Nortel Networks 8000 Series - Manual (Page 25)

8000 Series DC power supplies 25
Installing a DC Power Supply in an Ethernet Routing Switch 8000 Series Chassis
Ethernet Routing Switch 8600 Chassis” in Installing and Maintaining the
Ethernet Routing Switch 8600 Chassis.
2 Refer to the output power rating of the 8005DC power supply based on the
input connection. See
Appendix A, “Technical specifications for the DC
Power Supply,” on page 57 .
If either the individual or combined power requirements for the components
exceeds the power supply rating, you need to add at least one more power
supply to your configuration.
3 Consider your redundant power supply needs. If one power supply satisfies
your system power consumption needs, a second power supply provides
redundancy. If two power supplies satisfy your system power consumption
needs, a third power supply provides redundancy.
Redundant power configuration
If a chassis has a redundant power configuration and one power supply fails, the
chassis continues to operate with no interruption of service. The chassis will
continue to supply the same module output power with the remaining power
supplies. A trap and syslog message will indicate that the configuration is
non-redundant. Nortel recommends that you operate the Ethernet Routing Switch
8600 system in a redundant configuration at all times to ensure maximum network
up time.
If a chassis has the minimum power supply configuration and one power supply
fails, the system loses power and network connectivity.
Note: Nortel recommends that you install each power supply on its own
dedicated branch circuit. This ensures that a fault on another branch
circuit doesn’t cascade onto other branch circuits.
A redundant power supply provides protection against the failure of
another power supply in the system.