3Com 7000 manual Power Supply Operation Calculating the Power Consumption of, CoreBuilder Switch

86CHAPTER 7: REDUNDANCY IN THE COREBUILDER 7000 FAMILY ATM SWITCH

Power Supply

Operation

Calculating the Power

Consumption of

CoreBuilder Switch

The CoreBuilder 7000 family power supplies are shown in Table 19.

Table 19 CoreBuilder 7000 Family Power Supplies

		3Com
Power Supply	Current	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

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.

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 20 Typical Power Consumption of CoreBuilder 7000 Family Cards

		Typical* Power
	3Com	Consumption
Component Description	Number	(Amp)
CoreBuilder Kit and Switching Card
CoreBuilder 7000 Kit (one switching card and	3C37000	6.3
one power supply)
CoreBuilder 7000 Redundant Switching Card†	3C37016	6.3

CoreBuilder 7000HD Kit (one switching card and 3C37001	8.1
one power supply)