Nortel Meridian 1 option 11C Planning And Installation Manual page 180

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• An Uninterruptible Power Supply (UPS) which will provide a
continuous AC power supply. Install this unit according to the
manufacturer's instructions.
If the NTDK78 ac/dc power supply is powered down while it is
operating on DC reserve power from a battery backup unit, the
Option 11C system cannot be powered up again until AC power is
restored. Be careful not to open the circuit breaker, either on the
battery backup unit or on the NTDK78, while the system is operating
on battery backup.
Follow the steps in Procedure 27 on page 180 to install an NTAK75 battery
unit. Repeat the procedure for each system cabinet being installed.
Note: The system external ground must be installed before installing the
battery backup unit.
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Maximum allowed range: 0 ° to 45° C (32 to 110°F)
Recommended range: 20 ° to 35° C (68 to 95 °F).
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