Provisioning Page111 of 544
Option11C and 11C Mini TechnicalReference Guide

•battery backup time for the NTAK75

•battery backup time for the NTAK76

Use the circuit-card power-consumption table and worksheets provided

below.

Procedure
1Determine the circuit card configuration in each system cabinet.
Record the card codes against their cabinet slot numbers, on
“Worksheet Ga: System power consumption: Main cabinet” on
page146 through “Worksheet Ge: System power consumption: fourth
expansion cabinet” on page150.
2For each circuit card, transfer the power consumption values from
“Worksheet G: System power consumption” on page144 to the power-
consumption column on the corresponding
Worksheets Ga - Ge.
3Calculate the total option 11C system power consumption on
“Worksheet Gf: Total Option 11C system power consumption” on
page151.
4If your system is AC-powered, go to “Worksheet H: Battery current and
AC line calculation for ACsystems using NTAK75 and NTAK76” on
page153. If your system is DC-powered, go to“Worksheet I: Battery
current calculation for customer-provided DC reserve power” on
page154.
5Transfer the Pout (Main) and Pout (Expan.) values from
Worksheet G to Worksheet H or I.
6Calculate Pin (Main), I Batt (Main), Pin (Expan), and I Batt (Expan) as
shown on Worksheet H or I.
7Calculate Iline if required, as shown on Worksheet H.
8Transfer the values calculated for I Batt (Main) and I Batt (Expan), onto
the NTAK75/QBL24A1 and the NTAK76 discharge time graphs.
9Selectthe battery unit that provides themost appropriate backup time.
Note: For customer-provided DC reserve power systems, use I Batt
(Main) and I Batt (Expan) along with the battery manufacturer’s
specifications to determine battery requirements and backup times.