IBM 4800-741 Operation Guide - Page 30
Uninterruptible, power, supply, optional
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Updated October 31, 2007 system. If you power off the unit by pressing and holding the power switch, some programmed events do not function until the unit is powered on again. Examples of these programmed events are IBM Wake on LAN®, and others. Uninterruptible power supply (optional) The technical characteristics of the uninterruptible power supply (UPS) are as follows: v Capacity: 500 VA/300 W v Run time: 2.5 minutes minimum at full-rated (500 VA) load with a new, fully-charged battery v Output voltage in battery mode: 113 V AC ± 10% for low range; 220 V AC ± 10% for high range. v Frequency (in backup mode): 60 Hz ±3 Hz for line frequency > 55 Hz; 50 Hz ±3 Hz for line frequency < 55 Hz (output waveform is a stepped sinewave approximation) v Transfer time: