Nortel Meridian 1 option 11C Planning And Installation Manual page 184

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Follow Procedure 28 on page 184 to install an NTAK76 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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