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C
HAPTER
7: R
EDUNDANCY
IN
THE
C
ORE
B
UILDER
7000 F
AMILY
ATM S
WITCH
The CoreBuilder 7000 family power supplies are shown in Table 19.
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 20
shows the typical power consumption values for the CoreBuilder 7000
family ATM switching cards and interface cards.
Table 19
CoreBuilder 7000 Family Power Supplies
Power Supply Current
3Com
Number
CoreBuilder 7000/7000HD AC Power Supply 90A 3C37010A
CoreBuilder 7000/7000HD DC Power Supply 90A 3C37027
CoreBuilder 7000/7000HD DC Power Supply 40A 3C37026
Table 20
Typical Power Consumption of CoreBuilder 7000 Family Cards
Component Description
3Com
Number
Typical
*
Power
Consumption
(Amp)
CoreBuilder Kit and Switching Card
CoreBuilder 7000 Kit (one switching card and
one power supply)
3C37000 6.3
CoreBuilder 7000 Redundant Switching Card
†
3C37016 6.3
CoreBuilder 7000HD Kit (one switching card and
one power supply)
3C37001 8.1