If either power supplies fails, the remaining power supply provides
enough power to continue running a fully loaded switch.
• "Hot swap" operation -
Either power supply can be replaced without shutting down or
rebooting the switch.
• Automatic fault detection -
If the power supply encounters a problem, the switch can
immediately detect the condition and report it, using the Power
status and Fault LEDs on the switch. Event messages are also
displayed in the Switch Console Event Log and the web browser
interface Alert Log.
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