Dell PowerConnect J-EX4200 Hardware Guide - Page 39

PoE Power Budget and AC Power Supplies, Table 13: Minimum Power Requirements for a J-EX4200 Switch - 48t

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Chapter 2: Component Descriptions NOTE: After powering on a J-EX4200 switch, wait for at least 60 seconds before powering it off. After powering off a J-EX4200 switch, wait for at least 60 seconds before powering it back on. After a switch has been powered on, it can take up to 60 seconds for status indicators-such as LEDs on the power supply, show chassis command output, and messages on the LCD-to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds. PoE Power Budget and AC Power Supplies The PoE power budget for a PoE switch model is determined by the capacity of its power supply. For a J-EX4200 switch, the capacity of the power supply provided with the switch is sufficient to supply each PoE-capable port with up to 15.4 W in compliance with the IEEE 802.3af PoE standard. Table 13 on page 23 lists the J-EX4200 power supply ratings and associated PoE power budgets. Starting with Junos OS Release 11.1, a J-EX Series Ethernet switch supports enhanced PoE, a Juniper Networks extension to the IEEE 302.3af PoE standard. Enhanced PoE permits up to 18.6 W per PoE port. Because the power supply provided with a switch is designed to supply a maximum of 15.4 W per PoE port, if you connect a powered device that draws more than 15.4 W, the PoE power budget might not be sufficient to supply a full 15.4 W to the remaining PoE ports. NOTE: To enable enhanced PoE support, switches upgraded to Junos OS Release 11.1 from a previous release require a separate upgrade of the PoE controller software. Table 13: Minimum Power Requirements for a J-EX4200 Switch Model Number Number of PoE-enabled Ports Minimum Power Requirement J-EX4200-24T 8 320 W J-EX4200-48T 8 320 W J-EX4200-24F - 320 W Related • AC Power Cord Specifications for J-EX4200 Switches on page 71 Documentation • AC Power Supply LEDs in J-EX4200 Switches on page 24 • Rear Panel of a J-EX4200 Switch on page 7 • Field-Replaceable Units in J-EX4200 Switches on page 16 • Power Specifications for J-EX4200 Switches on page 71 23

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NOTE:
After powering on a J-EX4200 switch, wait for at least 60 seconds
before powering it off. After powering off a J-EX4200 switch, wait for at least
60 seconds before powering it back on.
After a switch has been powered on, it can take up to 60 seconds for status
indicators—such as LEDs on the power supply,
show chassis
command output,
and messages on the LCD—to indicate that the power supply is functioning
normally. Ignore error indicators that appear during the first 60 seconds.
PoE Power Budget and AC Power Supplies
The PoE power budget for a PoE switch model is determined by the capacity of its power
supply. For a J-EX4200 switch, the capacity of the power supply provided with the switch
is sufficient to supply each PoE-capable port with up to 15.4 W in compliance with the
IEEE 802.3af PoE standard.
Table 13 on page 23 lists the J-EX4200 power supply ratings and associated PoE power
budgets.
Starting with Junos OS Release 11.1, a J-EX Series Ethernet switch supports enhanced
PoE, a Juniper Networks extension to the IEEE 302.3af PoE standard. Enhanced PoE
permits up to 18.6 W per PoE port. Because the power supply provided with a switch is
designed to supply a maximum of 15.4 W per PoE port, if you connect a powered device
that draws more than 15.4 W, the PoE power budget might not be sufficient to supply a
full 15.4 W to the remaining PoE ports.
NOTE:
To enable enhanced PoE support, switches upgraded to Junos OS
Release 11.1 from a previous release require a separate upgrade of the PoE
controller software.
Table 13: Minimum Power Requirements for a J-EX4200 Switch
Minimum Power Requirement
Number of PoE-enabled Ports
Model Number
320 W
8
J-EX4200-24T
320 W
8
J-EX4200-48T
320 W
–
J-EX4200-24F
Related
Documentation
AC Power Cord Specifications for J-EX4200 Switches on page 71
•
•
AC Power Supply LEDs in J-EX4200 Switches on page 24
•
Rear Panel of a J-EX4200 Switch on page 7
•
Field-Replaceable Units in J-EX4200 Switches on page 16
•
Power Specifications for J-EX4200 Switches on page 71
23
Chapter 2: Component Descriptions