45 lines
2.8 KiB
HTML
45 lines
2.8 KiB
HTML
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Battery backup unit" />
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<meta name="abstract" content="A Battery Backup Unit (BBU) provides a safety net for users who do not have an uninterruptible power supply or those with a failed uninterruptible power supply." />
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<meta name="description" content="A Battery Backup Unit (BBU) provides a safety net for users who do not have an uninterruptible power supply or those with a failed uninterruptible power supply." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>Battery backup unit</title>
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<body id="rzahrbbuco"><a name="rzahrbbuco"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Battery backup unit</h1>
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<div><p>A <dfn class="term">Battery Backup Unit (BBU)</dfn> provides a safety net
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for users who do not have an uninterruptible power supply or those with a
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failed uninterruptible power supply. </p>
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<p>The BBU provides 30 seconds of runtime. If ac power is not restored within
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30 seconds, the system immediately goes into a controlled shutdown.</p>
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<p>Systems 620, 640, 650, 720, 730, 740, 830, SB1, SB2, SB3 are equipped with
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a BBU. </p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzahrconcepts.htm" title="Before you use a power-handling program to control system shutdown, you may want to familiarize yourself with related concepts.">Controlled shutdown concepts</a></div>
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