3com 5500G-EI Manual De Usuario

C

HAPTER

 2: I

NSTALLING

 

THE

 S

WITCH

3Com’s redundant power solution allows you to use any off-the-shelf 
-48V DC RPS that meets the requirements defined in Appendix C on 
page 127.

For an approved vendor list, more details about purchasing the 3Com 
recommended RPS, and a full set of requirements go to:

The 3Com recommended RPS generates -48V DC power using power 
supply units (or rectifiers). The outputs of the rectifier(s) are connected 
together so that you can increase the total -48V power available by 
adding rectifiers. For example, three 1500W rectifiers can provide up to 
4500W. Hot removal or insertion of a rectifier does not affect the -48V 
DC output voltage.

Table 14 shows an example of the total power available from several 
1500W rectifiers. 

Table 14   Power Availability

The unearthed -48V DC power distribution provides the mechanism to 
connect to the Switch 5500. The distribution consists of several circuit 
breakers and connection terminals for the positive (common) and 
negative -48V outputs. Individually connect each Switch 5500 to a circuit 
breaker terminal. 

You can also connect a battery to battery terminals prior to the DC power 
distribution to provide uninterrupted power and to be protected against 
the loss of AC mains power.

1500W

3000W

4500W

6000W

7500W

9000W

-

1500W

3000W

4500W

6000W

7500W

10014925-AD_S5500_GSG.book  Page 38  Thursday, August 16, 2007  12:29 PM