Universal Broadband Router Hardware Installation Guide

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Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
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Chapter 5 Maintaining the Cisco uBR10012 Router
Removing and Replacing AC PEM Modules
Removing and Replacing AC PEM Modules
The Cisco uBR10012 router ships with two AC power entry modules (PEMs). In this redundant system,
(2 power supplies), one AC PEM provides sufficient power for a fully configured chassis. If one AC PEM
fails, the other automatically begins providing power for the entire router, without impacting system
operations. However, even though one AC PEM provides sufficient power for a fully configured
Cisco
uBR10012 chassis, the system should not be run for extended periods of time with only one AC
PEM. Always install the replacement AC PEM as soon as possible and order a spare for backup.
Note The product order number for a replacement AC PEM is UBR10-PWR-AC=.
Caution For proper airflow, cooling, and safety, do not remove the failed unit until the replacement unit is
available for installation.
Caution The Cisco uBR10012 router supports using either the AC PEM or the DC PEM, but it does not support
mixing AC and DC PEMs. Both PEMs must be either AC PEMs or DC PEMs.
The AC PEMs use standard 200–240 VAC (50/60 Hz) input power obtained through power receptacles
on the front panel of each PEM. The two AC PEMs convert the AC power to provide filtered, redundant,
and load shared DC power to the Cisco
uBR10012 chassis.
Caution The AC PEMs cannot be used with a 100–120 VAC input power source.
Tip For fully redundant power protection, use either an uninterruptible power supply (UPS) or a separate
AC-input power source for each AC PEM.
Note You should be using Cisco IOS Release 12.2(4)XF1, Cisco IOS Release 12.2(4)BC1a, or a later release
when using the AC PEM. If using an earlier release, the show environment command will not correctly
identify the AC PEM’s error messages.
Note You do not need to shut down the Cisco uBR10012 router to replace a redundant AC PEM. If you are
replacing both AC PEMs, you can replace one, bring it online, and then replace the other one to avoid
shutting down the system.