Poe Power Budget And Ac Power Supplies; Figure 18: Dc Power Supply - Juniper EX3200 Hardware Manual

PoE Power Budget and AC Power Supplies

Copyright © 2016, Juniper Networks, Inc.
NOTE: The DC power supply in the switch does not support Power over
Ethernet (PoE); you can use either an external power injector or an AC power
supply to supply power to PoE devices that you connect to the switch.
NOTE: The DC power supply in the switch has four terminals labeled A+, B+,
A–, and B– (see
labeled positive (+) and negative (–). The DC power supplies are shipped
with jumpers from A+ input to B+ input tied together and jumpers from A–
input to B– input tied together.
NOTE: The A+ and B+ terminals are referred to as +RTN and A– and B–
terminals are referred to as –48 V in
on page 277 and
page 272.

Figure 18: DC Power Supply

To avoid electrical injury, follow instructions in
Switch" on page 191 and "Removing a Power Supply from an EX3200 Switch" on page 192
or Installing a Power Supply in an EX4200 Switch or Removing a Power Supply from an
EX4200 Switch carefully.
The PoE power budget for a PoE switch model is determined by the capacity of its power
supply. For EX3200 switches, the capacity of the power supply provided with a PoE
model is sufficient to supply each PoE-capable port with up to 15.4 W in compliance with
the IEEE 802.3af PoE standard.
their power supply ratings, and the associated PoE power budgets.
Starting with Junos OS Release 11.1, EX3200 switches support 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
Figure 18 on page 31) for connecting DC power source cables
"DC Power Wiring Sequence Warning"
"DC Power Electrical Safety Guidelines for Switches" on
"Installing a Power Supply in an EX3200
Table 12 on page 32 lists the EX3200 switch PoE models,
Chapter 4: Power Supplies
31