Poe Power Budget And Ac Power Supplies - Juniper EX4200 Hardware Manual

The DC power supply for the switch is available in a 190 W model, with dual input feeds for power resiliency
(see Figure 19 on page 50).
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
Figure 19 on page
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 "DC Power Wiring Sequence Warning" on page 307
Safety Guidelines" on page
Figure 19: DC Power Supply
To avoid electrical injury, follow instructions in Installing a Power Supply in an EX3200 Switch and Removing
a Power Supply from an EX3200 Switch or
"Removing a Power Supply from an EX4200 Switch" on page 195

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
EX4200 switches, the capacity of the power supply provided with a PoE model is sufficient to supply each
50) for connecting DC power source cables labeled positive (+) and negative (–).
302.
"Installing a Power Supply in an EX4200 Switch" on page 197
and "DC Power Electrical
carefully.
50
or