AC-POWER
Issue 1 May 2002
8-5555-233-143
Nominal Power Holdover
Multicarrier Cabinets
Two types of battery holdover are available:
■ The small battery assembly provides short-term battery holdover. If AC
power fails, 48 VDC batteries power the system for:
— 15 seconds in an EPN cabinet
— 10 minutes in the expansion control carrier in the “A” position of an
EPN cabinet
■ Some AC-powered multicarrier cabinets (MCCs) contain three 48-Volt
batteries and a battery charger (397C) to provide backup power in case
power is interrupted. The holdover times are identical to those above.
Single-Carrier Cabinets
A holdover circuit in the power supply allows a system to operate normally during
AC power interruptions. When AC input power fails, reserve batteries supply
power to the memory and processor circuit packs and fans for two minutes. Every
port circuit pack is inactive during this time. The power supply contains a battery
charger to charge the holdover batteries.
Error Log Entries and Test to Clear Values
Table 8-1. AC Power Error Log Entries
Error
Type
Aux
Data Associated Test
Alarm
Level
On/Off
Board Test to Clear Value
0
1
1. Run the short test sequence first. If every test passes, run the long test sequence. Refer to each appropriate
test’s description, and follow its recommended procedures.
0Any Any Anytest environment UU sh r 1
513 Any AC Power Query
test (#78)
WARNING OFF test environment UU sh r 1
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