RPS - Redundant power system.
Supports EX 2200, EX3300
As you noticed the EX2200 has one power supply.
The Same with the EX3300
To avoid it stopping to work with power loss etc.
The Juniper team offer you the option of sourcing an external RPS.
The setup will look like the image above with the RPS being backup power supply.
One RPS can power up to 6 switches : ex3300 and ex2200 switches.
The RPS can have up to three EX-PWR3-930-AC
The RPS port on the EX 2200 is covered with a metal cover, simply remove the screws.
The RPS ports on the RPS are also covered so simply remove the one you need.
Then connect an RPS cable.
The part numbers are
Chassis
EX-RPS-PWR
External Redundant power system(RPS) for power supply redundancy; includes one RPS cable and two power supply slot blank covers (power supply to be ordered separately)
or
EX-RPS-PWR-930-AC
External Redundant power system(RPS) for power supply redundancy; includes one RPS cable, two power supply slot blank covers and one 930W AC power supply
Power supplies - maximum of three
EX-PWR3-930-AC
930W AC Power Supply with PoE+ Capability for EX4200, EX3200 and EX-RPS-PWR-930-AC (Power Cord needs to be ordered separately)
For each power supply you must order a power cord. Pay attention.
Cables
Cable to connect the EX to the RPS. {The cable is 1.5 meters}
EX-RPS-CBL
RPS cable for EX3300 and EX2200 switches
Spares
Now, in case your client threw away his blank that covers the power supply and wants a replacement.
If your client wants he can rack mount the RPS using the same rack mounts as the switches.
EX-RPS-PWR-BLNK
Blank for RPS PSU slot (spare)
EX-RMK
EX-4PST-RMK
EX Series Rack Mount Kit
Adjustable 4-post rack-mount kit for EX and QFX5100
A RPS doesn't need a JCARE contract.