Dell PowerConnect J-8216, Руководство по оборудованию

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To calculate the number of power supplies required for your switch configuration:
1.
Determine the power requirement of the chassis—with the fan trays, RE modules, and
SF modules, but no line cards—by consulting Table 42 on page 89.
The watt values shown in Table 42 on page 89 are the amount of power reserved by
power management for the chassis in its power budget. It uses these values when
calculating used and available power and when determining whether sufficient power
exists to meet N, N+1, or N+N requirements.
When power management is configured for N+N power redundancy, it reserves less
power for the chassis so that more power is available for line cards.
Table 42: Power Reserved for the Chassis
Power Reserved for the Chassis
2400 W N+1 Configuration
1800 W N+N Configuration
NOTE: The amount of power that power management reserves for the
chassis is a set value that does not vary depending on chassis components
installed.
A J-EX8216 switch maintains chassis power when only one 2000 W power
supply is online even though 2000 W is less than the 2400 W reserved
for the chassis.
2.
To the power reserved for the chassis, add the power requirements of the line cards.
For line card power requirements, refer to “Power Requirements for J-EX8216 Switch
Components” on page 82.
For example, for a switch fully loaded with 8-port SFP+ line cards and using N+1 power
redundancy, the total power requirement:
= reserved chassis power + 16 (8–port SFP + line cards)
= 2400 W + 16 (450) W
= 2400 W + 7200 W
= 9600 W
For a switch fully loaded with 8-port SFP+ line cards, using N+N power redundancy,
the total power requirement:
= reserved chassis power + 16 (8–port SFP + line cards)
= 1800 W + 16 (450) W
= 1800 W + 7200 W
= 9000 W
89
Chapter 7: Planning Power Requirements