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In switches that support power supplies of different capacities, if you change your existing
power supply to a lower-capacity power supply, the PoE power budget might no longer
be sufficient to power all the PoE ports on the switch. If your switch supports redundant
power supplies and you have installed power supplies of different capacities, the PoE
power budget is based on the wattage of the lower-capacity power supply. The number
of PoE ports on the switch cannot be increased by installing a larger power supply.
You can display the PoE power budget for your switch by using the
command.
Power Management Mode
J-EX Series switches support two power management modes: class and static. The mode
you configure for your switch determines how the maximum power for a PoE interface
is derived and how power is allocated to the PoE interfaces:
•
Class mode—In this mode, the maximum power for an interface is determined by the
class of connected powered device. Table 395 on page 3010 lists the classes of powered
devices and associated power levels.
Table 395: Class of Powered Device and Power Levels
Power Range of Powered
Device
Maximum Power
Delivered by PoE Port
Class
Standard
0.44 through 12.95 W
15.4 W
0
IEEE 802.3af (PoE)
0.44 through 3.84 W
4.0 W
1
3.84 through 6.49 W
7.0 W
2
6.49 through 12.95 W
15.4 W
3
The powered device communicates to the PoE controller which class it belongs to
when it is connected. The PoE controller then allocates to the interface the maximum
power required by the class (see Table 395 on page 3010). It does not allocate power to
an interface until a powered device is connected. Class 0 is the default class for powered
devices that do not provide class information.
•
Static mode—In this mode, you specify the maximum power for each PoE interface.
The PoE controller then allocates this amount of power to the interface from its total
budget. For example, if you specify a maximum value of 8.0 W for
ge-/0/0/3
, the PoE
controller allocates 8.0 W out of its total power budget for the interface. This amount
is allocated to the interface whether or not a powered device is connected to the
interface or whether the connected powered device uses less power than 8.0 W.
For switches that support IEEE 802.3af (PoE), the maximum power permitted on any
interface is 15.4 W. This wattage guarantees that, after line loss, the powered device
receives 12.95 W, which is the maximum required by 802.3af-compliant powered
devices.
In both class and static mode, if the power consumption of a powered device exceeds
the maximum power allocated to the interface, power to the interface is turned off.
3010
Dell PowerConnect J-Series Ethernet Switch Complete Software Guide for Junos OS
Summary of Contents for PowerConnect J-EX8208
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Page 383: ...CHAPTER 21 Configuration Statements for Power Management 311 ...
Page 387: ...CHAPTER 22 Operational Mode Commands for Power Management 315 ...
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Page 505: ...CHAPTER 33 Operational Mode Commands for User and Access Management 433 ...
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Page 581: ...CHAPTER 38 Operational Mode Commands for System Services 509 ...
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Page 631: ...CHAPTER 41 Configuration Statements for System Monitoring 559 ...
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Page 683: ...CHAPTER 42 Operational Mode Commands for System Monitoring 611 ...
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Page 907: ...CHAPTER 49 Operational Mode Commands for Virtual Chassis 835 ...
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Page 1061: ...CHAPTER 56 Operational Mode Commands for Interfaces 989 ...
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Page 1297: ...CHAPTER 63 Operational Mode Commands for Bridging and VLANs 1225 ...
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Page 1461: ...CHAPTER 69 Operational Mode Commands for Spanning Tree Protocols 1389 ...
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Page 1819: ...CHAPTER 74 Operational Commands for Layer 3 Protocols 1747 ...
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Page 2215: ...CHAPTER 80 Operational Mode Commands for IGMP Snooping and Multicast 2143 ...
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Page 2341: ...Figure 49 Topology for Configuration 2269 Chapter 82 Examples Access Control Configuration ...
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Page 2537: ...CHAPTER 86 Operational Commands for 802 1X 2465 ...
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Page 2607: ...CHAPTER 92 Operational Mode Commands for Rate Limiting 2535 ...
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Page 2777: ...CHAPTER 99 Operational Mode Commands for Port Security 2705 ...
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Page 2907: ...CHAPTER 106 Operational Mode Commands for Firewall Filters 2835 ...
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Page 3049: ...CHAPTER 112 Operational Mode Commands for CoS 2977 ...
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Page 3117: ...CHAPTER 119 Operational Mode Commands for PoE 3045 ...
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Page 3211: ...CHAPTER 125 Operational Mode Commands for MPLS 3139 ...
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Page 3603: ...CHAPTER 134 Operational Mode Commands for General Network Management and Monitoring 3531 ...
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