3Com 7000 manual Providing Redundancy for Various Power Loads, Other applications

90CHAPTER 7: REDUNDANCY IN THE COREBUILDER 7000 FAMILY ATM SWITCH

Providing Redundancy for Various Power Loads

Table 21 Required Power Supply for Various Installations			(continued)
Other applications
■	CB7000 Switch Card	Single 90A	Single 90A
■	4 X 7262 Ethernet/ATM Interface Card

This section describes when redundant switch cards and redundant power supplies can be used in a CoreBuilder switch.

In order to determine whether a redundant switch card and/or an redundant power supply can be used in a CoreBuilder switch, the total power consumption of all installed cards must be examined. According to the total power consumption, there are three possibilities, as the following examples illustrate:

Installation I: The total power consumption of a single switching card (that is, no redundant card installed) and all interface cards exceeds 90A. In this case, a Dual 90A supply is required so that the second power supply cannot be redundant. A redundant switch card can be installed. This “heavy load” installation is illustrated by the first example installation in Table 21.

Installation II: The total power consumption of two switching cards (i.e., redundant card installed) and all interface cards exceeds 90A but without the second switching card the consumption is less than 90A. In this case, either a redundant switch card or a redundant power supply can be installed, but not both. This “medium load” installation is illustrated by the second example installation in Table 21.

Installation III: The total power consumption of two switching cards and all interface cards does not exceed 90A. In this case, both a redundant switch card and a redundant power supply can be installed. The light load installation is illustrated by the fourth example installation in Table 21.

In all installations that do not include multiple CB7600 cards both redundant switch cards and redundant power supplies can be installed.