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Option 11C and 11C Mini Technical Reference Guide
Reserve power
Discharge requirements
Reserve batteries must be able to provide 500 watts of power to each cabinet.
This is a worst-case figure based on the maximum power consumption per
cabinet.
Backup options
The options available when backing up the AC-powered Option 11C system
are as follows:
• Use customer-supplied batteries along with the NTAK28 breaker
assembly.
• Connect an Uninterrupted Power Supply (UPS) to the Option 11C
system.
• Use Nortel Networks supplied NTAK75 or NTAK76 battery units.
Customer supplied reserve batteries with NTAK28
Customer supplied batteries may be used as long they meet the requirements
set out in Table 64. One NTAK28 breaker assembly is required per cabinet.
NTAK75 or NTAK76 battery units
Two battery units are available. The NTAK75 supplies a minimum of two
hours backup at full load, while the NTAK76 supplies a minimum of fifteen
minutes backup at full load.
CAUTION
Always follow the manufacturer’s instructions when installing
batteries.
Table 64
Reserve battery requirements
Sealed cells Cell float voltage String float voltage
23 2.30 — 2.36 52.95 — 54.25
24 2.20 — 2.26 52.95 — 54.25