Media Modules And Daughter Cards; Power Supplies - IBM Nways 8265 Product Description

Media Modules and Daughter Cards

Power Supplies

The media modules and daughter cards available for use with the 8265 switches are
described in the following chapter.
For detailed specifications of each component, refer to one of the following
appendixes:
Appendix B for technical specifications
•
Appendix C for power requirements.
•
A list of 8260 ATM modules that can be installed in the 8265 is given in Appendix D.
Up to four power supplies can be installed in the 8265.
The following types of power supply may be installed:
415 W AC (Feature Code 8027)
•
295 W DC (-48 V, Feature Code 8026)
•
Existing power supplies from an IBM 8260 (295 W and 415 W AC, or
•
295 W -48V DC).
The power supplies provide two main output voltages:
+ 12 volts, used by the 8265 components at power on time
•
+5.2 volts, used by the 8265 components during operation.
•
As a rule, it is recommended that you run the switch with at least one power supply
more than the minimum number needed to operate it. The minimum number of power
supplies is determined by the amount of power required (at +5.2 volts) to operate all of
the installed components.
The availability of extra power can help prevent the switch from shutting down when
modules demand more power than the switch can provide. An additional power
supply minimizes the chance that power supply redundancy will be lost without
warning.
For example, if the total power requirement of all installed modules is 350 watts
(at +5.2 volts), the switch can operate with only two power supplies. A third power
supply, however, is needed to achieve power fault tolerance. If you use three power
supplies and one power supply fails, the remaining two supplies can still support the
load.
Chapter 2. Features and Components
11