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7-2
C
HAPTER
7: R
EDUNDANCY
IN
THE
C
ORE
B
UILDER
7000 F
AMILY
ATM S
WITCH
Power Supply
Operation
Load Sharing
The power supplies can operate in load-sharing mode; two 90A power
supplies can produce up to 180A. Providing that the power consumption
of the unit does not exceed 90 A, load-sharing allows one power supply
to serve as a backup.
Overloading
When the installed power supply is rated for less than the required power
consumption of the CoreBuilder module, the CoreBuilder will not
succeed in powering up. It will attempt to power up, hit the current
overload rate and turn the power supply off, going through this cycle
repeatedly until the load is reduced.
Calculating the Power
Consumption of
CoreBuilder Switch
The power consumption of an entire CoreBuilder 7000 family ATM switch
unit is calculated by adding up the power consumption of the switching
card(s) and interface cards installed in the chassis. Normally, the values for
typical power consumption can be used in the calculation. Table 7-2
shows the typical power consumption values for the CoreBuilder 7000
family ATM switching cards and interface cards