36
C
HAPTER
2: I
NSTALLING
THE
S
WITCH
Specifying the
Redundant Power
System
3Com’s redundant power solution allows the use of 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:
http://www.3Com.com/RPS
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 the total -48V power available can be increased by
adding additional rectifiers. For example, three 1500W rectifiers can
provide up to 4500W. Hot removal or insertion of a rectifier will not affect
the -48V DC output voltage.
Table 10
shows an example of the total power available from a number
of 1500W rectifiers.
A minimum of two rectifiers are required for each shelf to provide N+1
rectifier redundancy.
Table 10
Power Availability
The unearthed -48V DC power distribution provides the mechanism to
connect to the Switch 5500. The distribution consists of a number of
circuit breakers and connection terminals for the positive (common) and
negative -48V outputs. Each Switch 5500 must be individually connected
to a circuit breaker terminal.
A battery can also be connected to battery terminals prior to the DC
power distribution to provide uninterrupted power in order to protect
against the loss of AC mains power.
Rectifiers
1
2
3
4
5
6
No Rectifier
Redundancy
1500W
3000W
4500W
6000W
7500W
9000W
N+1 Rectifier
Redundancy
-
1500W
3000W
4500W
6000W
7500W
Summary of Contents for 3CR17251-91 - Switch 5500G-EI Stackable Gigabit...
Page 8: ......
Page 48: ...48 CHAPTER 2 INSTALLING THE SWITCH...
Page 70: ...70 CHAPTER 3 SETTING UP FOR MANAGEMENT...
Page 76: ...76 CHAPTER 4 CREATING AN XRN STACKING FABRIC...
Page 84: ...84 CHAPTER 5 PROBLEM SOLVING...
Page 122: ...122 APPENDIX A SAFETY INFORMATION...
Page 126: ...126 APPENDIX B PIN OUTS...
Page 140: ...140 APPENDIX C TECHNICAL SPECIFICATIONS...
Page 148: ......