The Nexus 7000
and Nexus 7700 use power supplies with +90% power supply efficiency, reducing
power wasted as heat and reducing associated data center cooling requirements.
The switches offer different types of redundancy modes. They offer visibility
into the actual power consumption of the total system, as well as modules
enabling accurate power consumption monitoring, for the right sizing of power
supplies, UPSs, and environmental cooling. Variable-speed fans adjust
dynamically to lower power consumption and optimize system cooling for true
load.
- Power redundancy: Multiple system-level options for maximum data center availability.
- Fully hot-swappable: Continuous system operations; no downtime in replacing power supplies.
- Internal fault monitoring: Detects component defect and shuts down unit.
- Temperature measurement: Prevents damage due to overheating (every ASIC on the board has a temperature sensor).
- Real-time power draw: Shows real-time power consumption.
- Variable fan speed: Automatically adjusts to changing thermal characteristics; lower fan speeds use lower power.
Cisco Nexus
7000 and Nexus 7700 Series 3.0kW AC Power Supply Module
The 3.0kW AC
power supply shown in Figure 1-30 is designed only for the Nexus 7004
chassis and is used across all the Nexus 7700 Series chassis. It is a single
20-ampere (A) AC input power supply. When connecting to high line nominal
voltage (220 VAC) it will produce a power output of 3000W; connecting to low
line nominal voltage (110 VAC) will produce a power output of 1400W.
Figure 1-30 Cisco Nexus 7000 3.0kW AC Power Supply
NOTE: Although the Nexus 7700
chassis and the Nexus 7004 use a common power supply architecture, different
PIDs are used on each platform. Therefore, if you interchange the power
supplies, the system will log an error complaining about the wrong power supply
in the system; although technically this might work, it is not officially
supported by Cisco.
Cisco Nexus
7000 and Nexus 7700 Series 3.0kW DC Power Supply Module
The 3.0kW DC
power supply shown in Figure 1-31 is
designed only for the Nexus 7004 chassis and is used across all the Nexus 7700
Series chassis. The Nexus 3.0kW DC power supply has two isolated input stages,
each delivering up to 1500W of output power. Each stage uses a –48V DC
connection. The unit will deliver 1551W when only one input is active and 3051W
when two inputs are active.
Figure 1-31 Cisco Nexus 7000 3.0kW DC Power Supply
Cisco Nexus
7000 Series 6.0kW and 7.5kW AC Power Supply Modules
The 6.0kW and
7.5kW power supplies shown in Figure
1-32 are common across Nexus 7009, 7010, and 7018. They allow
mixed-mode AC and DC operation, enabling migration without disruption and
providing support for dual environments with unreliable AC power, with battery
backup capability.
Figure 1-32 Cisco Nexus 7000 6.0kW and 7.5kW Power Supplies
Table 1-10 shows
the specifications of both power supplies with different numbers of inputs and
input types.
Table 1-10
Nexus 7000 and Nexus 7700 6.0kW and 7.5kW Power Supply Specifications
|
Power
Supply Type
|
Number of
Inputs
|
Input Power
|
Output
|
|
6.0kW
|
Single input
|
220V
|
3000W
|
|
110V
|
1200W
|
||
|
Dual input
|
220V
|
6000W
|
|
|
110V
|
2400W
|
||
|
Dual input
|
110 and 220V
|
4200W
|
|
|
7.5kW
|
Single input
|
220V
|
3750W
|
|
Dual input
|
220V
|
7500W
|
Cisco Nexus
7000 Series 6.0kW DC Power Supply Module
The 6kW DC power
supply shown in Figure 1-33 is
common to the 7009, 7010, and 7018 systems. The 6kW has four isolated input
stages, each delivering up to 1500W of power (6000W total on full load) with
peak efficiency of 91% (high for a DC power supply). The power supply can be
used in combination with AC units or as an all DC setup. It supports the same
operational characteristics as the AC units:
- Redundancy modes (N+1 and N+N)
- Real-time power—actual power levels
- Single input mode (3000W)
- Online insertion and removal
- Integrated lock and On/Off switch (for easy removal)
Figure 1-33 Cisco Nexus 7000 6.0kW DC Power Supply
Multiple power
redundancy modes can be configured by the user:
- Combined mode, where the total power available is the sum of the outputs of all the power supplies installed. (This is not redundant.)
- PSU redundancy, where the total power available is the sum of all power supplies minus one, otherwise commonly called N+1 redundancy.
- Grid redundancy, where the total power available is the sum of the power from only one input on each PSU. Each PSU has two supply inputs, allowing them to be connected to separate isolated A/C supplies. In the event of an A/C supply failure, 50% of power is secure.
- Full redundancy, which is the combination of PSU redundancy and grid redundancy. You can lose one power supply or one grid; in most cases this will be the same as grid redundancy.
Full redundancy
provides the highest level of redundancy, so it is recommended. However, it is
always better to choose the mode of power supply operation based on the
requirements and needs.
An example of
each mode is shown in Figure 1-34.
Figure 1-34 Nexus 6.0kW Power Redundancy Modes
To help with
planning for the power requirements, Cisco has made a power calculator that can
be used as a starting point. It is worth mentioning that the power calculator
cannot be taken as a final power recommendation.
The power
calculator can be found at http://www.cisco.com/go/powercalculator.
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Thanks for sharing poe switches
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