Juniper Networks EX4200 - Manual (Page 52)

Related Topics See Rear Panel of an EX3200 Switch on page 9 for port location. ■
■ See Rear Panel of an EX4200 Switch on page 11 for port location.
■ Connecting an EX Series Switch to a Network for Out-of-Band Management on
page 152
Power Supply in EX3200 and EX4200 Switches
The power supply in EX3200 and EX4200 switches (see Figure 17 on page 27, Figure
18 on page 27 and Figure 19 on page 27) is a hot-removable and hot-insertable
field-replaceable unit (FRU) that you can install on the rear panel without powering
off the switch or disrupting the switching function. EX4200 switches have an internal
redundant power supply, making the power supply in EX4200 switches fully
redundant. The power supply in EX3200 switches is not redundant.
EX3200 and EX4200 switches use power that provides two DC output voltages: 12 V
for system and logic power and 48–51 V (or higher, to compensate for voltage drops
along the path from the power supplies to the RJ-45 connector) for PoE ports.
The AC power supply in EX3200 and EX4200 switches is available in 320 W, 600 W,
and 930 W models. The exterior of the 600 W model is identical to that of the 930 W
model. The 320 W power supply is flush with the chassis. The 600 W power supply
and 930 W power supply extend out of the chassis by 2.25 in. The power cord retainer
clips extend out of the power supply by 3 in. The number of ports on which PoE is
enabled determines the minimum power requirements.
The DC power supply in EX3200 and EX4200 switches is available in a 190 W model,
with dual input feeds for power resiliency. You can install redundant DC power
supplies in an EX4200 switch to achieve both power supply and power feed resiliency.
NOTE: The DC power supply in EX3200 and EX4200 switches 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 EX3200 and EX4200 switches has four terminals
labeled A+, B+, A–, and B– (see Figure 19 on page 27) for connecting DC power
source cables labeled positive (+) and negative (–). The DC power supplies for EX3200
and EX4200 switches 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 for EX Series
Switches” on page 245 and “DC Power Electrical Safety Guidelines for EX Series
Switches” on page 241.
26 ■ Power Supply in EX3200 and EX4200 Switches
Complete Hardware Guide for EX3200 and EX4200 Ethernet Switches