Power Supply in EX 3200 and EX 4200 Switches
The power supply in EX-series switches (see Figure 17 on page 28, Figure 18 on page
28 and Figure 19 on page 28) is a hot-removable and hot-insertable field-replaceable
unit (FRU) that can be installed on the rear panel. EX 4200 switches have an internal
redundant power supply, making the power supply in EX 4200 switches fully
redundant. The power supply in EX 3200 switches is not redundant. However, you
can connect an external power supply to an EX 3200 switch to provide redundancy.
EX-series 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 EX-series 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 inches. The power cord
retainer clips extend out of the power supply by 3 inches. The number of ports on
which PoE is enabled determines the minimum power requirements.
The DC power supply in EX 3200 and EX 4200 switches is available in a 190 W
model, with dual input feeds for power resiliency.You can install redundant DC power
supplies in an EX 4200 switch to achieve both power supply and power feed resiliency.
The DC power supply in EX 3200 and EX 4200 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 EX 3200 and EX 4200 switches has four terminals
labeled A+, A–, B+, and B– (see Figure 44 on page 82) for connecting DC power
source cables labeled positive (+) and negative (–). The DC power supplies for EX
3200 and EX 4200 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 3200 and
EX 4200 Switches” on page 159 and “DC Power Electrical Safety Guidelines for EX
3200 and EX 4200 Switches” on page 157.
Power Supply in EX 3200 and EX 4200 Switches ■ 27
Chapter 1: Switch Overview
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