Maintenance-Object Repair Procedures
555-233-143
8-400 Issue 1 May 2002
Power Backup
The small battery is at the center rear of the multicarrier cabinet. This 8-AH (Amp
Hour) battery is fused for short circuit protection and is charged by the
J58890CH-1. The batteries also contain a thermal sensor that changes the
charging voltage depending on battery temperature.
The small batteries provide short-term battery holdover. If AC power fails,
48-V DC 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
Figure 8-20 shows the small battery assembly.
Figure 8-20. Small Battery Assembly
0064_0 RBP 071596
Fuse
Battery
onnector
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