Juniper PTX3000 Hardware Manual page 33

Figure 15: DC Power Supply in an Optical ILA
1 Handle
—
2 DC terminal
—
Each of the two 150-W power supplies has a single DC input. The power supply provides 12 VDC output
with a standby voltage of 12 VDC. An optical ILA has twice the number of power supplies needed to power
all of the components in the device, which is known as 1+1 redundancy. When the optical ILA has both
power supplies installed and connected to power, the device has full power redundancy. If a power supply
fails or is removed, the other or second power supply balances the electrical load without interruption.
The fans in the power supply provide front-to-back airflow, which is also known as airflow out (AFO).
CAUTION:
Power to an Optical ILA" on page
page 97, and
NOTE: We recommend that the 48-VDC facility DC source be equipped with a circuit protector
rated at 10 A (–48 VDC) minimum, or as required by local code.
NOTE: We recommend that the 60-VDC facility DC source be equipped with a circuit protector
rated at 5 A (–60 VDC) minimum, or as required by local code.
NOTE: For more information about power system redundancy, see
Component Overview" on page
To avoid electrical injury, carefully follow instructions in
66,
"Removing a Power Supply from an Optical ILA" on page
19.
3 Ejector lever
—
"Installing a Power Supply in an Optical ILA" on
"Optical ILA Hardware
"Connecting DC
95.
33